April 2017 - ITP-quantumseminare

today's meeting @4pm E41.1
by Joe Renes 25 Apr '17

25 Apr '17

Hi all, today Tamás Kriváchy will present results from his master's thesis on foundations of thermodynamics. Best, -joe

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talk by Richard Kueng, Wednesday 2pm
by Joe Renes 12 Apr '17

12 Apr '17

Hi all, we settled on Wednesday at 2pm for Richard's talk. See below for the abstract and relevant papers. Best, -joe Title: Breaking the 4-design barrier: a graceful failure Abstract: A unitary t-design is a set of unitaries that is "evenly distributed" in the sense that the average of any t-th order polynomial over the design equals the average over the entire unitary group. In various fields -- e.g. quantum information theory -- one frequently encounters constructions that rely on matrices drawn uniformly at random from the unitary group. Often, it suffices to sample these matrices from a unitary t-design, for sufficiently high t. This results in more explicit, derandomized constructions. The most prominent unitary t-design considered in quantum information is the multi-qubit Clifford group. It is known to be a unitary 3-design, but, unfortunately, not a 4-design. Here, we give a simple, explicit characterization of the way in which the Clifford group fails to constitute a 4-design. Our results show that for various applications in quantum information theory and in the theory of convex signal recovery, Clifford orbits perform almost as well as those of true 4-designs. Preprints: https://arxiv.org/abs/1609.08172 https://arxiv.org/abs/1609.08595 https://arxiv.org/abs/1610.08070

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today's meeting 4pm E41.1
by Joe Renes 10 Apr '17

10 Apr '17

Hi all, today Martin Lickteig will tell us about the results of his master's thesis, which is concerned with resource theory and noisy operations in thermodynamics. Best, -joe

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today's group meeting E41.1 @ 4pm
by Joe Renes 03 Apr '17

03 Apr '17

Hi all, today we'll hear from Frances Hubis on her master's project. Best, -joe

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