High-efficiency, high-speed, and low-noise photonic quantum memory

TL;DR

This paper demonstrates a photonic quantum memory with over 95% efficiency, 880 GHz bandwidth, and extremely low noise, advancing practical quantum communication and processing capabilities.

Contribution

It introduces a novel approach using controllable collisional dephasing in neutral barium vapor to achieve high efficiency, bandwidth, and low noise in quantum memory.

Findings

Achieved >95% storage efficiency

Demonstrated 880 GHz bandwidth for photons

Maintained low noise with 10^-5 photons per pulse

Abstract

We present a demonstration of simultaneous high-efficiency, high-speed, and low-noise operation of a photonic quantum memory. By leveraging controllable collisional dephasing in a neutral barium atomic vapor, we demonstrate a significant improvement in memory efficiency and bandwidth over existing techniques. We achieve greater than 95% storage efficiency and 26% total efficiency of 880 GHz bandwidth photons, with $\mathcal{O}(10^{-5})$ noise photons per retrieved pulse. These ultrabroad bandwidths enable rapid quantum information processing and contribute to the development of practical quantum memories with potential applications in quantum communication, computation, and networking.