Past Quantum Lunches

13 Jan. 2021, 12:00-13:00

ON-LINE QLunch: Ian Jauslin

Speaker: Ian Jauslin from Princeton University

6 Jan. 2021, 12:00-13:00

ON-LINE QLunch: Ion Nechita

Speaker: Ion Nechita

16 Dec. 2020, 12:00-13:00

ON-LINE QLunch: Fault-tolerant coding for quantum communication

Speaker: Alexander Müller-Hermes from Université de Lyon I

9 Dec. 2020, 12:00-13:00

ON-LINE QLunch: Petar Popovski

Speaker: Petar Popovski from AAU

2 Dec. 2020, 12:00-13:00

ON-LINE QLunch: Meng Yang

Speaker: Meng Yang from QMATH

25 Nov. 2020, 12:00-13:00

ON-LINE QLunch: Andreas Bluhm

Speaker: Andreas Bluhm from QMATH

18 Nov. 2020, 12:00-13:00

ON-LINE QLunch: Daniel Stilck and Christoph Hirche

Speakers: Daniel Stilck and Christoph Hirche from QMATH

11 Nov. 2020, 12:00-13:00

ON-LINE QLunch: Vladimir Lysikov

Speaker: Vladimir Lysikov from QMATH

4 Nov. 2020, 12:00-13:00

ON-LINE QLunch: Morten Kjaergaard

Speaker: Morten Kjaergaard from NBI

28 Oct. 2020, 12:00-13:00

ON-LINE QLunch: Alvin Moon

Speaker: Alvin Moon from QMATH

21 Oct. 2020, 12:00-13:00

QLunch: Christian Majenz

Speaker: Christian Majenz from QuSoft

30 Sept. 2020, 12:00-13:00

QLunch: Daniel Stilck França

Speaker: Daniel Stilck França from QMATH

25 Sept. 2020, 13:00-14:00

QLunch: Nicholas Gauguin Houghton-Larsen

Speaker: Nicholas Gauguin Houghton-Larsen from QMATH

18 Sept. 2020, 13:00-14:00

QLunch: Marie Fialová

Speaker: Marie Fialová from QMATH

11 Sept. 2020, 13:00-14:00

QLunch:Bergfinnur Durhuus

Speaker: Bergfinnur Durhuus from QMATH

4 Sept. 2020, 13:00-14:00

QLunch: Frederik Ravn Klausen

Speaker: Frederik Ravn Klausen from QMATH

31 Aug. 2020, 15:00-16:00

QMATH Seminar: Jens Hoppe

Speaker: Jens Hoppe

26 Aug. 2020, 12:00-13:00

QLunch: Sigurd Storgaard

Speaker: Sigurd Storgaard

19 Aug. 2020, 12:00-13:00

QLunch: Daniel Stilck França

Speaker: Daniel Stick França from QMATH

1 July 2020, 12:00-13:00

QLunch: Efficient simulation of random states and random unitaries

Speaker: Christian Majenz from QuSoft

17 June 2020, 12:00-13:00

ON-LINE QLunch: Thor Gabelgaard Nielsen

Speaker: Thor Gabelgaard Nielsen

10 June 2020, 12:00-13:00

ON-LINE QLunch: Peter Harremoes

Speaker: Peter Harremoes

3 June 2020, 12:00-13:00

ON-LINE QLunch: Tommaso Guaita

Speaker: Tommaso Guaita, The Max Planck Institute of Quantum Optics

27 May 2020, 12:00-13:00

ON-LINE QLunch: Christopher Cedzich

Speaker: Christopher Cedzich, Leibniz Universität Hannover

20 May 2020, 12:00-13:00

ON-LINE QLunch: Jørgen Rasmussen

Speaker: Jørgen Rasmussen, University of Queensland

13 May 2020, 12:00-13:00

ON-LINE QLunch: Finite group velocity implies quasi-locality of interactions

Speaker: Henrik Wilming, ETH Zürich

6 May 2020, 12:00-13:00

ON-LINE QLunch: Péter Vrana

Speaker: Péter Vrana, Budapest University of Technology and Economics

29 Apr. 2020, 12:00-13:00

ON-LINE QLunch: Niels Benedikter

Speaker: Niels Benedikter

22 Apr. 2020, 12:00-13:00

ON-LINE QLunch: Torben Krüger

Speaker: Torben Krüger

15 Apr. 2020, 12:00-13:00

ON-LINE QLunch: Jan Philip Solovej

Speaker: Jan Philip Solovej

8 Apr. 2020, 12:00-13:00

CANCELLED ON-LINE QLunch: Jørgen Rasmussen

Speaker: Jørgen Rasmussen, University of Queensland

1 Apr. 2020, 12:00-13:00

ON-LINE QLunch: Andreas Bluhm

Speaker: Andreas Bluhm

25 Mar. 2020, 12:00-13:00

ON-LINE Lunch: Jitendra Prakash

Speaker: Jitendra Prakash

11 Mar. 2020, 12:00-13:00

QLunch: MIP* = RE (video)

Speaker: Henry Yuen

4 Mar. 2020, 12:00-13:00

QLunch: Nika Akopian

Speaker: Nika Akopian from DTU

26 Feb. 2020, 12:00-13:00

QLunch with Amanda Young

Ttiel: A Non-Vanishing Spectral Gap for a 1/3-Filled Fractional Quantum Hall Spin ChainSpeaker: Amanda Young from TUM

19 Feb. 2020, 12:00-13:00

QLunch: The catalytic entropy conjecture

Speaker: Henrik Wilming, ETH Zurich

12 Feb. 2020, 12:00-13:00

QLunch with Cambyse Rouzé

Approximate tensorization of the relative entropy for noncommuting conditional expectations

5 Feb. 2020, 12:00-13:00

QLunch with Yinan Li

Title: The Haemers Bound of Graphs and Noncommutative Graphs, and Quantum Shannon Capacities

