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Kluwer Academic Publishers eBooks

Spontaneous Intrinsic Decoherence in Rabi Oscillations Experiments

Rodolfo Bonifacio, Stefano Olivares

Published Feb 24, 2006• 2 citations
Publisher

Abstract

We present a simple theoretical description of a recent QED experiment where damping of Rabi oscillations cannot be attributed to environment-induced decoherence (EID). We generalize a previous formalism to describe also nonexponential decay. The possibility of spontaneous intrinsic decoherence (SID), i.e., not due to interaction with environment or fluctuation of some internal parameter but of purely quantum mechanical origin, is discussed. Moreover an experimental cavity QED test of SID is suggested. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

DOI
10.1007/0-306-47114-0_12

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We present a simple theoretical description of a recent QED experiment where damping of Rabi oscillations cannot be attributed to environment-induced decoherence (EID). We generalize a previous formalism to describe also nonexponential decay. The possibility of spontaneous intrinsic decoherence (SID), i.e., not due to interaction with environment or fluctuation of some internal parameter but of purely quantum mechanical origin, is discussed. Moreover an experimental cavity QED test of SID is suggested. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
By means of two simple examples, phase and amplitude damping, the impact of decoherence on the dynamical Casimir effect is investigated. Even without dissipating energy (i.e., pure phase damping), the amount of created particles can be diminished significantly via the coupling to the environment (reservoir theory) inducing decoherence. For a simple microscopic model, it is demonstrated that spontaneous decays within the medium generate those problems; Rabi oscillations are far more advantageous in that respect. These findings are particularly relevant in view of a recently proposed experimental verification of the dynamical Casimir effect.
By means of two simple examples: phase and amplitude damping, the impact of decoherence on the dynamical Casimir effect is investigated. Even without dissipating energy (i.e., pure phase damping), the amount of created particles can be diminished significantly via the coupling to the environment (reservoir theory) inducing decoherence. For a simple microscopic model, it is demonstrated that spontaneous decays within the medium generate those problems -- Rabi oscillations are far more advantageous in that respect. These findings are particularly relevant in view of a recently proposed experimental verification of the dynamical Casimir effect. PACS: 42.50.Lc, 03.65.Yz, 03.70.+k, 42.50.Dv.
Rabi oscillations may be viewed as an interference phenomenon due to a coherent superposition of different quantum paths, as in Young's two-slit experiment. The inclusion of the atomic external variables causes a non-dissipative damping of the Rabi oscillations. More generally, the atomic translational dynamics induces damping in the correlation functions which describe non-classical behaviors of the field and internal atomic variables, leading to the separability of these two subsystems. We discuss on the possibility of interpreting this intrinsic decoherence as a “which-way” information effect and we apply to this case a quantitative analysis of the complementarity relation as introduced by Englert ( Phys. Rev. Lett. 77 (1996) 2154).
In recent years decoherence has been widely discussed and accepted as a mechanism responsible for the emergence of classicality in quantum measurements and the absence in the real world of Schrödinger-cat-like states [ 2 , 6 , 7 , 11 , 12 ]. Let me start with recalling the Schrödinger cat paradox. It was a hypothetical experiment proposed by Schrödinger in 1935 which can be briefly described as follows. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.