Increasing efficiency of quantum memory based on atomic frequency combs

TL;DR

This paper proposes a method to enhance quantum memory efficiency using atomic frequency combs by re-sending the prompt pulse for interference with delayed pulses, significantly improving storage performance.

Contribution

It introduces a novel protocol that increases AFC quantum memory efficiency through pulse re-sending and interference, a new approach in quantum storage techniques.

Findings

Efficiency of AFC quantum memory is significantly increased.

Interference of pulses enhances storage performance.

The protocol is practical for quantum communication applications.

Abstract

A protocol, which essentially increases the efficiency of the quantum memory based on the atomic frequency comb (AFC), is proposed. It is well known that a weak short pulse, transmitted trough a medium with a periodic structure of absorption peaks separated by transparency windows (AFC), is transformed into prompt and delayed pulses. Time delay is equal to the inverse value of the frequency period of the peaks. It is proposed to send the prompt pulse again through the medium and to make both delayed pulses to interfere. This leads to the essential increase of the efficiency of the AFC storage protocol.