Quantum Memory for Microwave Photons in an Inhomogeneously Broadened Spin Ensemble

Brian Julsgaard (1) , Cécile Grezes (2) , Patrice Bertet (2) , Klaus Mølmer (1)

1 Department of Physics and Astronomy [Aarhus]
2 QUANTRONICS - Quantronics Group

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.

Domains: Physics [physics]

Brian Julsgaard, Cécile Grezes, Patrice Bertet, Klaus Mølmer. Quantum Memory for Microwave Photons in an Inhomogeneously Broadened Spin Ensemble. Physical Review Letters, 2013, 110, ⟨10.1103/PhysRevLett.110.250503⟩. ⟨cea-01477724⟩