Storing short single-photon-level optical pulses in Bose-Einstein condensates for high-performance quantum memory

TL;DR

This paper demonstrates a high-performance quantum memory using Bose-Einstein condensates and the Autler-Townes-splitting protocol, enabling efficient, low-noise storage of short single-photon pulses with long coherence times.

Contribution

It introduces a novel approach combining ATS protocol with BECs for quantum memory, achieving high speed, efficiency, and long storage times.

Findings

30% storage efficiency for 20 ns pulses

15 microseconds memory lifetime

Low-noise, high-speed quantum storage

Abstract

Large-scale quantum networks require quantum memories featuring long-lived storage of non-classical light together with efficient, high-speed and reliable operation. The concurrent realization of these features is challenging due to inherent limitations of matter platforms and light-matter interaction protocols. Here, we propose an approach to overcome this obstacle, based on the implementation of the Autler-Townes-splitting (ATS) quantum-memory protocol on a Bose-Einstein condensate (BEC) platform. We demonstrate a proof-of-principle of this approach by storing short pulses of single-photon-level light as a collective spin-excitation in a rubidium BEC. For 20 ns long-pulses, we achieve an ultra-low-noise memory with an efficiency of 30% and lifetime of 15 $\mu$s. The non-adiabatic character of the ATS protocol (leading to high-speed and low-noise operation) in combination with the intrinsically large atomic densities and ultra-low temperatures of the BEC platform (offering highly efficient and long-lived storage) opens up a new avenue towards high-performance quantum memories.