Quantum-nondemolition measurement of photon arrival using an atom-cavity system | Zendy

Kunihiro Kojima | Zendy; Akihisa Tomita | Zendy

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Quantum-nondemolition measurement of photon arrival using an atom-cavity system

Author(s) -

Kunihiro Kojima,

Akihisa Tomita

Publication year - 2007

Publication title -

physical review a

Language(s) - English

Resource type - Journals

eISSN - 1094-1622

pISSN - 1050-2947

DOI - 10.1103/physreva.75.032320

Subject(s) - physics , photon , qubit , quantum entanglement , quantum mechanics , cavity quantum electrodynamics , quantum , arrival time , open quantum system , transport engineering , engineering

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

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