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Monday, July 11, 2016 2:30 pm - 2:30 pm EDT (GMT -04:00)

Colloquium: Jess Riedel

Where are the branches in a many-body wavefunction?

Jess Riedel, Perimeter Institute

When the wavefunction of a macroscopic system (such as the universe) unitarily evolves from a low-entropy initial state, we expect that it develops quasiclassical "branches", i.e., a decomposition into orthogonal components each taking well-defined, distinct values for macroscopic observables. Is this decomposition unique? Can the number of branches decrease in time?

Tuesday, July 12, 2016 12:00 pm - 12:00 pm EDT (GMT -04:00)

Seminar: Jonathan Oppenheim

Quantum thermodynamics - a review

Jonathan Oppenheim, University College London

I review recent results in quantum thermodynamics. This includes the emergence of many second laws at the micro-scale, fully quantum fluctuation relations for work and for states, a proof of the third law of thermodynamics applicable to erasing a bit of memory, and a grand canonical ensemble for non-commuting conserved quantities. Progress has been made using tools from quantum information theory.

Monday, July 18, 2016 2:30 pm - 2:30 pm EDT (GMT -04:00)

Colloquium: Michael Walter

Quantum information in tensor networks

Michael Walter, Stanford University

In this talk, we explore how quantum information is encoded in tensor networks. To this end, we study the properties of random tensor networks with large bond dimension. We find that, from the perspective of quantum information theory, entanglement emerges from the geometry of the network by a multipartite entanglement distillation process.

Thursday, August 4, 2016 12:00 pm - 12:00 pm EDT (GMT -04:00)

Seminar: Sophie Laplante

Robust Bell inequalities from communication complexity

Sophie Laplante, Université Paris Diderot

The question of how large Bell inequality violations can be, for quantum distributions, has been the object of much work in the past several years. We say a Bell inequality is normalized if its absolute value does not exceed 1 for any classical (i.e. local) distribution.

Monday, August 8, 2016 2:30 pm - 2:30 pm EDT (GMT -04:00)

Colloquium: Ken Brown

Error Models and Error Thresholds

Ken Brown, Georgia Tech

The error threshold for fault-tolerant quantum computation depends
strongly on the error model.  Most calculations assume a depolarizing
model, which allows for efficient calculations based on random
applications of Pauli errors.  We have been exploring how the
threshold changes for both non-unital and coherent operations.  I will

Thursday, August 11, 2016 12:00 pm - 12:00 pm EDT (GMT -04:00)

Special seminar: Vincent Russo

Extended nonlocal games and monogamy-of-entanglement games

Vincent Russo, Institute for Quantum Computing

Two-player one-round games have served to be an instrumental model in theoretical computer science. Likewise, nonlocal games consider this model when the players have access to an entangled quantum state. In this talk, I will consider a broader class of nonlocal games (extended-nonlocal games), where the referee shares an entangled state along with the players.