Decoherence as a Probe of Coherent Quantum Dynamics

Details Decoherence as a Probe of Coherent Quantum Dynamics Decoherence as a Probe of Coherent Quantum Dynamics

2003-07-05

arxiv.org/abs/quant-ph/0307034v2

Phys. Rev. E 69, 027201 (2004)

Physics

Quantum Physics

4 pages, 2 figures, submitted to Phys. Rev. E as a Brief Report. New version contains minor clarifying modifications to previo

Scientific paper

10.1103/PhysRevE.69.027201

The effect of decoherence, induced by spontaneous emission, on the dynamics of cold atoms periodically kicked by an optical lattice is experimentally and theoretically studied. Ideally, the mean energy growth is essentially unaffected by weak decoherence, but the resonant momentum distributions are fundamentally altered. It is shown that experiments are inevitably sensitive to certain nontrivial features of these distributions, in a way that explains the puzzle of the observed enhancement of resonances by decoherence [Phys. Rev. Lett. 87, 074102 (2001)]. This clarifies both the nature of the coherent evolution, and the way in which decoherence disrupts it.

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