Past Quantum Lunches
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13 Jan. 2021, 12:00-13:00
ON-LINE QLunch: Ian Jauslin
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6 Jan. 2021, 12:00-13:00
ON-LINE QLunch: Ion Nechita
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16 Dec. 2020, 12:00-13:00
ON-LINE QLunch: Fault-tolerant coding for quantum communication
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9 Dec. 2020, 12:00-13:00
ON-LINE QLunch: Petar Popovski
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2 Dec. 2020, 12:00-13:00
ON-LINE QLunch: Meng Yang
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25 Nov. 2020, 12:00-13:00
ON-LINE QLunch: Andreas Bluhm
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18 Nov. 2020, 12:00-13:00
ON-LINE QLunch: Daniel Stilck and Christoph Hirche
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11 Nov. 2020, 12:00-13:00
ON-LINE QLunch: Vladimir Lysikov
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4 Nov. 2020, 12:00-13:00
ON-LINE QLunch: Morten Kjaergaard
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28 Oct. 2020, 12:00-13:00
ON-LINE QLunch: Alvin Moon
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21 Oct. 2020, 12:00-13:00
QLunch: Christian Majenz
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30 Sept. 2020, 12:00-13:00
QLunch: Daniel Stilck França
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25 Sept. 2020, 13:00-14:00
QLunch: Nicholas Gauguin Houghton-Larsen
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18 Sept. 2020, 13:00-14:00
QLunch: Marie Fialová
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11 Sept. 2020, 13:00-14:00
QLunch:Bergfinnur Durhuus
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4 Sept. 2020, 13:00-14:00
QLunch: Frederik Ravn Klausen
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31 Aug. 2020, 15:00-16:00
QMATH Seminar: Jens Hoppe
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26 Aug. 2020, 12:00-13:00
QLunch: Sigurd Storgaard
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19 Aug. 2020, 12:00-13:00
QLunch: Daniel Stilck França
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1 July 2020, 12:00-13:00
QLunch: Efficient simulation of random states and random unitaries
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17 June 2020, 12:00-13:00
ON-LINE QLunch: Thor Gabelgaard Nielsen
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10 June 2020, 12:00-13:00
ON-LINE QLunch: Peter Harremoes
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3 June 2020, 12:00-13:00
ON-LINE QLunch: Tommaso Guaita
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27 May 2020, 12:00-13:00
ON-LINE QLunch: Christopher Cedzich
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20 May 2020, 12:00-13:00
ON-LINE QLunch: Jørgen Rasmussen
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13 May 2020, 12:00-13:00
ON-LINE QLunch: Finite group velocity implies quasi-locality of interactions
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6 May 2020, 12:00-13:00
ON-LINE QLunch: Péter Vrana
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29 Apr. 2020, 12:00-13:00
ON-LINE QLunch: Niels Benedikter
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22 Apr. 2020, 12:00-13:00
ON-LINE QLunch: Torben Krüger
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15 Apr. 2020, 12:00-13:00
ON-LINE QLunch: Jan Philip Solovej
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8 Apr. 2020, 12:00-13:00
CANCELLED ON-LINE QLunch: Jørgen Rasmussen
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1 Apr. 2020, 12:00-13:00
ON-LINE QLunch: Andreas Bluhm
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25 Mar. 2020, 12:00-13:00
ON-LINE Lunch: Jitendra Prakash
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11 Mar. 2020, 12:00-13:00
QLunch: MIP* = RE (video)
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4 Mar. 2020, 12:00-13:00
QLunch: Nika Akopian
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26 Feb. 2020, 12:00-13:00
QLunch with Amanda Young
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19 Feb. 2020, 12:00-13:00
QLunch: The catalytic entropy conjecture
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12 Feb. 2020, 12:00-13:00
QLunch with Cambyse Rouzé
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5 Feb. 2020, 12:00-13:00
QLunch with Yinan Li
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29 Jan. 2020, 12:00-13:00
QLunch: Entanglement renormalization and wavelet theory
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22 Jan. 2020, 12:00-13:00
QLunch: Quantum Photonics for AI and AI for Quantum Photonics
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15 Jan. 2020, 12:00-13:00
QLunch: Nodal Sets of Random Spherical Harmonics
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8 Jan. 2020, 12:00-13:00
QLunch: Tensor network representations from the geometry of entangled states
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18 Dec. 2019, 12:00-13:00
QLunch: Distributed quantum sensing in a CV network
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4 Dec. 2019, 12:00-13:00
QLunch: Structure from Non-Signalling
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27 Nov. 2019, 12:00-13:00
QLunch: Quantum isomorphism is equivalent to equality of homomorphism counts from planar graphs
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20 Nov. 2019, 12:00-13:00
QLunch: The effect of noise in boson sampling
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13 Nov. 2019, 12:00-13:00
QLunch:The Dilute Limit of Interacting Bose Gases
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6 Nov. 2019, 12:00-13:00
QLunch:Varieties of sum of powers, Stiefel manifolds and their degrees
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23 Oct. 2019, 12:00-13:00
QLunch: Is there such a thing as private information?