29 Jan. 2020, 12:00-13:00

QLunch: Entanglement renormalization and wavelet theory

Speaker: Freek Witteveen from QuSoft

22 Jan. 2020, 12:00-13:00

QLunch: Quantum Photonics for AI and AI for Quantum Photonics

Speaker: Jacques Carolan from NBI

15 Jan. 2020, 12:00-13:00

QLunch: Nodal Sets of Random Spherical Harmonics

Speaker: Mikhail Sodin, Tel Aviv University

8 Jan. 2020, 12:00-13:00

QLunch: Tensor network representations from the geometry of entangled states

Speaker: Matthias Christandl from QMATH

18 Dec. 2019, 12:00-13:00

QLunch: Distributed quantum sensing in a CV network

Speaker: Johannes Borregaard from QMATH

4 Dec. 2019, 12:00-13:00

QLunch: Structure from Non-Signalling

Speaker: Nicholas Gauguin Houghton-Larsen from QMATH

27 Nov. 2019, 12:00-13:00

QLunch: Quantum isomorphism is equivalent to equality of homomorphism counts from planar graphs

Speaker: David Roberson from DTU

20 Nov. 2019, 12:00-13:00

QLunch: The effect of noise in boson sampling

Speaker: Raúl Garcia-Patron, Université Libre de Bruxelles

13 Nov. 2019, 12:00-13:00

QLunch:The Dilute Limit of Interacting Bose Gases

Speaker: Jan Philip Solovej from QMATH

6 Nov. 2019, 12:00-13:00

QLunch:Varieties of sum of powers, Stiefel manifolds and their degrees

Speaker: Fulvio Gesmundo from QMATH

23 Oct. 2019, 12:00-13:00

QLunch: Is there such a thing as private information?

Speaker: Charles Bennett from IBM Research

16 Oct. 2019, 12:00-13:00

QLunch: Faster quantum and classical SDP approximations for quadratic binary optimization

Speaker: Daniel Stilck França from QMATH

9 Oct. 2019, 12:00-13:00

QLunch: Dyonic zero-energy modes

Speaker: Michele Burrello from NBI

2 Oct. 2019, 12:00-13:00

QLunch: Quantum correlations under restricted transfer of information

Speaker: Jonatan Bohr Brask from DTU

25 Sept. 2019, 12:00-13:00

QLunch: Recent results on Quantum Channel Discrimination

Speaker: Christoph Hirche from QMATH

18 Sept. 2019, 12:00-13:00

QLunch: Compatibility of quantum measurements and inclusion constants for free spectrahedra

Speaker: Andreas Bluhm from QMATH

11 Sept. 2019, 12:00-13:00

QLunch: Negative Wigner functions and Quantum Computing

Speaker: Göran Johansson from Chalmers University of Technology

4 Sept. 2019, 12:00-13:00

QLunch: On tensors of minimal border rank

Speaker: Vladimir Lysikov from QMATH

21 Aug. 2019, 12:00-13:00

QLunch: A polynomial-time algorithm for ground states of spin trees

Speaker: Nilin Abrahamsen from MIT

14 Aug. 2019, 12:00-13:00

QLunch: Preparation and Compression of Symmetric Pure Quantum States

Speaker: Andreas Baertschi, Los Alamos National Laboratory

3 July 2019, 12:00-13:00

QLunch: Exact correlation functions of the principal chiral model

Speaker: Peter Orland, Baruch College, CUNY.

12 June 2019, 12:00-13:00

QLunch: Nonlocal and nonabelian properties of Majorana bound states

Speaker: Karsten Flensberg from NBI

6 June 2019, 12:00-13:00

QLunch: Kac-Rice fixed point analysis for large complex systems

Speaker: Jesper Ipsen, University of Melbourne

29 May 2019, 12:00-13:00

QLunch: Hamiltonian Learning on Superconducting Qubits Using Bayesian Inference

Speaker: Natalie Pearson from ETH Zürich/NBI

22 May 2019, 12:00-13:00

QLunch: Blind Tomography via Compressed Sensing

Speaker: Ingo Roth, Freie Universität Berlin

8 May 2019, 12:00-13:00

QLunch: Old and New Results on State Transport

Speaker: Luc Vinet, CRM Montreal

2 May 2019, 12:00-13:00

QMATH-OpAlg Seminar: Computational complexity and the quantum value of non-local games

Speaker: William Slofstra, University of Waterloo (Department of Mathematics) and the Institute for Quantum Computing

24 Apr. 2019, 12:00-13:00

QLunch: A Quantum Kac Model

Speaker: Michael Loss, Georgia Institute of Technology

11 Apr. 2019, 15:00-16:00

QMATH Seminar: Generalized geometric Bogoliubov theory for the Bose-Hubbard model

Speaker: Lucas Hackl, the Max Planck Harvard Research Center for Quantum Optics

10 Apr. 2019, 12:00-13:00

QLunch: The Mysteries of Liouville Theory

Speaker: Antti Kupiainen, University of Helsinki

3 Apr. 2019, 12:00-13:00

QLunch: Faces of the Stabiliser Polytope and Robustness Measures

Speaker: Arne Heimendahl, Universität zu Köln

27 Mar. 2019, 12:00-13:00

QLunch: Towards understanding the algorithmic complexity of calculating the Ising partition function

Speaker: Martin Loebl, Charles University, Prague

20 Mar. 2019, 12:00-13:00

QLunch: The Quantum Information Bottleneck: Properties and Applications

Speaker: Christoph Hirche, Universitat Autonoma de Barcelona

13 Mar. 2019, 12:00-13:00

QLunch:Average mixing matrix of quantum walks

Speaker: Krystal Guo, Université libre de Bruxelles

6 Mar. 2019, 12:00-13:00

QLunch: Apolarity theory, Waring rank and partial derivatives

Speaker: Fulvio Gesmundo from QMATH

27 Feb. 2019, 12:00-13:00

QLunch:Fourier Expansion of the Fermion k-Body Reduction

Speaker: Robert Rauch, Technische Universität Braunschweig

20 Feb. 2019, 12:00-13:00

QLunch: Construction of Wannier functions for insulators and metals

Speaker: Antoine Levitt from Inria Paris

13 Feb. 2019, 12:00-13:00

QLunch: Propagators on curved spacetimes and balanced geometric Weyl quantization

