Entanglement-assisted scheme for nondemolition detection of the presence of a single photon
Entanglement-assisted scheme for nondemolition detection of the presence of a single photon
In this paper, we propose a resource-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 …