Echo protocols of an optical quantum memory

TL;DR

This paper provides analytical insights into photon echo quantum memory protocols, examining spectral dispersion, nonlinear interactions, and practical implementation challenges, with potential applications in quantum repeaters.

Contribution

It introduces new analytical solutions for echo protocols, analyzing their efficiency and practical issues in quantum memory applications.

Findings

Spectral dispersion significantly affects broadband quantum storage.

Closed-form solutions describe storage of weak and strong signals.

Identifies conditions for high-efficiency echo protocols under nonlinear interactions.

Abstract

Based on new obtained analytical results, the main properties of photon echo quantum memory protocols are analysed and discussed together with recently achieved experimental results. The main attention is paid to studying the influence of spectral dispersion and nonlinear interaction of light pulses with resonant atoms. The distinctive features of the effect of spectral dispersion on the quantum storage of broadband signal pulses in the studied echo protocols are identified and discussed. Using photon echo area theorem, closed analytical solutions for echo protocols of quantum memory are obtained, describing the storage of weak and intense signal pulses, allowing us to find the conditions for the implementation of high efficiency in the echo protocols under strong nonlinear interaction of signal and control pulses with atoms. The key existing practical problems and the ways to solve them in realistic experimental conditions are outlined. We also briefly discuss the potential of using the considered photon echo quantum memory protocols in a quantum repeater.