Quantum storage based on controllable frequency comb

TL;DR

This paper proposes an all-optical quantum memory scheme using a controllable frequency comb formed by multiple control beams, enabling efficient storage, retrieval, and processing of single photons by combining Raman, GEM, and AFC techniques.

Contribution

It introduces a novel hybrid quantum storage method that integrates Raman, gradient echo memory, and atomic frequency comb approaches in a controllable all-optical setup.

Findings

Demonstrates a flexible, controllable quantum memory platform.

Combines advantages of multiple quantum memory techniques.

Enables advanced single-photon processing functionalities.

Abstract

We suggest an all-optical scheme for the storage, retrieval and processing of a single-photon wave packet through its off-resonant Raman interaction with a series of coherent control beams. These control beams, each with distinct carrier frequency, are distributed along the way of single-photon propagation, thus effectively forming a gradient absorption structure which can be controlled in various ways to achieve different single-photon processing functionalities. Such a controllable frequency comb is a hybrid of Raman, gradient echo memory (GEM) and atomic frequency comb (AFC) methods, therefore demonstrates many of their advantages all together in one.