Quantum networks based on color centers in diamond

TL;DR

This paper reviews the potential of color centers in diamond for quantum networks, highlighting current experiments, challenges in control and coherence, and future integration and application prospects.

Contribution

It provides a comprehensive overview of the state-of-the-art and future directions for using diamond color centers in quantum network nodes and devices.

Findings

Current quantum network experiments with diamond color centers demonstrate feasibility.

Challenges in maintaining qubit coherence and control are identified.

Future integration with photonic materials could enable scalable quantum networks.

Abstract

With the ability to transfer and process quantum information, large-scale quantum networks will enable a suite of fundamentally new applications, from quantum communications to distributed sensing, metrology, and computing. This perspective reviews requirements for quantum network nodes and color centers in diamond as suitable node candidates. We give a brief overview of state-of-the-art quantum network experiments employing color centers in diamond, and discuss future research directions, focusing in particular on the control and coherence of qubits that distribute and store entangled states, and on efficient spin-photon interfaces. We discuss a route towards large-scale integrated devices combining color centers in diamond with other photonic materials and give an outlook towards realistic future quantum network protocol implementations and applications.