Atomic-ensemble-based quantum memory for sideband modulations

Abstract

Interaction of a control and a signal field with an ensemble of three-level atoms allows direct mapping of the quantum state of the signal field into long lived coherences of an atomic ground state. For a vapor of cesium atoms, using Electromagnetically Induced Transparency (EIT) and Zeeman coherences, we compare the case where a tunable single-sideband is stored independently of the other one to the case where the two symmetrical sidebands are stored using the same transparency window. We study the conditions in which simultaneous storage of two non-commuting variables carried by light and subsequent read-out is possible. We show that excess noise associated with spontaneous emission and spin relaxation is small, and we evaluate the quantum performance of our memory by measuring the signal transfer coefficient T and the conditional variance V and using the T-V criterion as a state independent benchmark.

References in corpus (9)

• The Quantum Internet
• Experimental demonstration of quantum memory for light
• Mapping photonic entanglement into and out of a quantum memory
• Quantum memory for squeezed light
• A millisecond quantum memory for scalable quantum networks
• Photon storage in Lambda-type optically dense atomic media. II. Free-space model
• Memory-built-in quantum teleportation with photonic and atomic qubits
• Reversible Quantum Interface for Tunable Single-sideband Modulation
• Towards experimental entanglement connection with atomic ensembles in the single excitation regime