Marek Bula, Karol Bartkiewicz, Antonín Černoch, Karel Lemr
In this paper we propose a resources-optimal linear-optical scheme for quantum non-demolition detection of single photon presence. By measuring the state of ancillary photons, the presence of a photon in signal mode is revealed with success probability of 1/2 without any disturbance to its state. We also show how to tune the setup to perform quantum non-demolition measurement of the signal photon state and we provide trade-off between the extracted information and the signal state disturbance. Apart from the linear-optical implementation, we show how to modify this scheme for the platform of quantum dots {where it can be applied to count active dots (qubits) without disturbing the quantum information}. Moreover the optimality of resources and ways of how to increase the success probability are discussed.
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http://arxiv.org/abs/1212.5366
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