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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, April 11, 2011 12:30 pm - 1:30 pm EDT (GMT -04:00)

Sophie Schirmer: Optimal Control of Dissipative Dynamics: Markovian vs Non-Markovian systems

Sophie Schirmer, University of Cambridge

Abstract

I will cover the basics in terms of the control objectives and algorithms, details about the implementation, and recent results about the convergence behaviour, control landscape, and field characteristics and similarities and differences we see in Markovian vs Non-Markovian systems.

Part of a MITACS seminar series