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16 Oct. 2019, 12:00-13:00
QLunch: Faster quantum and classical SDP approximations for quadratic binary optimization
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9 Oct. 2019, 12:00-13:00
QLunch: Dyonic zero-energy modes
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2 Oct. 2019, 12:00-13:00
QLunch: Quantum correlations under restricted transfer of information
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25 Sept. 2019, 12:00-13:00
QLunch: Recent results on Quantum Channel Discrimination
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18 Sept. 2019, 12:00-13:00
QLunch: Compatibility of quantum measurements and inclusion constants for free spectrahedra
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11 Sept. 2019, 12:00-13:00
QLunch: Negative Wigner functions and Quantum Computing
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4 Sept. 2019, 12:00-13:00
QLunch: On tensors of minimal border rank
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21 Aug. 2019, 12:00-13:00
QLunch: A polynomial-time algorithm for ground states of spin trees
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14 Aug. 2019, 12:00-13:00
QLunch: Preparation and Compression of Symmetric Pure Quantum States
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3 July 2019, 12:00-13:00
QLunch: Exact correlation functions of the principal chiral model
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12 June 2019, 12:00-13:00
QLunch: Nonlocal and nonabelian properties of Majorana bound states
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6 June 2019, 12:00-13:00
QLunch: Kac-Rice fixed point analysis for large complex systems
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29 May 2019, 12:00-13:00
QLunch: Hamiltonian Learning on Superconducting Qubits Using Bayesian Inference
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22 May 2019, 12:00-13:00
QLunch: Blind Tomography via Compressed Sensing
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8 May 2019, 12:00-13:00
QLunch: Old and New Results on State Transport
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2 May 2019, 12:00-13:00
QMATH-OpAlg Seminar: Computational complexity and the quantum value of non-local games
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24 Apr. 2019, 12:00-13:00
QLunch: A Quantum Kac Model
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11 Apr. 2019, 15:00-16:00
QMATH Seminar: Generalized geometric Bogoliubov theory for the Bose-Hubbard model
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10 Apr. 2019, 12:00-13:00
QLunch: The Mysteries of Liouville Theory
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3 Apr. 2019, 12:00-13:00
QLunch: Faces of the Stabiliser Polytope and Robustness Measures
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27 Mar. 2019, 12:00-13:00
QLunch: Towards understanding the algorithmic complexity of calculating the Ising partition function
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20 Mar. 2019, 12:00-13:00
QLunch: The Quantum Information Bottleneck: Properties and Applications
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13 Mar. 2019, 12:00-13:00
QLunch:Average mixing matrix of quantum walks
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6 Mar. 2019, 12:00-13:00
QLunch: Apolarity theory, Waring rank and partial derivatives
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27 Feb. 2019, 12:00-13:00
QLunch:Fourier Expansion of the Fermion k-Body Reduction
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20 Feb. 2019, 12:00-13:00
QLunch: Construction of Wannier functions for insulators and metals
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13 Feb. 2019, 12:00-13:00
QLunch: Propagators on curved spacetimes and balanced geometric Weyl quantization
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6 Feb. 2019, 12:00-13:00
QLunch: From affine sl(2) to Virasoro
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30 Jan. 2019, 12:00-13:00
QLunch: Decomposability of Linear Maps under Tensor Powers
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24 Jan. 2019, 14:15-15:15
GAMP/QMATH Seminar: Schmidt number of bipartite and multipartite states under local projections
