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Monday, January 31, 2011 12:30 pm - 1:00 pm EST (GMT -05:00)

Gus Gutoski: Short quantum games characterize PSPACE

Gus Gutoski, Institute for Quantum Computing

Abstract

I will present material from http://arxiv.org/abs/1011.2787. The abstract at that link is included below. Essentially, the result is a strengthening of the QIP=PSPACE result of Jain, Ji, Upadhyay, and Watrous from 2009. A goal of this talk is to clarify the statement and meaning of the multiplicative weights update method and illustrate how it can be used to prove space bounds in quantum complexity theory.

Tuesday, February 1, 2011 12:00 pm - 1:00 pm EST (GMT -05:00)

Jon Tyson: Estimates of Channel Reversibility and Conditional Min-Entropy using Directional Iterates

Jon Tyson, Institute for Quantum Computing (IQC)

Abstract

I will derive provably-tight two-sided estimates of the reversibility of an
arbitrary quantum channel in terms of entanglement fidelity and on the
conditional min-entropy of an arbitrary bipartite mixed quantum state. Channel reversals have been studied by a number of research groups under the banner of "Approximate quantum error recovery."

Monday, February 14, 2011 12:30 pm - 1:30 pm EST (GMT -05:00)

Oleg Gittsovich : Squashing model and applications to quantum key distribution protocols

Oleg Gittsovich, IQC

Abstract

We present a framework for describing linear optical measurement devices. This leads to the definition of the squashing map. We demonstrate that this general approach gives strong statements for several measurement devices commonly used in optical implementations of quantum communication protocols.