Quantum non-demolition measurement of photon-arrival using an atom-cavity system

Details Quantum non-demolition measurement of photon-arrival using an atom-cavity system Quantum non-demolition measurement of photon-arrival using an atom-cavity system

2007-02-14

arxiv.org/abs/quant-ph/0702138v1

Phys. Rev. A 75, 032320 (2007)

Physics

Quantum Physics

12pages, 4figures, Submitted to Phys. Rev. A

Scientific paper

A simple and efficient quantum non-demolition measurement (QND) scheme is proposed in which the arrival of a signal photon is detected without affecting the qubit state. The proposed QND scheme functions even if the ancillary photon is replaced with weak light composed of vacuum and one-photon states. Although the detection scheme is designed for entanglement sharing applications, it is also suitable for general purification of a single photon state.

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