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23 Jan. 2019, 12:00-13:00
QLunch: Summoning Quantum Information
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16 Jan. 2019, 12:00-13:00
QLunch: One-way quantum repeaters with photonic cluster states
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9 Jan. 2019, 12:00-13:00
QLunch: An index theorem for quantum charge transport
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19 Dec. 2018, 12:00-13:00
QLunch:The Keyl-Werner theorem and the spin of a mean-field state
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18 Dec. 2018, 13:00-14:00
QSeminar: Introduction to anyonic quantum gates II
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17 Dec. 2018, 15:30-16:30
QSeminar: Introduction to anyonic quantum gates I
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12 Dec. 2018, 12:00-13:00
QLunch: A quantum code for quantum homomorphic encryption and malleable quantum shared secrets
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5 Dec. 2018, 12:00-13:00
QLunch: Lieb–Thirring inequalities and Weyl-type asymptotics for difference operators
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28 Nov. 2018, 12:00-13:00
QLunch: Tree bijections for 2d Causal Triangulation
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21 Nov. 2018, 12:00-13:00
QLunch: The structure of 3-dimensional causal triangulations
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14 Nov. 2018, 12:00-13:00
QLunch: Non-closure of the set of quantum correlations
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7 Nov. 2018, 12:00-13:00
QLunch: Optimal Upper Bound for the Correlation Energy of the Mean-Field Fermi Gas
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31 Oct. 2018, 12:00-13:00
QLunch: Quantum ciphertext authentication and key recycling with the trap code
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24 Oct. 2018, 12:00-13:00
QLunch: Formulas of Szegő type for the periodic Schrödinger operator
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10 Oct. 2018, 12:00-13:00
QLunch: Non-closure of quantum correlation matrices and factorizable channels that require infinite dimensional ancilla
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3 Oct. 2018, 12:00-13:00
QLunch: A simple 2nd order lower bound to the energy of dilute Bose gases
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26 Sept. 2018, 12:00-13:00
QLunch: Entanglement of excited states
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19 Sept. 2018, 12:00-13:00
QLunch: TBA
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12 Sept. 2018, 12:00-13:00
QLunch: Asymptotic port-based teleportation
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5 Sept. 2018, 12:00-13:00
QLunch: Constructing local frustration free Lindbladians with given MPDOs as stable space
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19 July 2018, 14:15-15:15
GAMP/QMATH Lecture: Containment between LMI domains and the existence of quantum channels
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18 July 2018, 12:00-13:00
GAMP/QMATH Lecture: Generic Representations of quantum coordinate algebras
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13 June 2018, 12:00-13:00
QLunch: Quantum advantage of unitary Clifford circuits with magic state inputs
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6 June 2018, 12:00-13:00
QLunch: On the construction of exponentially localized Wannier functions
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30 May 2018, 12:00-13:00
QLunch: Quasi-factorization of the quantum relative entropy
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23 May 2018, 12:00-13:00
QLunch: : Multivariate operator means and the barycenter of relative entropy
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17 May 2018, 15:15-16:00
GAMP/QMATH Seminar: Tsirelson's problems and the entanglement breaking rank
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16 May 2018, 12:00-13:00
QLunch:Dephrasure channel and superadditivity of coherent information
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9 May 2018, 12:00-13:00
QLunch: The spectrum of asymptotic LOCC conversion
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2 May 2018, 12:00-13:00
QLunch: Learning how to solve PDEs via the FEM.
