Coherence freeze in an optical lattice investigated via pump-probe spectroscopy

Details Coherence freeze in an optical lattice investigated via pump-probe spectroscopy Coherence freeze in an optical lattice investigated via pump-probe spectroscopy

2010-05-14

arxiv.org/abs/1005.2635v2

PRL 105, 193001 (2010)

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.105.193001

Motivated by our observation of fast echo decay and a surprising coherence freeze, we have developed a pump-probe spectroscopy technique for vibrational states of ultracold $^{85}$Rb atoms in an optical lattice to gain information about the memory dynamics of the system. We use pump-probe spectroscopy to monitor the time-dependent changes of frequencies experienced by atoms and to characterize the probability distribution of these frequency trajectories. We show that the inferred distribution, unlike a naive microscopic model of the lattice, correctly predicts the main features of the observed echo decay.

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