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Journal of Low Temperature Physics

Quantum nondemolition measurement of the photon number in a Josephson-junction cavity

Noriyuki Hatakenaka, Tetsuo Ogawa

Published Feb 1, 1997• 3 citations
Publisher
DOI
10.1007/bf02399661

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We propose a scheme for realizing a quantum nondemolition (QND) measurement of a small number of optical photons. Our scheme has two stages: First, we couple a propagating light pulse with fixed photon number to a trapped cold atomic gas within a cavity, such that the pulse is stored within a collective polariton mode. Second, a small-photon-number measurement is engineered by monitoring the cavity-transmission spectrum. Since the polariton mode profile is preserved during the process of detecting the spectrum, photon-number QND measurements could be achieved by retrieving the light pulse from the polariton mode. We also discuss a method which uses QND measurements to generate small-photon Fock states.