Channel activation of CHSH nonlocality

Yujie Zhang, Rodrigo Araiza Bravo, Virginia O. Lorenz, Eric Chitambar

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number043003
JournalNew Journal of Physics
Issue number4
StatePublished - Apr 2020


  • Chsh breaking channel
  • Nonlocality breaking channel
  • Superactivation

ASJC Scopus subject areas

  • General Physics and Astronomy


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