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Channel Activation of CHSH Nonlocality

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arxiv 1911.06349 v2 pith:ZYOY6TVQ submitted 2019-11-14 quant-ph

Yujie Zhang , Rodrigo Araiza Bravo , Virginia O. Lorenz , Eric Chitambar This is my paper · ORCID
classification quant-ph
keywords channelsactivationchsh-breakingchshnonlocalityquantumstatesanalogous
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Quantum channels that break CHSH nonlocality on all input states are known as CHSH-breaking channels. In quantum networks, such channels are useless for distributing correlations that can violate the CHSH Inequality. Motivated by previous work on activation of nonlocality in quantum states, here we demonstrate an analogous activation of CHSH-breaking channels. That is, we show that certain pairs of CHSH-breaking channels are no longer CHSH-breaking when used in combination. We find that this type of activation can emerge in both uni-directional and bi-directional communication scenarios.

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