One way EPR steering and the local simulation of entangled states

Seminar author:Joseph Bowles

Event date and time:12/10/2014 03:00:pm

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Since the work of Bell, it has been known that entangled quantum states can produce correlations, termed ‘nonlocal’, that defy any explanation in classical physics. One way in which such correlations can manifest themselves is through the phenomenon of EPR-steering, which loosely speaking measures the degree to which measurements on one side (Alice) of a quantum state can affect, or ‘steer’, the state of the other (Bob). We show that this phenomenon can be fundamentally asymmetric [1], a property that is missing in standard ‘Bell’ nonlocality. That is, we show that it is possible for a state to exhibit EPR steering from Alice to Bob but not from Bob to Alice, giving a simple example for a 2-qubit state.

Finally, I will discuss the closely related phenomenon of ‘genuine hidden nonlocality’ [2] and the local simulation of entangled states using finite shared randomness [3].

[1] ‘One way Einstein-Podolsky-Rosen Steering’, Phys. Rev. Lett. 112, 200402 (2014)

[2] ‘Genuine Hidden Nonlocality’, Phys. Rev. Lett. 111, 160402 (2013)

[3] In preparation, to appear on arXiv soon.