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Free compression norms and Lp norms

Collins, B (University of Ottawa and AIMR)
Wednesday 04 September 2013, 15:30-16:30

Seminar Room 1, Newton Institute


Co-authors: Serban Belinschi (Queen's), Ion Nechita (CNRS, Toulouse UPS)

I will talk about a new norm that shows up naturally in the framework of random quantum channels. This norm relies on free probability theory and is called the free compression norm. We show that the problem of comparing it to Lp norms has applications to the understanding of the minimum output entropy (MOE) of typical quantum random channels. As an application, we establish violation of additivity of the MOE for typical quantum channels with Bell states, and find in this framework the optimal output dimension and the optimal violation.


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