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arXiv:1103.1528 · Nature

A single-atom quantum memory

Holger Specht, Christian Nölleke, Andreas Reiserer, Manuel Uphoff, Eden V. Figueroa, Stephan Ritter, Gerhard Rempe

Published Apr 28, 2011• 443 citations
arXivHTMLPDF
DOI
10.1038/nature09997

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The work presented in this thesis investigates theoretically and experimentally quantum memories with atomic ensembles, which are suited for long-distance quantum communication. For this purpose laser-cooled, ultracold atomic clouds of Rubidium 87 are used as memory for nonclassical single-photon states. Base on the atom-light interface of the protocol from Duan, Lukin, Cirac, Zoller (DLCZ) for long distance quantum communication the single photons states are stored and retrieved. By the help of non-classical correlations and the quantum memory a deterministic single photon source is demonstrated. The Hong-Ou-Mandel dip between two single photons created in this way has been measured. Moreover it is reported on the realization of a long-lived quantum memory by using magnetic-field insensitive atomic states in an optical trap and that by extending the spinwave's wavelength the dephasing of the memory due to thermal motion could be suppressed. Measured storage times of over a millisecond represent a significant progress towards the realization of long distance quantum communication.