Transverse Mode Revival of a Light-Compensated Quantum Memory

Date: 2011-06-28
Authors Fan Yang, Torsten Mandel, Christian Lutz, Zhen-Sheng Yuan and Jian-Wei Pan
Journal No. Phys. Rev. A 83, 063420 (2011)
Abstract A long-lived quantum memory was developed based on light-compensated cold 87Rb atoms in a dipole trap. The lifetime of the quantum memory was improved by 40 folds, from 0.67 to 28 ms with the help of a compensation laser beam. Oscillations of the memory efficiency due to the transverse mode breathing of the singly excited spin wave have been clearly observed and clarified with a Monte Carlo simulation procedure. With detailed analysis of the decoherence processes of the spin wave in cold atomic ensembles, this experiment provides a benchmark for the further development of high-quality quantum memories.