title: Coherence freeze in an optical lattice investigated via pump-probe spectroscopy.
abstract: 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 85Rb atoms in an optical lattice to gain information about the memory dynamics of the system. We monitor the time-dependent changes of frequencies experienced by atoms and 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.
authors.affiliation: Centre for Quantum Information & Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Canada. smaneshi@physics.utoronto.ca
authors.forename: Samansa
authors.initials: S
authors.lastname: Maneshi
authors.forename: Chao
authors.initials: C
authors.lastname: Zhuang
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Paul
authors.forename: Luciano S
authors.initials: LS
authors.lastname: Cruz
authors.forename: Aephraim M
authors.initials: AM
authors.lastname: Steinberg