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Coherent Spin Control at the Quantum Level in an Ensemble-Based Optical Memory

Ferrier, Alban
Goldner, Philippe
Published in Physical Review Letters. 2015, vol. 114, no. 23, p. 230502
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.
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JOBEZ, Pierre et al. Coherent Spin Control at the Quantum Level in an Ensemble-Based Optical Memory. In: Physical Review Letters, 2015, vol. 114, n° 23, p. 230502. https://archive-ouverte.unige.ch/unige:90518

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Deposited on : 2016-12-19

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