Standalone mobile quantum memory system

TL;DR

This paper introduces a portable, standalone quantum memory system using Cesium vapor, demonstrating stable, high-fidelity storage of weak coherent pulses in a non-laboratory environment.

Contribution

It presents the design, implementation, and performance analysis of a self-contained warm vapor quantum memory system with integrated laser and control electronics.

Findings

Stable memory efficiency over time

High storage fidelity at the single-photon level

Operation outside laboratory conditions

Abstract

We present the implementation and performance analysis of a portable, rack-mounted standalone warm vapor quantum memory system, that also includes the laser package, control electronics and data processing hardware. The optical memory is based on long-lived hyperfine ground states of Cesium which are connected to an excited state via the $D_1$ line at 895 nm in a $\Lambda$-configuration. The memory is operated with weak coherent pulses containing on average $<1$ photons per pulse. The long-term stability of the memory efficiency and storage fidelity is demonstrated at the single-photon level together with operation in a non-laboratory environment.