Quantum relays and noise suppression using linear optics

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Citation of Original Publication

B. C. Jacobs, T. B. Pittman, and J. D. Franson, Quantum relays and noise suppression using linear optics, hys. Rev. A 66, 052307 (2002), DOI:https://doi.org/10.1103/PhysRevA.66.052307

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©2002 The American Physical Society

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Abstract

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.