Speaker: Jan Derezinski, University of Warszawa

6 Feb. 2019, 12:00-13:00

QLunch: From affine sl(2) to Virasoro

Speaker: Jørgen Rasmussen, University of Queensland

30 Jan. 2019, 12:00-13:00

QLunch: Decomposability of Linear Maps under Tensor Powers

Speaker: Alexander Müller-Hermes from QMATH

24 Jan. 2019, 14:15-15:15

GAMP/QMATH Seminar: Schmidt number of bipartite and multipartite states under local projections

Speaker: Yu Yang, Chongqing Technology and Business University

23 Jan. 2019, 12:00-13:00

QLunch: Summoning Quantum Information

Speaker: Ignacio Amores Sesar, University of Copenhagen

16 Jan. 2019, 12:00-13:00

QLunch: One-way quantum repeaters with photonic cluster states

Speaker: Johannes Borregaard from QMATH

9 Jan. 2019, 12:00-13:00

QLunch: An index theorem for quantum charge transport

Speaker: Alex Bols from KU Leuven

19 Dec. 2018, 12:00-13:00

QLunch:The Keyl-Werner theorem and the spin of a mean-field state

Speaker: Robin Reuvers from University of Cambridge

18 Dec. 2018, 13:00-14:00

QSeminar: Introduction to anyonic quantum gates II

Speaker: Claire Levaillant

17 Dec. 2018, 15:30-16:30

QSeminar: Introduction to anyonic quantum gates I

Speaker: Claire Levaillant

12 Dec. 2018, 12:00-13:00

QLunch: A quantum code for quantum homomorphic encryption and malleable quantum shared secrets

Speaker: Si-Hui Tan from Singapore University of Technology and Design and Visiting Guest Researcher at NBIA.

5 Dec. 2018, 12:00-13:00

QLunch: Lieb–Thirring inequalities and Weyl-type asymptotics for difference operators

Speaker: Lukas Schimmer from QMATH

28 Nov. 2018, 12:00-13:00

QLunch: Tree bijections for 2d Causal Triangulation

Speaker: John Wheater from University of Oxford

21 Nov. 2018, 12:00-13:00

QLunch: The structure of 3-dimensional causal triangulations

Speaker: Thordur Jonsson, University of Iceland

14 Nov. 2018, 12:00-13:00

QLunch: Non-closure of the set of quantum correlations

Speaker: Jitendra Prakash from QMATH

7 Nov. 2018, 12:00-13:00

QLunch: Optimal Upper Bound for the Correlation Energy of the Mean-Field Fermi Gas

Speaker: Niels Benedikter from IST Austria

31 Oct. 2018, 12:00-13:00

QLunch: Quantum ciphertext authentication and key recycling with the trap code

Speaker: Florian Speelman from CWI

24 Oct. 2018, 12:00-13:00

QLunch: Formulas of Szegő type for the periodic Schrödinger operator

Speaker: Bernhard Pfirsch from University College London

10 Oct. 2018, 12:00-13:00

QLunch: Non-closure of quantum correlation matrices and factorizable channels that require infinite dimensional ancilla

Speaker: Magdalena Musat

3 Oct. 2018, 12:00-13:00

QLunch: A simple 2nd order lower bound to the energy of dilute Bose gases

Speaker: Søren Fournais from Aarhus University

26 Sept. 2018, 12:00-13:00

QLunch: Entanglement of excited states

Speaker: Lucas Hackl

19 Sept. 2018, 12:00-13:00

QLunch: TBA

Speaker: Alexander Müller-Hermes from QMATH

12 Sept. 2018, 12:00-13:00

QLunch: Asymptotic port-based teleportation

Speaker: Christian Majenz from CWI

5 Sept. 2018, 12:00-13:00

QLunch: Constructing local frustration free Lindbladians with given MPDOs as stable space

Speaker: Dmytro Bondarenko from University of Hannover

19 July 2018, 14:15-15:15

GAMP/QMATH Lecture: Containment between LMI domains and the existence of quantum channels

Speaker: Adam Dor-On from Israel Institute of Technology

18 July 2018, 12:00-13:00

GAMP/QMATH Lecture: Generic Representations of quantum coordinate algebras

Speaker: H.C. Zhang Tsinghua University

13 June 2018, 12:00-13:00

QLunch: Quantum advantage of unitary Clifford circuits with magic state inputs

Speaker: Richard Jozsa, DAMTP, University of Cambridge UK

6 June 2018, 12:00-13:00

QLunch: On the construction of exponentially localized Wannier functions

Speaker: Horia Cornean from Aalborg University

30 May 2018, 12:00-13:00

QLunch: Quasi-factorization of the quantum relative entropy

Speaker: Angela Capel from Universidad Autónoma de Madrid

23 May 2018, 12:00-13:00

QLunch: : Multivariate operator means and the barycenter of relative entropy

Speaker: Frank Hansen from Tohoku University, Japan

17 May 2018, 15:15-16:00

GAMP/QMATH Seminar: Tsirelson's problems and the entanglement breaking rank

Speaker: Jitendra Prakash from University of Waterloo

16 May 2018, 12:00-13:00

QLunch:Dephrasure channel and superadditivity of coherent information

Speaker: Graeme Smith from University of Colorado

9 May 2018, 12:00-13:00

QLunch: The spectrum of asymptotic LOCC conversion

Speaker: Asger Kjærulff Jensen from QMATH

2 May 2018, 12:00-13:00

QLunch: Learning how to solve PDEs via the FEM.

