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Springer proceedings in physics

Quantum Non-Demolition Measurements and Back-Action-Induced Squeezing in Atomic-Three-Level Systems

Philippe Grangier, J.-Ph. Poizat, Philippe Grelu, F. Castelli, Luigi A. Lugiato, Alice Sinatra

Published Jan 1, 1994• 0 citations
Publisher
DOI
10.1007/978-3-642-79101-7_13

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We present a theoretical study of the quantum non-demolition (QND) measurement of an optical intensity in an atomic three-level system, using a quantum linear response theory recently developed. The principle of this scheme is to use the two-photon crossed-phase- modulation effect, in order to couple the quantum intensity fluctuations of the `signal' beam to the quantum phase fluctuations of the `meter' beam. The predictions of the complete theory are compared with recent experimental results using a sodium atomic beam, which include the observation of both squeezing and QND effects.