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Entanglement-assisted scheme for nondemolition detection of the presence of a single photon

In this paper, we propose a resources-optimal linear-optical scheme for quantum nondemolition detection of single-photon presence. By measuring the state of ancillary photons, the presence of a photon in signal mode is revealed with a success probability of 1/2 without any disturbance to its state. We also show how to tune the setup to perform quantum nondemolition measurement of the signal photon state, and we provide tradeoff between the extracted information and the signal state disturbance. Moreover, the optimality of resources and methods by which to increase the success probability are discussed.

preprint2013arXivOpen access
Marek BulaKarol BartkiewiczAntonín ČernochKarel Lemr
physics.atom-phphysics.opticsquant-ph
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Marek BulaKarol BartkiewiczAntonín ČernochKarel Lemr

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