Speaker: Anton Samojlow from QMATH

25 Apr. 2018, 12:00-13:00

QLunch: Distinguished self-adjoint extensions of operators with gaps

Speaker: Sabiha Tokus from QMATH

18 Apr. 2018, 12:00-13:00

QLunch: Searching faster using quantum walks

Speaker: Peter Høyer from University of Calgary

4 Apr. 2018, 12:00-13:00

QLunch: Schur-Weyl duality and entanglement

Speaker: Robin Reuvers from University of Cambridge

28 Mar. 2018, 12:00-13:00

QLunch: Entanglement Extraction, Energy and Einstein Equation

Speaker: Robert Jonsson from QMATH

21 Mar. 2018, 13:00-14:00

QLunch: Oddities of Quantum colorings

Speaker: Laura Mančinska from QMATH

14 Mar. 2018, 12:00-13:00

QLunch: The asymptotic spectrum

Speaker: Péter Vrana from Budapest University of Technology and Economics

7 Mar. 2018, 12:00-13:00

QLunch: On best rank-k approximations to tensors

Speaker: Jan Draisma from Universität Bern

28 Feb. 2018, 12:00-13:00

QLunch: Connes' embedding problem and quantum XOR games

Speaker: Samuel Harris, University of Waterloo

21 Feb. 2018, 12:00-13:00

QLunch: Quantum Flag Manifolds and Quantum Cluster Algebras

Speaker: Hans Plesner from the Department of Mathematical Sciences, KU

14 Feb. 2018, 12:00-13:00

QLunch: Quantum computing with Fibonacci anyons

Speaker: Claire Levaillant from University of California

7 Feb. 2018, 12:00-13:00

QLunch: Hardy-Lieb-Thirring Inequalities for Fractional Pauli Operators

Speaker: Gonzalo Bley from Aarhus University

31 Jan. 2018, 12:00-13:00

QLunch: A Note on Arbitrary Group Quantum-Secure PRPs

Speaker: Hector Bjoljahn Hougaard

17 Jan. 2018, 12:00-13:00

QLunch: Let G_2 be your friend

Speaker: Jørgen Rasmussen from University of Queensland

11 Jan. 2018, 15:15-16:15

GAMP/QMATH Lecture: Semidefinite Optimization for Quantum Information Processing

Speaker: Xin Wang from University of Technology Sydney

10 Jan. 2018, 12:00-13:00

QLunch: Topics in Quantum Entropy and Entanglement

Speaker: Elliott Lieb from Princeton University

20 Dec. 2017, 12:00-13:00

QLunch: Faces and orbits in invariant convex sets and cones

Speaker: Howard Barnum from QMATH

13 Dec. 2017, 12:00-13:00

QLunch: Strongly interacting quantum systems in one dimension

Speaker: Nikolaj Zinner from Aarhus University

6 Dec. 2017, 12:00-13:00

QLunch: Markovianizing cost of tripartite quantum states

Speaker: Eyuri Wakakuwa, University of Tokyo, Japan

29 Nov. 2017, 12:00-13:00

Quantum Lunch: Benchmarking purity and correlations for quantum states

Speaker: Bill Coish from McGill University

22 Nov. 2017, 12:00-13:00

QLunch: Communication games reveal preparation contextuality

Speaker: Armin Tavakoli from University of Geneva

15 Nov. 2017, 12:00-13:00

QLunch: Unforgeable quantum encryption

Speaker: Christian Majenz from Qusoft

1 Nov. 2017, 12:00-13:00

QLunch: On the interplay between algebraic geometry and complexity theory

Speaker: Fulvio Gesmundo from QMATH

25 Oct. 2017, 12:00-13:00

QLunch: Geometry of the quantum set of correlations

Speaker: Jed Kaniewski from QMATH

18 Oct. 2017, 12:00-13:00

QLunch: Spectral flow of magnetic knots

Speaker: Jérémy Sok from QMATH

11 Oct. 2017, 12:00-13:00

Quantum Lunch: The diatomic repulsion in reduced Hartree-Fock Theory

Speaker: Anton Samojlow from QMATH

4 Oct. 2017, 12:00-13:00

Quantum Lunch: Entanglement and Chaos: Linear entropy production at instabilities

Speaker: Lucas Hackl from Pennsylvania State University

27 Sept. 2017, 12:00-13:00

Quantum Lunch: The Lee-Huang-Yang Formula for Dilute Bose Gases

Speaker: Birger Brietzke from QMATH

13 Sept. 2017, 12:00-13:00

Quantum Lunch: Quantum Learning Algorithms

Speaker: Alexander Poremba from Heidelberg University

6 Sept. 2017, 12:00-13:00

QLunch: The Entropy Power Inequality with quantum memory

Speaker: Giacomo De Palma from QMATH

29 Aug. 2017, 12:00-13:00

QLunch Lecture: Entanglement for noisy channel coding

Speaker Omar Fawzi from ENT de Lyon

22 Aug. 2017, 15:00-16:00

QMATH Lecture: Lieb-Thirring inequality and gradient correction

Speaker: Phan Thanh Nam from LMU München

16 Aug. 2017, 12:00-13:00

QLunch: The excitation spectrum of Bose gases interacting through singular potentials

Speaker: Chiara Boccato from Universität Zürich

28 June 2017, 12:00-13:00

QLunch: On the stability of the quantum Darmois-Skitovich theorem

Speaker: Javier Cuesta, ‎Technische Universität München

22 June 2017, 14:00-15:00

QMATH Lecture: Logical paradoxes in deterministic quantum state injection

Speaker: Nadish de Silva, University College, London

21 June 2017, 12:00-13:00

Quantum Lunch: Peierls-Bogolyubov's inequality for deformed exponentials

Speaker: Frank Hansen from Tohoku University, Japan

20 June 2017, 14:00-15:00

QMATH/GAMP Lecture: Contextuality and Noncommuative Geometry in Quantum Mechanics

Speaker: Nadish de Silva, University College London

14 June 2017, 12:00-13:00

Quantum Lunch: General Error Correction for MERA Codes

Speaker: Francesco Battistel

7 June 2017, 12:00-13:00

QLunch: The Bernstein Theorem

Speaker: Francesco Chini from QMATH

31 May 2017, 12:00-13:00

Quantum Lunch: Topological Matter and Why You Should be Interested

Speaker: Steve Simon, University of Oxford, UK.

