Collective atom phase-controlled noise-free photon echoes using double rephasing and optical locking

TL;DR

This paper presents a novel noise-free photon echo scheme for quantum memory that employs collective atom phase control, double rephasing, and optical locking to achieve inversion-free, extended, and ordered photon echoes.

Contribution

It introduces a new photon echo method combining double rephasing and optical locking for improved quantum memory performance.

Findings

Achieved noise-free, inversion-free photon echoes.

Extended storage time of photon echoes.

Produced normally ordered and intensity-flattened echoes.

Abstract

Using collective atom phase control a population inversion-free photon echo scheme has been studied for quantum memory applications. For the inversion-free photon echoes a double rephasing method is combined with optical locking, where the optical locking coherently controls each atom phase excited by weak data pulses. As a result, intensity flattened, normally ordered, storage time-extended, and noise-free photon echoes are obtained.