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25 Apr. 2018, 12:00-13:00
QLunch: Distinguished self-adjoint extensions of operators with gaps
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18 Apr. 2018, 12:00-13:00
QLunch: Searching faster using quantum walks
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4 Apr. 2018, 12:00-13:00
QLunch: Schur-Weyl duality and entanglement
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28 Mar. 2018, 12:00-13:00
QLunch: Entanglement Extraction, Energy and Einstein Equation
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21 Mar. 2018, 13:00-14:00
QLunch: Oddities of Quantum colorings
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14 Mar. 2018, 12:00-13:00
QLunch: The asymptotic spectrum
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7 Mar. 2018, 12:00-13:00
QLunch: On best rank-k approximations to tensors
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28 Feb. 2018, 12:00-13:00
QLunch: Connes' embedding problem and quantum XOR games
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21 Feb. 2018, 12:00-13:00
QLunch: Quantum Flag Manifolds and Quantum Cluster Algebras
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14 Feb. 2018, 12:00-13:00
QLunch: Quantum computing with Fibonacci anyons
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7 Feb. 2018, 12:00-13:00
QLunch: Hardy-Lieb-Thirring Inequalities for Fractional Pauli Operators
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31 Jan. 2018, 12:00-13:00
QLunch: A Note on Arbitrary Group Quantum-Secure PRPs
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17 Jan. 2018, 12:00-13:00
QLunch: Let G_2 be your friend
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11 Jan. 2018, 15:15-16:15
GAMP/QMATH Lecture: Semidefinite Optimization for Quantum Information Processing
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10 Jan. 2018, 12:00-13:00
QLunch: Topics in Quantum Entropy and Entanglement
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20 Dec. 2017, 12:00-13:00
QLunch: Faces and orbits in invariant convex sets and cones
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13 Dec. 2017, 12:00-13:00
QLunch: Strongly interacting quantum systems in one dimension
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6 Dec. 2017, 12:00-13:00
QLunch: Markovianizing cost of tripartite quantum states
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29 Nov. 2017, 12:00-13:00
Quantum Lunch: Benchmarking purity and correlations for quantum states
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22 Nov. 2017, 12:00-13:00
QLunch: Communication games reveal preparation contextuality
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15 Nov. 2017, 12:00-13:00
QLunch: Unforgeable quantum encryption
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1 Nov. 2017, 12:00-13:00
QLunch: On the interplay between algebraic geometry and complexity theory
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25 Oct. 2017, 12:00-13:00
QLunch: Geometry of the quantum set of correlations
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18 Oct. 2017, 12:00-13:00
QLunch: Spectral flow of magnetic knots
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11 Oct. 2017, 12:00-13:00
Quantum Lunch: The diatomic repulsion in reduced Hartree-Fock Theory
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4 Oct. 2017, 12:00-13:00
Quantum Lunch: Entanglement and Chaos: Linear entropy production at instabilities
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27 Sept. 2017, 12:00-13:00
Quantum Lunch: The Lee-Huang-Yang Formula for Dilute Bose Gases
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13 Sept. 2017, 12:00-13:00
Quantum Lunch: Quantum Learning Algorithms
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6 Sept. 2017, 12:00-13:00
QLunch: The Entropy Power Inequality with quantum memory
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29 Aug. 2017, 12:00-13:00
QLunch Lecture: Entanglement for noisy channel coding
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22 Aug. 2017, 15:00-16:00
QMATH Lecture: Lieb-Thirring inequality and gradient correction
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16 Aug. 2017, 12:00-13:00
QLunch: The excitation spectrum of Bose gases interacting through singular potentials
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28 June 2017, 12:00-13:00
QLunch: On the stability of the quantum Darmois-Skitovich theorem
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22 June 2017, 14:00-15:00
QMATH Lecture: Logical paradoxes in deterministic quantum state injection
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21 June 2017, 12:00-13:00
Quantum Lunch: Peierls-Bogolyubov's inequality for deformed exponentials
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20 June 2017, 14:00-15:00
QMATH/GAMP Lecture: Contextuality and Noncommuative Geometry in Quantum Mechanics
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14 June 2017, 12:00-13:00
Quantum Lunch: General Error Correction for MERA Codes
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7 June 2017, 12:00-13:00
QLunch: The Bernstein Theorem
