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

Autor:	Sagi, Yoav, Almog, Ido, Davidson, Nir
Rok vydání:	2010
Předmět:	Quantum Physics Condensed Matter - Quantum Gases Physics - Atomic and Molecular Clusters
Zdroj:	Phys. Rev. Lett. 105, 053201 (2010)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.105.053201
Popis:	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. Comment: 10 pages, 3 figures, including supplementary information section
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1004.1011 Zobrazit plný text záznamu View this record from Arxiv