Stochastic quantum dynamics of a continuously monitored laser

Wiseman, H. M. (1993) Stochastic quantum dynamics of a continuously monitored laser. Physical Review A, 47 6: 5180-5192. doi:10.1103/PhysRevA.47.5180

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Author Wiseman, H. M.
Title Stochastic quantum dynamics of a continuously monitored laser
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.47.5180
Open Access Status File (Publisher version)
Volume 47
Issue 6
Start page 5180
End page 5192
Total pages 13
Place of publication College Park, MD, United States
Publisher American Physical Society
Subject 3100 Physics and Astronomy
3107 Atomic and Molecular Physics, and Optics
Abstract The stochastic dynamics of the quantum state of a laser conditioned on continuous intensity and phase-sensitive measurements on its output are examined. We first develop the essential model for a Poissonian laser, and then generalize it for regularly pumped lasers. We show that the rate of phase diffusion (which gives the laser linewidth) is not affected by the regularity of the pump. In both cases, heterodyne detection causes the phase variance in the conditioned laser state to become very small, yet remain significantly above (at least three times) that of a coherent state. The phase diffusion is manifest by a random walk undertaken by the mean phase, with the stochasticity arising from the local-oscillator shot noise. In contrast, intensity measurements have no effect on a Poissonian laser. For a perfectly regularly pumped laser, coarse-grained intensity measurements (for which an approximate theory is developed here) collapse the state to one with an arbitrarily small photon-number variance-to-mean ratio.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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