Process tomography of dynamical decoupling in a dense optically trapped atomic ensemble

Details Process tomography of dynamical decoupling in a dense optically trapped atomic ensemble Process tomography of dynamical decoupling in a dense optically trapped atomic ensemble

2010-04-07

arxiv.org/abs/1004.1011v1

Phys. Rev. Lett. 105, 053201 (2010)

Physics

Quantum Physics

10 pages, 3 figures, including supplementary information section

Scientific paper

10.1103/PhysRevLett.105.053201

Atomic ensembles have many potential applications in quantum information science. Owing to collective enhancement, working with ensembles at high densities increases the overall efficiency of quantum operations, but at the same time also increases the collision rate and leads to faster decoherence. Here we report on experiments with optically trapped 87Rb atoms demonstrating a 20-fold increase of the coherence time when a dynamical decoupling sequence with more than 200 pi-pulses is applied. We perform quantum process tomography and demonstrate that using the decoupling scheme a dense ensemble with an optical depth of 230 can be used as an atomic memory with coherence times exceeding 3 sec.

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