Multiplexed color centers in a silicon photonic cavity array

TL;DR

This paper presents a silicon photonic platform with coupled cavity arrays hosting color centers, enabling frequency-multiplexed and cavity-enhanced entanglement distribution for quantum networks.

Contribution

It introduces a scalable silicon photonics platform with bus-coupled cavities for multiplexed and cavity-enhanced quantum communication using color centers.

Findings

Demonstrated frequency-multiplexed operation of two T centers.

Showed cavity enhancement through hybridized modes between distant cavities.

Proposed platform enables efficient on-chip and long-distance entanglement distribution.

Abstract

Entanglement distribution is central to the modular scaling of quantum processors and establishing quantum networks. Color centers with telecom-band transitions and long spin coherence times are suitable candidates for long-distance entanglement distribution. However, high-bandwidth memory-enhanced quantum communication is limited by high-yield, scalable creation of efficient spin-photon interfaces. Here, we develop a silicon photonics platform consisting of arrays of bus-coupled cavities. The coupling to a common bus waveguide enables simultaneous access to individually addressable cavity-enhanced T center arrays. We demonstrate frequency-multiplexed operation of two T centers in separate photonic crystal cavities. In addition, we investigate the cavity enhancement of a T center through hybridized modes formed between physically distant cavities. Our results show that bus-coupled arrays of cavity-enhanced color centers could enable efficient on-chip and long-distance entanglement distribution.