Quantum storage based on the control field angular scanning

TL;DR

This paper proposes a novel quantum storage method using angular scanning of a control field in a three-level atomic medium, enabling reversible mapping of single-photon states without inhomogeneous broadening.

Contribution

It introduces a new quantum storage scheme based on control field angular scanning, avoiding the need for inhomogeneous broadening or amplitude manipulation.

Findings

Reversible mapping of single-photon wave packets achieved.

Quantum storage and retrieval without inhomogeneous broadening.

Mathematically analogous to controlled reversible inhomogeneous broadening scheme.

Abstract

Continuous change of the propagation direction of a classical control field in the process of its off-resonant Raman interaction with a weak signal field in a three-level atomic medium is suggested for quantum storage of a single-photon wave packet. It is shown that due to phase matching condition such an angular control allows one to reversibly map the single-photon wave packet to the Raman spatial coherence grating. Thus, quantum storage and retrieval can be realized without using inhomogeneous broadening of the atomic transitions or manipulating the amplitude of the control field. Under some conditions the proposed scheme proves to be mathematically analogous to the quantum storage scheme based on controlled reversible inhomogeneous broadening of the atomic states.