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.
Original language | English |
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Pages (from-to) | 052114-052119 |
Journal | Physical Review A (PRA) |
Volume | 82 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2010 |