Quantum memory with a single two-level atom in a half cavity

TL;DR

This paper introduces a quantum memory scheme using a single two-level atom in a half cavity with a moving mirror, enabling efficient storage and retrieval of various photon shapes without extra control lasers.

Contribution

It presents a novel quantum memory method leveraging mirror motion to shape decay rates, eliminating the need for additional control fields.

Findings

Analytical efficiency expression derived

Efficient storage of various photon shapes demonstrated

Feasible implementations discussed

Abstract

We propose a setup for quantum memory based on a single two-level atom in a half cavity with a moving mirror. We show that various temporal shapes of incident photon can be efficiently stored and readout by shaping the time-dependent decay rate $\gamma(t)$ between the atom and the light. This is achieved uniquely by an appropriate motion of the mirror without the need for additional control laser or atomic level. We present an analytical expression for the efficiency of the process and study its dependence on the ratio between the incident light field bandwidth and the atomic decay rate. We discuss possible implementations and experimental issues, particularly for a single atom or ion in a half cavity quantum optical setup as well as a superconducting qubit in the context of circuit QED.