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Storage and retrieval of single photons transmitted between remote quantum memories

2005/11/02 by T. Chaneliere, T. Chanelière, Dzmitry Matsukevich +7 · 25 citations
Computer Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Open quantum system #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum computer #Quantum entanglement #Quantum information #Quantum information science #Quantum mechanics #Quantum network #Quantum optics and atomic interactions #Quantum state #Quantum technology #Qubit #quant-ph

paper · pdf · doi:10.1038/nature04315

published as Nature, 438, 833 (2005) · 15 pages, 6 figures

arxiv created 2005/11/02 · openalex publication_date 2005/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

An elementary quantum network operation involves storing a qubit state in an atomic quantum memory node, and then retrieving and transporting the information through a single photon excitation to a remote quantum memory node for further storage or analysis. Implementations of quantum network operations are thus conditioned on the ability to realize such matter-to-light and/or light-to-matter quantum state mappings. Here, we report generation, transmission, storage and retrieval of single quanta using two remote atomic ensembles. A single photon is generated from a cold atomic ensemble at Site A via the protocol of Duan, Lukin, Cirac, and Zoller (DLCZ) [Nature v.414, 413 (2001)] and is directed to Site B through a 100 meter long optical fiber. The photon is converted into a single collective excitation via the dark-state polariton approach of Fleischhauer and Lukin [Phys. Rev. Lett. v.84, 5094 (2000)]. After a programmable storage time the atomic excitation is converted back into a single photon. This is demonstrated experimentally, for a storage time of 500 nanoseconds, by measurement of an anticorrelation parameter a. Storage times exceeding ten microseconds are observed by intensity cross-correlation measurements. The length of the storage period is two orders of magnitude longer than the time to achieve conversion between photonic and atomic quanta. The controlled transfer of single quanta between remote quantum memories constitutes an important step towards distributed quantum networks.

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