Two-color quantum memory in double {\Lambda}-media

TL;DR

This paper introduces a quantum memory scheme for single-photon superpositions of two colors using double-{ extLambda} systems and electromagnetically induced transparency, enabling controlled storage and retrieval of photon states.

Contribution

It presents a novel method for storing two-color single-photon states via a double-{ extLambda} system with phase-dependent dynamics and time-dependent control beams.

Findings

Periodic energy exchange between frequency components via four-wave mixing.

Phase-sensitive propagation dynamics.

Successful numerical simulation of storage and retrieval of two-frequency photon qubits.

Abstract

We propose a quantum memory for a single-photon wave packet in a superposition of two different colors, i.e., two different frequency components, using the electromagnetically induced transparency technique in a double-{\Lambda} system. We examine a specific configuration in which the two frequency components are able to exchange energy through a four-wave mixing process as they propagate, so the state of the incident photon is recovered periodically at certain positions in the medium. We investigate the propagation dynamics as a function of the relative phase between the coupling beams and the input single-photon frequency components. Moreover, by considering time-dependent coupling beams, we numerically simulate the storage and retrieval of a two-frequency-component single-photon qubit.