Saturation of fidelity in the atom-optics kicked rotor

Details Saturation of fidelity in the atom-optics kicked rotor Saturation of fidelity in the atom-optics kicked rotor

2006-03-10

arxiv.org/abs/quant-ph/0603095v1

J. Phys. B: At. Mol. Opt. Phys. 39, L145-L151 (2006)

Physics

Quantum Physics

Scientific paper

10.1088/0953-4075/39/7/L01

We show that the quantum fidelity is accessible to cold atom experiments for a large class of evolutions in periodical potentials, properly taking into account the experimental initial conditions of the atomic ensemble. We prove analytically that, at the fundamental quantum resonances of the atom-optics kicked rotor, the fidelity saturates at a constant, time-independent value after a small number of kicks. The latter saturation arises from the bulk of the atomic ensemble, whilst for the resonantly accelerated atoms the fidelity is predicted to decay slowly according to a power law.

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