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31 May 2017, 12:00-13:00
Quantum Lunch: Topological Matter and Why You Should be Interested
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10 May 2017, 12:00-13:00
QLunch: Symmetry and Combinatorics for Identical Quantum Systems
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26 Apr. 2017, 12:00-13:00
Quantum Lunch: PEPS: Boundaries and spectral gap
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19 Apr. 2017, 12:00-13:00
QLunch: Quantum framework from simple physical principles for single systems
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18 Apr. 2017, 13:00-14:00
QMATH Lecture: Asymptotic entanglement concentration of W states
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5 Apr. 2017, 12:00-13:00
QLunch: Astronomical telescopes with quantum memories
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29 Mar. 2017, 12:00-13:00
Quantum Lunch: Ultimate data hiding in quantum mechanics and beyond
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22 Mar. 2017, 12:00-13:00
Quantum Lunch: On the oval conjecture
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15 Mar. 2017, 12:00-13:00
Quantum Lunch: Local boundary states imply gap for the parent Hamiltonian of PEPS
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8 Mar. 2017, 12:00-13:00
Quantum Lunch: Solving linear systems of equations in logarithmic space: quantum versus classical algorithms
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1 Mar. 2017, 12:00-13:00
Quantum Lunch: Quantum simulations with noisy quantum computers
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22 Feb. 2017, 12:00-13:00
Quantum Lunch: Ground states and excitations of homological codes
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15 Feb. 2017, 12:00-13:00
Quantum Lunch: A Reformulation of the Dirac-Frenkel Principle and the Bogoliubov-de-Gennes equations
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8 Feb. 2017, 12:00-13:00
QMATH/GAMP Lecture: Entropy accumulation
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3 Feb. 2017, 13:00-14:00
QMATH Lecture: On the dynamics of multi-component condensates: mixtures and spinors
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1 Feb. 2017, 12:00-13:00
Joint SYM and QMATH Lecture: Tsirelson's problem
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25 Jan. 2017, 12:00-13:00
Quantum Lunch: The PPT^2 conjecture in dimension 3
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18 Jan. 2017, 12:00-13:00
Quantum Lunch: Feynman-Kac formulas for the ultra-violet renormalized Nelson model
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12 Jan. 2017, 15:15-16:15
Joint QMATH/GAMP Seminar: Limit shapes in statistical mechanics
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11 Jan. 2017, 12:00-13:00
Quantum Lunch: To what extent can information propagation decouple from energy propagation?
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4 Jan. 2017, 12:00-13:00
Quantum Lunch: Fun with diagram algebras
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21 Dec. 2016, 12:00-13:00
Quantum Lunch: Quantum information on Jordan algebras
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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
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7 Dec. 2016, 12:00-13:00
Quantum Lunch: Universality in interacting topological insulators
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30 Nov. 2016, 12:00-13:00
Quantum Lunch: Instantaneous non-local quantum computation using the garden-hose model
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23 Nov. 2016, 12:00-13:00
Quantum Lunch: Semi-device-independent quantum randomness generation
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16 Nov. 2016, 12:00-13:00
Quantum Lunch: Marchenko--Pastur distributions and hypergeometric Hurwitz numbers
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2 Nov. 2016, 12:00-13:00
Quantum Lunch: Nonabelian braiding by topological solitons
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26 Oct. 2016, 12:00-13:00
Quantum Lunch: Quantum optics meets superconducting qubits
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19 Oct. 2016, 12:00-13:00
Quantum Lunch: Information-theoretic non-malleability and authentication
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12 Oct. 2016, 12:00-13:00
Quantum Lunch: Picking holes and cutting corners to achieve Clifford gates with the surface code
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28 Sept. 2016, 12:00-13:00
Quantum Lunch: Periodically driven impurity in the XX quantum spin chain
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21 Sept. 2016, 12:00-13:00
Quantum Lunch: Random tensor networks and multipartite entanglement
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14 Sept. 2016, 12:00-13:00
Quantum Lunch: The martingale method meets the detectability lemma
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7 Sept. 2016, 12:00-13:00
Quantum Lunch: Schrödinger Operators in Some Curvature Problems
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31 Aug. 2016, 12:00-13:00
Quantum Lunch: Disentangling entangled quantum states
