Quantum Memory for Microwave Photons in an Inhomogeneously Broadened Spin Ensemble

Brian Julsgaard 1 Cécile Grezes 2 Patrice Bertet 2 Klaus Mølmer 1
2 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : We propose a multi-mode quantum memory protocol able to store the quantum state of the field in a microwave resonator into an ensemble of electronic spins. The stored information is protected against inhomogeneous broadening of the spin ensemble by spin-echo techniques resulting in memory times orders of magnitude longer than previously achieved. By calculating the evolution of the first and second moments of the spin-cavity system variables for realistic experimental parameters, we show that a memory based on NV center spins in diamond can store a qubit encoded on the |0 and |1 Fock states of the field with 80% fidelity.
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Brian Julsgaard, Cécile Grezes, Patrice Bertet, Klaus Mølmer. Quantum Memory for Microwave Photons in an Inhomogeneously Broadened Spin Ensemble. Physical Review Letters, American Physical Society, 2013, 110, ⟨10.1103/PhysRevLett.110.250503⟩. ⟨cea-01477724⟩

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