Optimal quantum self-tests based on binary nonlocal XOR games

Self-testing a multipartite quantum state means verifying
the existence of the state based on the outcomes of unknown or untrusted
measurements.

This concept is important in device-independent quantum
cryptography.

There are some previously known results on self-testing
which involve nonlocal binary XOR games such as the CHSH test and the GHZ
paradox.  In our work we expand on these
results.  We provide a general criterion
which, when satisfied, guarantees that a given nonlocal binary XOR game is a
robust self-test.  The error term in this
result is quadratic, which is the best possible.  In my talk I will explain the conceptual
basis for the criterion and offer some examples.  This is joint work with Yaoyun Shi
(arXiv:1207.1819).

Event Type: 
Seminar
Collection/Series: 
Scientific Area(s): 
Speaker(s): 
Event Date: 
Mercredi, Novembre 7, 2012 - 16:00 to 17:30
Location: 
Time Room