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Effect of quantum fluctuation on oscillatory superradiance

Kensuke S. Ikeda, S. Sawada

Physics Letters ANov 1, 19764 citations

Dynamics and Measurement of the Absolute Phase in Macroscopic Quantum Systems

Fernando Sols, Roger A. Hegstrom

Springer eBooksJan 1, 19950 citations

Macroscopic quantum fluctuations in noise-sustained optical patterns

Roberta Zambrini, Stephen Mark Barnett, Pere Colet +1 more

We investigate quantum effects in pattern formation for a degenerate optical parametric oscillator with walk-off. This device has a convective regime in which macroscopic patterns are both initiated and sustained by quantum noise. Familiar methods based on linearization about a pseudoclassical field fail in this regime and new approaches are required. We employ a method in which the pump field is treated as a c-number variable but is driven by the c-number representation of the quantum subharmonic signal field. This allows us to include the effects of the fluctuations in the signal on the pump, which in turn act back on the signal. We find that the nonclassical effects, in the form of squeezing, survive just above the threshold of the convective regime. Further, above threshold, the macroscopic quantum noise suppresses these effects.We investigate quantum effects in pattern formation for a degenerate optical parametric oscillator with walk-off. This device has a convective regime in which macroscopic patterns are both initiated and sustained by quantum noise. Familiar methods based on linearization about a pseudoclassical field fail in this regime and new approaches are required. We employ a method in which the pump field is treated as a c-number variable but is driven by the c-number representation of the quantum subharmonic signal field. This allows us to include the effects of the fluctuations in the signal on the pump, which in turn act back on the signal. We find that the nonclassical effects, in the form of squeezing, survive just above the threshold of the convective regime. Further, above threshold, the macroscopic quantum noise suppresses these effects.

arXiv:quant-ph/0108030Physical Review AJan 15, 200220 citations

Superradiance in free-space atomic ensembles

Igor Ferrier-Barbut

Jun 1, 20230 citations

Theory of coherent Raman superradiance imaging of condensed Bose gases

Hermann Uys, Pierre Meystre

We describe theoretically the dynamics of the off-resonant superradiant Raman scattering of light in a prolate atomic Bose-Einstein condensate, from the initial stages governed by quantum fluctuations to the subsequent semiclassical regime, and within a multimode theory that fully accounts for propagation effects. Our results are in good agreement with recent experimental results that exploit Raman superradiance as an imaging technique to probe the long-range coherence of condensates, including the observed time-dependent spatial features, and account properly for the macroscopic shot-to-shot fluctuations resulting from the quantum noise that initiates the superradiance process.We describe theoretically the dynamics of the off-resonant superradiant Raman scattering of light in a prolate atomic Bose-Einstein condensate, from the initial stages governed by quantum fluctuations to the subsequent semiclassical regime, and within a multimode theory that fully accounts for propagation effects. Our results are in good agreement with recent experimental results that exploit Raman superradiance as an imaging technique to probe the long-range coherence of condensates, including the observed time-dependent spatial features, and account properly for the macroscopic shot-to-shot fluctuations resulting from the quantum noise that initiates the superradiance process.

arXiv:cond-mat/0602343Physical Review AMar 12, 200729 citations

Bose-Einstein Condensation and Superradiance

Joseph V. Pulé, André F. Verbeure, Valentin Anatol'evich Zagrebnov

Lecture notes in physicsJan 1, 20061 citation

Absolute and convective superradiance: Dynamics and macroscopic quantum fluctuations

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