[quantum-info] Talks and Visitors (inc. talk tomorrow, Monday Nov 15th)

William Matthews will at northala.net
Sun Nov 14 21:36:55 EST 2010


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------ This week ------

-- Talks --

Monday, Nov 15th 2010 12:30pm, IQC, RAC1 room 2009,
Patrick Hayden (McGill University)
Title: Quantum information as asymptotic geometry
Abstract: Quantum states are represented as vectors in an inner product space. Because the dimension of that state space grows exponentially with the number of its constituents, quantum information theory is in large part the asymptotic theory of finite dimensional inner product spaces, a field with its own long history. I’ll highlight some examples of how abstract mathematical results from that area, such Dvoretzky’s theorem, manifest themselves in quantum information theory as improvements on teleportation and as the raw material for counterexamples to the famous additivity conjecture. More recently, this perspective has led to methods for encrypting arbitrarily long messages using constant-sized secret keys. I'll sketch the connection and try to recruit an IQC experimentalist to implement this new approach to quantum cryptography.
 

Tuesday, Nov 16th 2010 4:00 pm, PI, Room 301,
Marcin Pawlowski (Institute of Theoretical Physics and Astrophysics, Gdansk)
Title: What does information causality imply?
Abstract: Nonlocality is the most striking feature of quantum mechanics. It might even be considered its defining feature and understanding it may be the most important step towards understanding the whole theory. Yet for a long time it was impossible to pinpoint the reason behind the exact amount of nonlocality allowed by quantum mechanics expressed by Tsirelson bound. Recently information causality has been shown to be the principle from which this bound can be derived. However the whole set of nonlocal correlations and nonlocal information processing protocols that quantum mechanics allows is not specified by the Tsirelson bound. It remains an open question whether this whole zoo of nonlocality can be derived from information causality. In this talk I present the fields where information causality is applied together with most recent results or lack of such.

-- Visitors --

Marcin Pawlowski (University of Gdansk) is visiting PI
until November 18th
hosted by Giulio Chiribella

Paolo Perinotti (Universita degli Studi di Pavia) is visiting PI
until November 18th
hosted by Giulio Chiribella

Taylor Hughes (University of Illinois, Urbana-Champaign) is visiting PI
until through November 22nd
hosted by Alioscia Hamma

Giacomo Mauro D'Ariano (Universita degli Studi di Pavia) is visiting PI
until December 2nd 
hosted by Giulio Chiribella

Patrick Hayden (McGill University) is visiting PI
until December 15th
hosted by Neil Turok

------ Upcoming (next 4 weeks - not exhaustive!) ------

-- Talks --

Monday, Nov 22nd 12:00 noon, IQC RAC1 Room 2009
Robert Raussendorf, University of British Columbia
"The 2D AKLT state is universal for measurement-based quantum computation."

Tuesday, Nov 23rd 04:00 pm, PI room 301
Paul Skrzypczyk, University of Bristol
"Small thermal machines"

Wednesday, Nov 24th
2:00 pm at PI, Room 405
Carl Bender
"Making sense of non-Hermitian Hamiltonians"
and at 04:00 pm also in 405
Patrick Hayden
"TBA" (Perimeter Institute Quantum Discussions)

Wednesday, Dec 1st 2:00pm PI Room 405
Sergey Bravyi
"TBA"

-- Visitors --

Paul Skrzypczyk (University of Bristol) will be visiting PI
November 20th 2010 through November 26th 2010
hosted by Robert Spekkens

Sergey Bravyi (IBM T. J. Watson Research Center) will be visiting PI
November 30th 2010 through December 2nd 2010
hosted by Lucien Hardy

Oliver Buerschaper (Max-Planck-Institut für Quantenoptik) will be visiting PI
December 5th 2010 through December 11th 2010
hosted by Michele Mosca

Lianao Wu (University of the Basque Country) will be visiting PI
December 6th 2010 through December 18th 2010
hosted by Daniel Gottesman


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