Efficient spatially-resolved multimode quantum memory

TL;DR

This paper introduces a method for efficient, multimode quantum memory that stores multiple frequency-encoded qubits in a single ensemble, with selective retrieval and applicability to various experimental setups.

Contribution

It presents a novel approach enabling multimode quantum memory with frequency encoding, applicable to EIT and Raman scattering based systems.

Findings

Enables storage of multiple frequency-encoded qubits in one ensemble

Allows selective retrieval of stored quantum information

Applicable to both EIT and Raman scattering setups

Abstract

We propose a method that enables efficient storage and retrieval of a photonic excitation stored in an ensemble quantum memory consisting of Lambda-type absorbers with non-zero Stokes shift. We show that this can be used to implement a multimode quantum memory storing multiple frequency-encoded qubits in a single ensemble, and allowing their selective retrieval. The read-out scheme applies to memory setups based on both electromagnetically-induced transparency and stimulated Raman scattering, and spatially separates the output signal field from the control fields.