Generation of entangled photon strings using NV centers in diamond

TL;DR

This paper proposes a scheme using NV centers in diamond to generate long strings of entangled photons, including GHZ and cluster states, with potential applications in quantum communication.

Contribution

It introduces a novel method leveraging diamond's nuclear spin to mediate entanglement among multiple photons, extending entangled photon string length.

Findings

Proposed a scheme for generating n-photon GHZ and cluster states.

Estimated entanglement generation rates with and without a cavity.

Presented an experimental setup for implementation.

Abstract

We present a scheme to generate entangled photons using the NV centers in diamond. We show how the long-lived nuclear spin in diamond can mediate entanglement between multiple photons thereby increasing the length of entangled photon string. With the proposed scheme one could generate both n-photon GHZ and cluster states. We present an experimental scheme realizing the same and estimating the rate of entanglement generation both in the presence and absence of a cavity.