Entanglement's benefit survives an entanglement-breaking channel

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 enta...

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Veröffentlicht in:Physical review letters 2013-07, Vol.111 (1), p.010501-010501, Article 010501
Hauptverfasser: Zhang, Zheshen, Tengner, Maria, Zhong, Tian, Wong, Franco N C, Shapiro, Jeffrey H
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.111.010501