Abstract
Entanglement is essential to many quantum information applications, but it is easily destroyed by quantum decoherence arising from interaction with the environment. We report the first experimental demonstration of an entanglement-based protocol that is resilient to loss and noise which destroy entanglement. Specifically, despite channel noise 8.3 dB beyond the threshold for entanglement breaking, eavesdropping-immune communication is achieved between Alice and Bob when an entangled source is used, but no such immunity is obtainable when their source is classical. The results prove that entanglement can be utilized beneficially in lossy and noisy situations, i.e., in practical scenarios.
- Received 21 March 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.010501
© 2013 American Physical Society
Viewpoint
Don’t Cry over Broken Entanglement
Published 1 July 2013
A secure communication channel that relies on quantum entanglement survives despite the noisy break up of the entanglement itself.
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