Telecom photon interface of solid-state quantum nodes

TL;DR

This paper proposes a scheme to efficiently couple telecom-wavelength photons with NV center ensembles using rare-earth doped crystals, enabling long-distance quantum networks with high fidelity.

Contribution

It introduces a novel protocol for high fidelity quantum state transfer and entanglement generation bridging NV centers and telecom photons.

Findings

Protocols are feasible with current technology parameters.

The scheme significantly reduces photon loss in quantum communication.

It advances the development of long-range quantum networks.

Abstract

Solid-state spins such as nitrogen-vacancy (NV) center are promising platforms for large-scale quantum networks. Despite the optical interface of NV center system, however, the significant attenuation of its zero-phonon-line photon in optical fiber prevents the network extended to long distances. Therefore a telecom-wavelength photon interface would be essential to reduce the photon loss in transporting quantum information. Here we propose an efficient scheme for coupling telecom photon to NV center ensembles mediated by rare-earth doped crystal. Specifically, we proposed protocols for high fidelity quantum state transfer and entanglement generation with parameters within reach of current technologies. Such an interface would bring new insights into future implementations of long-range quantum network with NV centers in diamond acting as quantum nodes.