10 May 2017, 12:00-13:00

QLunch: Symmetry and Combinatorics for Identical Quantum Systems

Speaker: Nathan L. Harshman, American University (Washington, DC, USA) and Aarhus University

26 Apr. 2017, 12:00-13:00

Quantum Lunch: PEPS: Boundaries and spectral gap

Speaker: Angelo Lucia from QMATH

19 Apr. 2017, 12:00-13:00

QLunch: Quantum framework from simple physical principles for single systems

Speaker: Howard Barnum, University of Copenhagen and University of New Mexico

18 Apr. 2017, 13:00-14:00

QMATH Lecture: Asymptotic entanglement concentration of W states

Speaker: Alonso Botero, University of South Carolina, Columbia

5 Apr. 2017, 12:00-13:00

QLunch: Astronomical telescopes with quantum memories

Speaker: Johannes Borregaard from QMATH

29 Mar. 2017, 12:00-13:00

Quantum Lunch: Ultimate data hiding in quantum mechanics and beyond

Speaker: Ludovico Lami from Universitat Autònoma de Barcelona

22 Mar. 2017, 12:00-13:00

Quantum Lunch: On the oval conjecture

Speaker: Jérémy Sok from QMATH

15 Mar. 2017, 12:00-13:00

Quantum Lunch: Local boundary states imply gap for the parent Hamiltonian of PEPS

Speaker: Michael Kastoryano from Quantop

8 Mar. 2017, 12:00-13:00

Quantum Lunch: Solving linear systems of equations in logarithmic space: quantum versus classical algorithms

Speaker: Francois Le Gall from Kyoto University

1 Mar. 2017, 12:00-13:00

Quantum Lunch: Quantum simulations with noisy quantum computers

Kristan Temme from IBM

22 Feb. 2017, 12:00-13:00

Quantum Lunch: Ground states and excitations of homological codes

Speaker: Guest Professor Péter Vrana from QMATH

15 Feb. 2017, 12:00-13:00

Quantum Lunch: A Reformulation of the Dirac-Frenkel Principle and the Bogoliubov-de-Gennes equations

Speakers: Niels Benedikter and Jérémy Sok from QMATH

8 Feb. 2017, 12:00-13:00

QMATH/GAMP Lecture: Entropy accumulation

Speaker: Frédéric Dupuis from Masaryk University

3 Feb. 2017, 13:00-14:00

QMATH Lecture: On the dynamics of multi-component condensates: mixtures and spinors

Speaker: Alessandro Olgiati from SISSA Trieste

1 Feb. 2017, 12:00-13:00

Joint SYM and QMATH Lecture: Tsirelson's problem

Speaker: David Perez Garcia from Universidad Complutense de Madrid

25 Jan. 2017, 12:00-13:00

Quantum Lunch: The PPT^2 conjecture in dimension 3

Speaker: Alexander Müller-Hermes from QMATH

18 Jan. 2017, 12:00-13:00

Quantum Lunch: Feynman-Kac formulas for the ultra-violet renormalized Nelson model

Speaker: Oliver Matte

12 Jan. 2017, 15:15-16:15

Joint QMATH/GAMP Seminar: Limit shapes in statistical mechanics

Speaker: Professor Nicolai Reshetikhin from University of Berkeley

11 Jan. 2017, 12:00-13:00

Quantum Lunch: To what extent can information propagation decouple from energy propagation?

Speaker: Robert Jonsson, Chalmers Universitet Göteborg

4 Jan. 2017, 12:00-13:00

Quantum Lunch: Fun with diagram algebras

Speaker: Jørgen Rasmussen from University of Queensland

21 Dec. 2016, 12:00-13:00

Quantum Lunch: Quantum information on Jordan algebras

Speaker: Peter Harremoës

14 Dec. 2016, 12:00-13:00

Quantum Lunch: Self-testing of quantum states: how to identify which state Alice and Bob share by letting them play a (nonlocal) game

Speaker: Tim Coopmans from University of Amsterdam

7 Dec. 2016, 12:00-13:00

Quantum Lunch: Universality in interacting topological insulators

Speaker: Marcello Porta from University of Zurich

30 Nov. 2016, 12:00-13:00

Quantum Lunch: Instantaneous non-local quantum computation using the garden-hose model

Speaker: Florian Speelman from QMATH

23 Nov. 2016, 12:00-13:00

Quantum Lunch: Semi-device-independent quantum randomness generation

Speaker Jonatan Bohr Brask from University of Geneva

16 Nov. 2016, 12:00-13:00

Quantum Lunch: Marchenko--Pastur distributions and hypergeometric Hurwitz numbers

Speaker: Guest Professor Leonid Chekov from NBI

2 Nov. 2016, 12:00-13:00

Quantum Lunch: Nonabelian braiding by topological solitons

Speaker: Nuno M. Romão from University of Augsburg

26 Oct. 2016, 12:00-13:00

Quantum Lunch: Quantum optics meets superconducting qubits

Speaker: Professor Anders Søndberg Sørensen from NBI

19 Oct. 2016, 12:00-13:00

Quantum Lunch: Information-theoretic non-malleability and authentication

Speaker: Christian Majenz from QMATH

12 Oct. 2016, 12:00-13:00

Quantum Lunch: Picking holes and cutting corners to achieve Clifford gates with the surface code

Speaker: Benjamin James Brown from Quantop

28 Sept. 2016, 12:00-13:00

Quantum Lunch: Periodically driven impurity in the XX quantum spin chain

Speaker: Giuseppe Genovese from Universität Zurich.

21 Sept. 2016, 12:00-13:00

Quantum Lunch: Random tensor networks and multipartite entanglement

Speaker: Michael Walter

14 Sept. 2016, 12:00-13:00

Quantum Lunch: The martingale method meets the detectability lemma

Speaker: Angelo Lucia.

7 Sept. 2016, 12:00-13:00

Quantum Lunch: Schrödinger Operators in Some Curvature Problems

Speaker Niels Martin Møller

31 Aug. 2016, 12:00-13:00

Quantum Lunch: Disentangling entangled quantum states

Speaker: Sania Jevtic

24 Aug. 2016, 12:00-13:00

Quantum Lunch: Autonomous feedback for superconducting qubits

Speaker: Christian Kraglund Andersen from University of Aarhus

17 Aug. 2016, 12:00-13:00

Quantum Lunch:Tensor surgery and tensor rank

Speaker: Prof. Matthias Christandl from QMATH

10 Aug. 2016, 12:00-13:00

Quantum Lunch: An outsider's view on the mathematical foundations of machine learning

Speaker: Prof. Michael Wolf from Technical University of Munich.

