Storage and retrieval of microwave fields at the single-photon level in a spin ensemble

Abstract

We report the storage of microwave pulses at the single-photon level in a spin-ensemble memory consisting of $10^{10}$ NV centers in a diamond crystal coupled to a superconducting LC resonator. The energy of the signal, retrieved $100\mu \mathrm{s}$ later by spin-echo techniques, reaches $0.3\%$ of the energy absorbed by the spins, and this storage efficiency is quantitatively accounted for by simulations. This figure of merit is sufficient to envision first implementations of a quantum memory for superconducting qubits.

6 pages

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• On-Chip Detection of Electronuclear Transitions in the ${}^{155,157}$Gd Multilevel Spin System
• Single Spin Detection with Entangled States
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