Phase sensitive pumping and coherence of superposition states

de Oliveira, M.C., Mizrahi, S.S. and Moussa, M.H.Y. (2001) Phase sensitive pumping and coherence of superposition states. Journal of Optics B-quantum And Semiclassical Optics, 3 2: 57-66. doi:10.1088/1464-4266/3/2/307

Author de Oliveira, M.C.
Mizrahi, S.S.
Moussa, M.H.Y.
Title Phase sensitive pumping and coherence of superposition states
Journal name Journal of Optics B-quantum And Semiclassical Optics   Check publisher's open access policy
ISSN 1464-4266
Publication date 2001-04
Sub-type Article (original research)
DOI 10.1088/1464-4266/3/2/307
Volume 3
Issue 2
Start page 57
End page 66
Total pages 10
Editor E. Arimondo
Place of publication Bristol, England
Publisher Institute of Physics Publishing
Collection year 2001
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract The continuous parametric pumping of a superconducting lossy QED cavity supporting a field prepared initially as a superposition of coherent states is discussed. In contrast to classical pumping, we verify that the phase sensitivity of the parametric pumping makes the asymptotic behaviour of the cavity field state strongly dependent on the phase theta of the coherent state \ alpha > = \ alpha \e(i theta)>. Here we consider theta = pi /4, -pi /4 and we analyse the evolution of the purity of the superposition states with the help of the linear entropy and fidelity functions. We also analyse the decoherence process quantitatively through the Wigner function, for both states, verifying that the decay is slightly modified when compared to the free decoherence case: for theta = -pi /4 the process is accelerated while for theta = pi /4 it is delayed.
Keyword Optics
Physics, Applied
Parametric Pumping
Linear Entropy
Dynamical Fidelity Function
Distinguishable States
Quantum Interference
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 2 times in Scopus Article | Citations
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Created: Tue, 14 Aug 2007, 16:15:27 EST