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24 Aug. 2016, 12:00-13:00
Quantum Lunch: Autonomous feedback for superconducting qubits
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17 Aug. 2016, 12:00-13:00
Quantum Lunch:Tensor surgery and tensor rank
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10 Aug. 2016, 12:00-13:00
Quantum Lunch: An outsider's view on the mathematical foundations of machine learning
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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
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6 July 2016, 12:00-13:00
Summer Quantum Lunch: Sandwiches and Sandwiched Renyi Divergences
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29 June 2016, 12:00-13:00
Quantum Lunch: Reality of Temperley-Lieb Hamiltonian spectra
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22 June 2016, 12:00-13:00
Quantum Lunch: Quantum entropy derived from first principles
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15 June 2016, 12:00-13:00
Quantum Lunch: Quantum homomorphic encryption
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8 June 2016, 12:00-13:00
Quantum Lunch: Vote Talk
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1 June 2016, 12:00-13:00
Quantum Lunch: Introduction to fermionic observables
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25 May 2016, 12:00-13:00
Quantum Lunch: Scalar Field Theories with Polynomial Shift Symmetries
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18 May 2016, 12:00-13:00
Quantum Lunch: Landauer's principle and the energy cost of measurement
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11 May 2016, 14:00-15:00
After Quantum Lunch: Entropy power inequalities for qudits
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11 May 2016, 12:00-13:00
Quantum Lunch: Stahl's Theorem
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4 May 2016, 12:00-13:00
Quantum Lunch: Quantum gate learning in engineered qubit networks: Toffoli gate with always-on interactions
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27 Apr. 2016, 12:00-13:00
Quantum Lunch: Topological edge states are monogamous
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20 Apr. 2016, 12:00-13:00
Quantum Lunch: Geometry of random planar maps with high degrees
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13 Apr. 2016, 12:00-13:00
Quantum Lunch: Color Codes are cool
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6 Apr. 2016, 12:00-13:00
Quantum Lunch: Describing non-Markovian open quantum systems
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30 Mar. 2016, 12:00-13:00
Quantum Lunch: Key Distillation
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23 Mar. 2016, 12:00-13:00
Quantum Lunch: Dirac operators with magnetic link
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16 Mar. 2016, 12:00-13:00
Quantum Lunch: Quantum many-body fluctuations around nonlinear Schrödinger dynamics
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9 Mar. 2016, 12:00-13:00
Quantum Lunch: Towards experimentally feasible unbounded violation of quantum steering inequality
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2 Mar. 2016, 12:00-13:00
Quantum Lunch: Tradeoff bounds for local error correction
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24 Feb. 2016, 12:00-13:00
Quantum Lunch: Pattern formation in biological systems & Electroweak baryogenesis in 2HDMs
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17 Feb. 2016, 12:00-13:00
Quantum Lunch: Device-independent two-party cryptography secure against sequential attacks.
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10 Feb. 2016, 12:00-13:00
Quantum Lunch: Trace inequalities for arbitrary many matrices via pinching
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3 Feb. 2016, 12:00-13:00
Quantum Lunch: Tandem Talk
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27 Jan. 2016, 12:00-13:00
Quantum Lunch: Gaussian optimizers in quantum information
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20 Jan. 2016, 12:00-13:00
Quantum Lunch: Topological States in Graphene
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13 Jan. 2016, 12:00-13:00
Quantum Lunch: A Pfaffian formula for monomer-dimer partition functions
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6 Jan. 2016, 12:00-13:00
Quantum Lunch: Determinism and causality. Which aspects are shared between classical physics and quantum physics?
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16 Dec. 2015, 12:00-13:00
Quantum Lunch
Title: TBA
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9 Dec. 2015, 12:00-13:00
Quantum Lunch: Variational Expressions for Quantum Relative Entropies
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...
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2 Dec. 2015, 12:00-13:00
Quantum Lunch
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.
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25 Nov. 2015, 12:00-13:00
Quantum Lunch
Title: TBA
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18 Nov. 2015, 12:00-13:00
Quantum Lunch
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 ...
