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Optimal quantum self-tests based on binary nonlocal XOR games

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

This concept is important in device-independent quantum

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