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Physical Review Letters

Reduced Quantum Fluctuations in Resonance Fluorescence

Daniel F. Walls, P. Zoller

Published Sep 7, 1981• 456 citations
Publisher

Abstract

We demonstrate that reduced quantum fluctuations or squeezing are present in both the atomic observables and the radiation field produced by a two-level atom undergoing resonance fluorescence.Received 28 May 1981DOI:https://doi.org/10.1103/PhysRevLett.47.709©1981 American Physical Society

DOI
10.1103/physrevlett.47.709

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We demonstrate that reduced quantum fluctuations or squeezing are present in both the atomic observables and the radiation field produced by a two-level atom undergoing resonance fluorescence.Received 28 May 1981DOI:https://doi.org/10.1103/PhysRevLett.47.709©1981 American Physical Society
The squeezing properties of the fluorescence field emitted by a two-level atom driven by a coherent laser field in a squeezed vacuum are calculated. We show that in the region of the anomalous resonance fluorescence the emitted field exhibits squeezing that is much larger than that in the input squeezed vacuum. The squeezing spectrum attains a minimum value that corresponds to 75% squeezing. We also find that, in the total fluorescence field, squeezing attains an optimum achievable value in the fluorescence field emitted by a two-level atom. The optimum squeezing is associated with the collapse of the system into a pure state.