Loophole-free Einstein-Podolsky-Rosen experiment via quantum steering

Understand

Tests of the predictions of quantum mechanics for entangled systems have provided increasing evidence against local realistic theories.

• However, there still remains the crucial challenge of simultaneously closing all major loopholes - the locality, freedom-of-choice, and detection loopholes - in a single experiment.
• An important sub-class of local realistic theories can be tested with the concept of "steering".
• The term steering was introduced by Schr\"odinger in 1935 for the fact that entanglement would seem to allow an experimenter to remotely steer the state of a distant system as in the Einstein-Podolsky-Rosen (EPR) argument.