3 Aug. 2016, 12:00-13:00

Quantum Lunch: Analytic and (nearly) optimal self-testing bounds for the Clauser-Holt-Shimony-Horne and Mermin inequalities

Speaker: Jedrzej Kaniewski, QMath.

6 July 2016, 12:00-13:00

Summer Quantum Lunch: Sandwiches and Sandwiched Renyi Divergences

Speaker: Alexander Gerd C Müller-Hermes, QMath.

29 June 2016, 12:00-13:00

Quantum Lunch: Reality of Temperley-Lieb Hamiltonian spectra

Speaker: Jørgen Rasmussen, University of Queensland.

22 June 2016, 12:00-13:00

Quantum Lunch: Quantum entropy derived from first principles

Speaker: Frank Hansen, IEHE Tohoku University.

15 June 2016, 12:00-13:00

Quantum Lunch: Quantum homomorphic encryption

Speaker: Yfke Dulek, University of Amsterdam.

8 June 2016, 12:00-13:00

Quantum Lunch: Vote Talk

Speaker: Mark Rudner, QDEV/NBIA.
Either: Berry curvature and a more beautiful classical mechanics.
Or: Survival, decay, and topological protection in non-Hermitian quantum transport.

1 June 2016, 12:00-13:00

Quantum Lunch: Introduction to fermionic observables

Speaker: Jakob Björnberg, QMath.

25 May 2016, 12:00-13:00

Quantum Lunch: Scalar Field Theories with Polynomial Shift Symmetries

Speaker: Kevin John Torres Grosvenor, NBI.
OBS: Aud 105, NOT 04.4.20.

18 May 2016, 12:00-13:00

Quantum Lunch: Landauer's principle and the energy cost of measurement

Speaker: David Reeb, Leibniz Universität Hannover.

11 May 2016, 14:00-15:00

After Quantum Lunch: Entropy power inequalities for qudits

Speaker: Māris Ozols, University of Cambridge.

11 May 2016, 12:00-13:00

Quantum Lunch: Stahl's Theorem

Speaker: Fabien Clivaz, University of Geneva.

4 May 2016, 12:00-13:00

Quantum Lunch: Quantum gate learning in engineered qubit networks: Toffoli gate with always-on interactions

Speaker: Leonardo Banchi, UCL.

27 Apr. 2016, 12:00-13:00

Quantum Lunch: Topological edge states are monogamous

Speaker: Konstantinos Meichanetzidis, Center for Topological Quantum Information (Leeds).

20 Apr. 2016, 12:00-13:00

Quantum Lunch: Geometry of random planar maps with high degrees

Speaker: Timothy Budd, NBI.

13 Apr. 2016, 12:00-13:00

Quantum Lunch: Color Codes are cool

Speaker: Benjamin James Brown.

6 Apr. 2016, 12:00-13:00

Quantum Lunch: Describing non-Markovian open quantum systems

Speaker: Jake Iles-Smith, DTU.

30 Mar. 2016, 12:00-13:00

Quantum Lunch: Key Distillation

Speaker: Roberto Ferrara.

23 Mar. 2016, 12:00-13:00

Quantum Lunch: Dirac operators with magnetic link

Speaker: Jeremy Sok.

16 Mar. 2016, 12:00-13:00

Quantum Lunch: Quantum many-body fluctuations around nonlinear Schrödinger dynamics

Speaker: Chiara Boccato, UZH.

9 Mar. 2016, 12:00-13:00

Quantum Lunch: Towards experimentally feasible unbounded violation of quantum steering inequality

Speaker: Magdalena Stobinska, University of Gdansk.

2 Mar. 2016, 12:00-13:00

Quantum Lunch: Tradeoff bounds for local error correction

Speaker: Michael Kastoryano, NBIA.

24 Feb. 2016, 12:00-13:00

Quantum Lunch: Pattern formation in biological systems & Electroweak baryogenesis in 2HDMs

Speaker: Nils Hermansson Truedsson, Dep. of Astronomy and Theoretical Physics, Lund University.

17 Feb. 2016, 12:00-13:00

Quantum Lunch: Device-independent two-party cryptography secure against sequential attacks.

Speaker: Jed Kaniewski (QMath), https://arxiv.org/abs/1601.06752

10 Feb. 2016, 12:00-13:00

Quantum Lunch: Trace inequalities for arbitrary many matrices via pinching

Speaker: Mario Berta, Caltech.

3 Feb. 2016, 12:00-13:00

Quantum Lunch: Tandem Talk

Speakers: Alexander Müller-Hermes and Roberto Ferrara .

27 Jan. 2016, 12:00-13:00

Quantum Lunch: Gaussian optimizers in quantum information

Speaker: Giacomo De Palma, NEST and CNR-NANO.

20 Jan. 2016, 12:00-13:00

Quantum Lunch: Topological States in Graphene

Speaker: Birger Brietzke.

13 Jan. 2016, 12:00-13:00

Quantum Lunch: A Pfaffian formula for monomer-dimer partition functions

Speaker: Ian Jauslin.

6 Jan. 2016, 12:00-13:00

Quantum Lunch: Determinism and causality. Which aspects are shared between classical physics and quantum physics?

Speaker: Peter Harremoes

16 Dec. 2015, 12:00-13:00

Quantum Lunch

Speaker: Chris Perry

Title: TBA

9 Dec. 2015, 12:00-13:00

Quantum Lunch: Variational Expressions for Quantum Relative Entropies

Speaker: Marco Tomamichel (Joint work with Mario Berta and Omar Fawzi.)

Abstract: Distance measures between quantum states like the trace distance and the fidelity can naturally be defined by optimizing a classical distance measure over all measurement statistics that can be obtained from the respective quantum states. In contrast, Petz showed that...

2 Dec. 2015, 12:00-13:00

Quantum Lunch

Speaker: Magnus Goffeng

Title: K-theory and topological insulators

Abstract: This will be an introductory seminar aimed at showing some basic facts in index theory and K-theory in the context of topological insulators.

25 Nov. 2015, 12:00-13:00

Quantum Lunch

Speaker: n.n.

