# High efficiency photonic storage of single photons in cold atoms

## TL;DR

This paper demonstrates a highly efficient quantum storage of single photons in cold atoms, achieving 65% efficiency with preserved nonclassical properties, advancing quantum information processing capabilities.

## Contribution

The study integrates a controllable single photon source with optimized atomic ensemble storage to surpass 50% efficiency threshold for quantum storage.

## Key findings

- Achieved 65% storage efficiency for single photons
- Verified nonclassical nature of retrieved photons
- Demonstrated compatibility with quantum information processing

## Abstract

An efficient quantum storage is highly desired for quantum information processing. As indicated by certain applications, a universal quantum storage is required to have a storage efficiency above 50% to beat the no-cloning limit. Although significant progress has been achieved in improving various quantum storage, the best storage efficiency of single photons is still below this criteria. By integrating a highly controllable single photon source with an optimized quantum storage, here we demonstrate an optical storage of single photons with storage efficiency of 65% in a cold atomic ensemble based on electromagnetically induced transparency. Meanwhile, the nonclassical characteristics of our storage are verified through the well-maintained nonclassical and single photon nature of the retrieved single photons.