Cavity-enhanced storage in an optical spin-wave memory

Abstract

We report on the experimental demonstration of an optical spin-wave memory, based on the atomic frequency comb (AFC) scheme, where the storage efficiency is strongly enhanced by an optical cavity. The cavity is of low finesse, but operated in an impedance matching regime to achieve high absorption in our intrinsically low-absorbing Eu3+:Y2SiO5 crystal. For storage of optical pulses as an optical excitation (AFC echoes), we reach efficiencies of 53% and 28% for 2 and 10 microseconds delays, respectively. For a complete AFC spin-wave memory we reach an efficiency of 12%, including spin-wave dephasing, which is a 12-fold increase with respect to previous results in this material. This result is an important step towards the goal of making efficient and long-lived quantum memories based on spin waves, in the context of quantum repeaters and quantum networks.

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Cited by in corpus (4)

• Coherent spin control at the quantum level in an ensemble-based optical memory
• Interfacing GHz-bandwidth heralded single photons with a room-temperature Raman quantum memory
• The observation of photon echoes from evanescently coupled rare-earth ions in a planar waveguide
• Tm${}^{3+}$:Y${}_3$Ga${}_5$O${}_{12}$ materials for spectrally multiplexed quantum memories