Phys. Rev. A 66, 052307 (2002) [6 pages]Quantum relays and noise suppression using linear opticsReceived 3 May 2002; published 15 November 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.66.052307
DOI:
10.1103/PhysRevA.66.052307
PACS:
03.67.Hk, 42.50.-p, 03.67.Lx
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