Erwin Schrödinger Center for Quantum Science & Technology (ESQ)

The large international group of researchers introduce the concept of channels that break temporal correlations, explain how they are related to the standard breaking channels, and prove the following results: (1) a robustness-based measure for non-entanglement-breaking channels can be probed by temporal nonseparability, (2) a non-steerability-breaking channel can be quantified by channel steering, (3) temporal steerability and nonmacrorealism can be used for, respectively, distinguishing unital steerability-breaking channels and nonlocality-breaking channels for a maximally entangled state. Finally, a two-dimensional depolarizing channel is experimentally implemented as a proof-of-principle example to demonstrate the hierarchy relation of nonbreaking channels using temporal quantum correlations.

For more information see:

https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.3.020338

https://mtcq.github.io