Long-time coherence in echo spectroscopy with π/2-π-π/2 pulse sequence

Goussev, Arseni and Jacquod, Philippe (2010) Long-time coherence in echo spectroscopy with π/2-π-π/2 pulse sequence. Physical Review A (PRA), 82 (5). 052114-052119. ISSN 1050-2947

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Official URL: http://dx.doi.org/10.1103/PhysRevA.82.052114

Abstract

Motivated by atomic optics experiments, we investigate a class of fidelity functions describing the reconstruction of quantum states by time-reversal operations as MDa(t)=|〈ψ|eiH2t/2eiH1t/2e-iH2t/2e-iH1t/2|ψ〉|2. We show that the decay of MDa is quartic in time at short times and that it freezes well above the ergodic value at long times, when H2-H1 is not too large. The long-time saturation value of MDa contains easily extractable information on the strength of decoherence in these systems.

Item Type: Article
Subjects: F300 Physics
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics and Information Sciences
Depositing User: Arseni Goussev
Date Deposited: 22 Oct 2012 12:47
Last Modified: 24 May 2017 17:17
URI: http://nrl.northumbria.ac.uk/id/eprint/9856

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