Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Information: Atoms and Ions I

Q 17.4: Vortrag

Dienstag, 9. März 2010, 15:15–15:30, E 214

Loading atoms into a blue-box trap from a dark MOT: towards long lived quantum memory — •Fan Yang¹, Huan Nguyen¹, Torsten Mandel¹, Maximilian Plenert¹, Alexander Göbel¹, Shuai Chen², Zhen-Sheng Yuan^1,2, and Jian-Wei Pan^1,2 — ¹Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany — ²Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

Quantum memories are fundamental ingredients for quantum information processing systems. Of key importance is the requirement of long-lived quantum memories in a long-distance quantum communication network composed of atomic ensembles and linear optical elements. We discuss the various decoherence mechanisms existing in a cold-atomic-ensemble based quantum memory. Solutions to maintain the coherence of the stored quantum state are proposed accordingly. Cold atoms confined in a blue detuned optical dipole trap are expected to extend the lifetime of quantum memory to the order of several hundred milliseconds. We report here the preliminary experimental results of loading cold atoms of 87Rb from a dark magneto-optical trap into a blue-box trap which will serve as a medium for long-lived quantum memories. High optical depth is observed and expected to boost the retrieve efficiency of a quantum memory and meanwhile offers more chances for studying quantum simulation.