Quantum repeaters require long-lived quantum memories interfaced with telecom-wavelength fiber optics. We design a tapered diamond optomechanical cavity me-chanically coupled to a Group IV spin and propose its operation in heralded quantum en-tanglement.

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Telecom-Integrated Photonic Memory Operating Near the Mechanical Ground State

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arXiv:2102.04597 · Nature Physics

Optomechanical interface between telecom photons and spin quantum memory

Prasoon Kumar Shandilya, David P. Lake, Matthew J Mitchell, Денис Дмитриевич Сукачев, Paul E. Barclay

Published Oct 14, 2021• 79 citations

arXiv HTML PDF

DOI: 10.1038/s41567-021-01364-3

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{V}_{{\rm{mech}}}/{\Lambda }_{{\rm{p}}}^{3} \sim 1{0}^{-5}

and Vopt/λ3 ~ 10−3, respectively. This confinement boosts the spin-mechanical coupling rate of Group-IV silicon vacancy (SiV−) centers by an order of magnitude to ~ 32 MHz while retaining high acousto-optical couplings. The optical cavity couples to the spin irrespective of the emitter’s native excited states, avoiding spectral diffusion. Using Quantum Monte Carlo simulations, we estimate heralded entanglement fidelities exceeding 0.96 between two such interfaces. We anticipate broad utility beyond diamond emitter-telecom systems to most solid-state quantum memories.