# Nanophotonic quantum storage at telecommunications wavelength

## TL;DR

This paper demonstrates on-chip quantum storage of telecommunications wavelength light using erbium-167 ions in a nanobeam resonator, achieving high bandwidth, fidelity, and multimode capacity for quantum networks.

## Contribution

It introduces a novel on-chip quantum memory platform operating at telecom wavelengths with demonstrated storage times and multimode capabilities.

## Key findings

- Storage times up to 10 microseconds achieved
- High fidelity and bandwidth demonstrated
- Multimode capacity confirmed

## Abstract

Quantum memories for light are important components for future long distance quantum networks. We present on-chip quantum storage of telecommunications band light at the single photon level in an ensemble of erbium-167 ions in an yttrium orthosilicate photonic crystal nanobeam resonator. Storage times of up to 10 $\mu$s are demonstrated using an all-optical atomic frequency comb protocol in a dilution refrigerator under a magnetic field of 380 mT. We show this quantum storage platform to have high bandwidth, high fidelity, and multimode capacity, and we outline a path towards an efficient erbium-167 quantum memory for light.