Title: TBA

18 Nov. 2015, 12:00-13:00

Quantum Lunch

Speaker: Courtney Brell

Title: Error-correction in non-abelian anyon models

Abstract:

Scalable anyonic topological quantum computation requires the error-correction of non-abelian anyon systems. In contrast to abelian topological codes ...

11 Nov. 2015, 12:00-13:00

Quantum Lunch

Speaker: Ulrich Linden, University of Stuttgart

Title: On the Fermi Polaron in Two Dimensions

Abstract: We investigate the quantum system of a Fermi gas interacting
attractively with a single impurity by contact interaction in a
two-dimensional box. The contact interaction is implemented by a
limiting procedure ...

4 Nov. 2015, 12:00-13:00

Quantum Lunch: Extensions of the entanglement entropy for symmetry protected topological order

Title: Extensions of the entanglement entropy for symmetry protected topological order

Speaker: Shunji Matsuura

28 Oct. 2015, 12:00-13:00

Quantum Lunch: Interaction Effects in Spin-Wave Theory

Title: Interaction Effects in Spin-Wave Theory

Speaker: Niels Benedikter

21 Oct. 2015, 12:00-13:00

Quantum Lunch: Random permutations and the mean-field Heisenberg model

Title: Random permutations and the mean-field Heisenberg model

Speaker: Jakob Björnberg

14 Oct. 2015, 12:00-13:00

Quantum Lunch: Renormalising entanglement distillation

Speaker: Earl Campbell

Title: Renormalising entanglement distillation

7 Oct. 2015, 12:00-13:00

Quantum Lunch: Entanglement Measures

Title: Entanglement Measures

Speaker: Roberto Ferrara

30 Sept. 2015, 12:00-13:00

Quantum Lunch: Accurate atomic radii from Thomas-Fermi Theory

Title: Accurate atomic radii from Thomas-Fermi Theory

Speaker: Jan Philip Solovej

23 Sept. 2015, 12:00-13:00

Quantum Lunch: Bogoliubov correction to the mean-field dynamics of interacting bosons

Title: Bogoliubov correction to the mean-field dynamics of interacting bosons

Speaker: Marcin Napiórkowski

16 Sept. 2015, 12:00-13:00

Quantum Lunch: Quantum Circuits for Isometries

Title: Quantum Circuits for Isometries

Speaker: Raban Iten

Abstract: Every quantum operation can be decomposed into a sequence of single-qubit and Controlled-Not (C-NOT) gates. In many experimental architectures, single-qubit gates are relatively ‘cheap’ to perform compared to C-NOTs (for instance, being less susceptible to noise), and hence it is desirable to minimize the number of C-NOT gates required to implement a circuit. I will consider the task of constructing an arbitrary isometry from m qubits to n qubits, while trying to minimize the number of C-NOT gates required. I will show a lower bound and then give an explicit gate decomposition that gets within a factor of about two of this bound. Through Stinespring’s theorem this points to a C-NOT-efficient way to perform an arbitrary quantum operation.

9 Sept. 2015, 12:00-13:00

Quantum Lunch

Speaker: Douglas Lundholm

Title: Anyons in the average-field approximation

2 Sept. 2015, 12:00-13:00

Quantum Lunch: Non-binding of strongly coupled many-polarons in dimensions two and three

Title: Non-binding of strongly coupled many-polarons in dimensions two and three

Speaker: Anton Samojlow

19 Aug. 2015, 12:00-13:00

Quantum Lunch: Estimates for the lowest eigenvalue of magnetic Laplacians.

Title: Estimates for the lowest eigenvalue of magnetic Laplacians.

Speaker: Fabian Portmann

1 July 2015, 12:00-13:00

Quantum Lunch: Localization from superselection rules in translation invariant systems

Speaker: Isaac Kim

Abstract: We study a translation invariant spin model in a three-dimensional regular lattice, called the cubic code model, in the presence of arbitrary extensive perturbations. Below a critical perturbation strength, we show that most states with finite energy are localized; the overwhelming majority of such states have energy concentrated around a finite number of defects, and remain so for a time that is near-exponential in the distance between the defects. This phenomenon is due to an emergent superselection rule and does not require any disorder. This is joint a joint work with Jeongwan haah.(1505.01480)

24 June 2015, 12:00-13:00

Quantum Lunch: Bogoliubov theory at positive temperature

Speaker: Robin Reuvers

Abstract: I will discuss Bogoliubov theory in the translation invariant case of a Bose gas. The theory arises by restriction to translation invariant quasi-free states. I will introduce the positive temperature pressure functional and the corresponding ground state energy functional...

17 June 2015, 12:00-13:00

Quantum Lunch: Quantum-information processing with solid-state single-photon sources

Speaker: Peter Lohdal (NBI)

10 June 2015, 12:00-13:00

Quantum Lunch: The fractional Laplacian on bounded domains

Speaker: Gerd Grubb

3 June 2015, 12:00-13:00

Quantum Lunch: Learning and testing of mixed state spectra

Speaker: John Wright

Abstract:

An experiment produces an unknown mixed state, and you would like to learn some property of this state. How do you do this? The standard approach is to rerun the experiment multiple times and perform some measurement on the copies produced. The goal is then to learn or test the property using the smallest number of copies possible. In some cases, such as performing tomography on rank one pure states, researchers have designed algorithms which are optimal in their copy complexity. However, for many basic properties, including things as basic as estimating a mixed state's spectrum, this remains an open problem.

In this talk, we consider learning and testing properties which depend only on the mixed state's spectrum. Natural problems in this space include learning its spectrum, estimating its von Neumann entropy, or testing whether it is low rank. Our results include (i) a new upper bound for learning a mixed state's spectrum and (ii) an optimal algorithm for testing whether a mixed state is equal to the maximally mixed state. We use techniques from the asymptotic theory of the symmetric group; in particular, we rely on Kerov's algebra of observables to help us study the moments of random Young diagrams.

Joint work with Ryan O'Donnell.

