Quantum relays and noise suppression using linear optics

Probabilistic quantum nondemolition (QND) measurements can be performed using linear optics and postselection. Here we show how QND devices of this kind can be used in a straightforward way to implement a quantum relay, which is capable of extending the range of a quantum cryptography system by supp...

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Veröffentlicht in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2002-11, Vol.66 (5), Article 052307
Hauptverfasser: Jacobs, B. C., Pittman, T. B., Franson, J. D.
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Sprache:eng
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Zusammenfassung:Probabilistic quantum nondemolition (QND) measurements can be performed using linear optics and postselection. Here we show how QND devices of this kind can be used in a straightforward way to implement a quantum relay, which is capable of extending the range of a quantum cryptography system by suppressing the effects of detector noise. Unlike a quantum repeater, a quantum relay system does not require entanglement purification or the ability to store photons.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.66.052307