Coherent spin control at the quantum level in an ensemble-based optical memory

Pierre Jobez, Cyril Laplane, Nuala Timoney, Nicolas Gisin, Alban Ferrier, Philippe Goldner, Mikael Afzelius

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79 Citations (Scopus)

Abstract

Long-lived quantum memories are essential components of a long-standing goal of remote distribution of entanglement in quantum networks. These can be realized by storing the quantum states of light as single-spin excitations in atomic ensembles. However, spin states are often subjected to different dephasing processes that limit the storage time, which in principle could be overcome using spin-echo techniques. Theoretical studies suggest this to be challenging due to unavoidable spontaneous emission noise in ensemble-based quantum memories. Here, we demonstrate spin-echo manipulation of a mean spin excitation of 1 in a large solid-state ensemble, generated through storage of a weak optical pulse. After a storage time of about 1 ms we optically read-out the spin excitation with a high signal-to-noise ratio. Our results pave the way for long-duration optical quantum storage using spin-echo techniques for any ensemble-based memory.

Original languageEnglish
Article number230502
Number of pages5
JournalPhysical Review Letters
Volume114
Issue number23
DOIs
Publication statusPublished - 12 Jun 2015
Externally publishedYes

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    Jobez, P., Laplane, C., Timoney, N., Gisin, N., Ferrier, A., Goldner, P., & Afzelius, M. (2015). Coherent spin control at the quantum level in an ensemble-based optical memory. Physical Review Letters, 114(23), [230502]. https://doi.org/10.1103/PhysRevLett.114.230502