20 May 2015, 12:00-13:00

Quantum Lunch: Defining work from operational principles

Speaker: Henrik Wilming

13 May 2015, 12:00-13:00

Quantum Lunch: An adaptive attack on Wiesner's quantum money

Speaker: Daniel Nagaj (Slovak Academy of Sciences)

Abstract:

Unlike classical money, which is hard to forge for practical reasons (e.g. producing paper with a certain property), quantum money is attractive because its security might be based on the no-cloning theorem. The first quantum money scheme was introduced by Wiesner circa 1970. Although more sophisticated quantum money schemes were proposed, Wiesner's scheme remained appealing because it is both conceptually clean and relatively easy to implement.

We show efficient adaptive attacks on Wiesner's quantum money scheme (and its variant by Bennett et al.), when valid money is accepted and passed on, while invalid money is destroyed. We propose two attacks, the first is inspired by the Elitzur-Vaidman bomb testing problem, while the second is based on the idea of protective measurements. It allows us to break Wiesner's scheme with 4 possible states per qubit, and generalizations which use more than 4 states per qubit.

6 May 2015, 12:00-13:00

Quantum Lunch: an introduction to Hypercontractivity and Log-Sobolev inequalities, and their applications in Mathematical Physics and Quantum Information

Speaker: Michael Kastoryano

29 Apr. 2015, 12:00-13:00

Quantum Lunch: Factorizable completely positive maps and Quantum Information Theory

Speaker: Magdalena Musat

Title: Factorizable completely positive maps and Quantum Information Theory

22 Apr. 2015, 12:00-13:00

Quantum Lunch: Energy Levels of Dipoles in Graphene

Title: Energy Levels of Dipoles in Graphene

Speaker: Simone Rademacher

15 Apr. 2015, 12:00-13:00

Quantum Lunch

Speaker: TBA

Title: TBA

8 Apr. 2015, 12:00-13:00

Quantum Lunch

Speaker: Min-Hsiu Hsieh

Title: A Classical Analog to Entanglement Reversibility

Abstract:

In this letter we introduce the problem of secrecy reversibility. This asks when two honest parties can distill secret bits from some tripartite distribution pXYZ and transform secret bits back into pXYZ at equal rates using local operation and public communication (LOPC). This is the classical analog to the well-studied problem of reversibly concentrating and diluting entanglement in a quantum state. We identify the structure of distributions possessing reversible secrecy when one of the honest parties holds a binary distribution, and it is possible that all reversible distributions have this form. These distributions are more general than what is obtained by simply constructing a classical analog to the family of quantum states known to have reversible entanglement. An indispensable tool used in our analysis is a conditional form of the G\'{a}cs-K\"{o}rner Common Information.

25 Mar. 2015, 12:00-13:00

Quantum Lunch: Two results in topology, motivated by quantum computation

Title: Two results in topology, motivated by quantum computation

Speaker: Gorjan Alagic

18 Mar. 2015, 12:00-13:00

Quantum Lunch

Speaker: Olga Bershtein

Title: TBA

11 Mar. 2015, 12:00-13:00

Quantum Lunch: Heralded quantum gate with integrated error detection

Speaker: Johannes Borregaard

4 Mar. 2015, 12:00-13:00

Quantum Lunch: Error distributions on large entangled states with non-Markovian dynamics

Speaker: Dara McCutcheon

25 Feb. 2015, 12:00-13:00

Quantum Lunch: A flea on Schrödinger's cat

Speaker: Robin Reuvers

18 Feb. 2015, 12:00-13:00

Quantum Lunch: Cryptography

Speaker: Gorjan Alagic

11 Feb. 2015, 12:00-13:00

Quantum Lunch: Ground state entanglement constrains low energy excitations

Speaker: Benjamin Brown

4 Feb. 2015, 12:00-13:00

Quantum Lunch

Title: Dynamical Mean-Field Theory of Fermionic Systems

Speaker: Niels Benedikter

28 Jan. 2015, 12:00-13:00

Quantum Lunch

Title: Capacities for quantum memories

Speaker: Alexander Mueller-Hermes

Abstract: Quantum memories can be regarded as quantum channels that transmit information through time without moving it through space. Aiming at a reliable storage of information we may thus not only encode at the beginning and decode at the end, but also intervene during the transmission - a possibility not captured by the ordinary capacities....

21 Jan. 2015, 12:00-13:00

Quantum Lunch

Title: A mean-field approximation of QED

Speaker: Jeremy Sok

14 Jan. 2015, 12:00-13:00

Quantum Lunch: Finding large gaps between tensor rank and border rank via algebras

Speaker: Jeroen Zuiddam

Abstract: In quantum information theory, it is well-known that the GHZ-state 000+111 cannot be (SLOCC-)transformed into the W-state 000+101+011, but the W-state can be approximated with states from the GHZ-orbit. The W-state is thus an example of a tensor of tensor rank 3 that can be approximated by tensors of tensor rank 2....


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ON-LINE QLunch: Ian Jauslin

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ON-LINE QLunch: Fault-tolerant coding for quantum communication

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CANCELLED ON-LINE QLunch: Jørgen Rasmussen

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QLunch: Is there such a thing as private information?

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QLunch: Kac-Rice fixed point analysis for large complex systems

QLunch: Hamiltonian Learning on Superconducting Qubits Using Bayesian Inference

QLunch: Blind Tomography via Compressed Sensing

QLunch: Old and New Results on State Transport

QMATH-OpAlg Seminar: Computational complexity and the quantum value of non-local games

QLunch: A Quantum Kac Model

QMATH Seminar: Generalized geometric Bogoliubov theory for the Bose-Hubbard model

QLunch: The Mysteries of Liouville Theory

QLunch: Faces of the Stabiliser Polytope and Robustness Measures

QLunch: Towards understanding the algorithmic complexity of calculating the Ising partition function

QLunch: The Quantum Information Bottleneck: Properties and Applications

QLunch:Average mixing matrix of quantum walks

QLunch: Apolarity theory, Waring rank and partial derivatives

QLunch:Fourier Expansion of the Fermion k-Body Reduction

QLunch: Construction of Wannier functions for insulators and metals

QLunch: Propagators on curved spacetimes and balanced geometric Weyl quantization

QLunch: From affine sl(2) to Virasoro