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11 Nov. 2015, 12:00-13:00
Quantum Lunch
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
Speaker: Shunji Matsuura
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28 Oct. 2015, 12:00-13:00
Quantum Lunch: Interaction Effects in Spin-Wave Theory
Speaker: Niels Benedikter
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21 Oct. 2015, 12:00-13:00
Quantum Lunch: Random permutations and the mean-field Heisenberg model
Speaker: Jakob Björnberg
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14 Oct. 2015, 12:00-13:00
Quantum Lunch: Renormalising entanglement distillation
Title: Renormalising entanglement distillation
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7 Oct. 2015, 12:00-13:00
Quantum Lunch: Entanglement Measures
Speaker: Roberto Ferrara
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30 Sept. 2015, 12:00-13:00
Quantum Lunch: Accurate atomic radii from Thomas-Fermi Theory
Speaker: Jan Philip Solovej
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23 Sept. 2015, 12:00-13:00
Quantum Lunch: Bogoliubov correction to the mean-field dynamics of interacting bosons
Speaker: Marcin Napiórkowski
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16 Sept. 2015, 12:00-13:00
Quantum Lunch: 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.
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9 Sept. 2015, 12:00-13:00
Quantum Lunch
Title: Anyons in the average-field approximation
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2 Sept. 2015, 12:00-13:00
Quantum Lunch: Non-binding of strongly coupled many-polarons in dimensions two and three
Speaker: Anton Samojlow
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19 Aug. 2015, 12:00-13:00
Quantum Lunch: Estimates for the lowest eigenvalue of magnetic Laplacians.
Speaker: Fabian Portmann
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1 July 2015, 12:00-13:00
Quantum Lunch: Localization from superselection rules in translation invariant systems
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)
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24 June 2015, 12:00-13:00
Quantum Lunch: Bogoliubov theory at positive temperature
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...
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17 June 2015, 12:00-13:00
Quantum Lunch: Quantum-information processing with solid-state single-photon sources
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10 June 2015, 12:00-13:00
Quantum Lunch: The fractional Laplacian on bounded domains
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3 June 2015, 12:00-13:00
Quantum Lunch: Learning and testing of mixed state spectra
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
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13 May 2015, 12:00-13:00
Quantum Lunch: An adaptive attack on Wiesner's quantum money
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
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29 Apr. 2015, 12:00-13:00
Quantum Lunch: Factorizable completely positive maps and Quantum Information Theory
Title: Factorizable completely positive maps and Quantum Information Theory
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22 Apr. 2015, 12:00-13:00
Quantum Lunch: Energy Levels of Dipoles in Graphene
Speaker: Simone Rademacher
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15 Apr. 2015, 12:00-13:00
Quantum Lunch
Title: TBA
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8 Apr. 2015, 12:00-13:00
Quantum Lunch
Title: A Classical Analog to Entanglement ReversibilityAbstract: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
Speaker: Gorjan Alagic
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18 Mar. 2015, 12:00-13:00
Quantum Lunch
Title: TBA
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11 Mar. 2015, 12:00-13:00
Quantum Lunch: Heralded quantum gate with integrated error detection
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4 Mar. 2015, 12:00-13:00
Quantum Lunch: Error distributions on large entangled states with non-Markovian dynamics
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25 Feb. 2015, 12:00-13:00
Quantum Lunch: A flea on Schrödinger's cat
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18 Feb. 2015, 12:00-13:00
Quantum Lunch: Cryptography
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11 Feb. 2015, 12:00-13:00
Quantum Lunch: Ground state entanglement constrains low energy excitations
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4 Feb. 2015, 12:00-13:00
Quantum Lunch
Speaker: Niels Benedikter
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28 Jan. 2015, 12:00-13:00
Quantum Lunch
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....
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21 Jan. 2015, 12:00-13:00
Quantum Lunch
Speaker: Jeremy Sok
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14 Jan. 2015, 12:00-13:00
Quantum Lunch: Finding large gaps between tensor rank and border rank via algebras
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....