Toward a Quantum Memory in a Fiber Cavity Controlled by Intracavity Frequency Translation

TL;DR

This paper introduces a fiber-cavity quantum memory that uses intracavity frequency translation to trap and release photons, achieving high efficiency and storing quantum states for hundreds of nanoseconds.

Contribution

It presents a novel quantum memory protocol utilizing intracavity frequency translation in a fiber cavity, enabling efficient storage and retrieval of quantum states.

Findings

Stored quantum-level THz-bandwidth coherent states for 200 ns.

Achieved a maximum overall efficiency of 73%.

Demonstrated control of photon resonance via intracavity frequency translation.

Abstract

We propose a quantum memory protocol based on trapping photons in a fiber-integrated cavity, comprised of a birefringent fiber with dichroic reflective end facets. Photons are switched into resonance with the fiber cavity by intracavity Bragg-scattering frequency translation, driven by ancillary control pulses. After the storage delay, photons are switched out of resonance with the cavity, again by intracavity frequency translation. We demonstrate storage of quantum-level THz-bandwidth coherent states for a lifetime up to 16 cavity round trips, or 200ns, and a maximum overall efficiency of 73%.