Coupling of a single NV-center in diamond to a fiber-based microcavity

TL;DR

This paper demonstrates the coupling of a single NV-center in diamond to a fiber-based microcavity at room temperature, enabling tunable single photon emission and exploring phonon-assisted cavity feeding.

Contribution

It introduces a novel fiber-based microcavity coupling technique with a single NV-center, revealing new emission regimes and potential for tunable quantum light sources.

Findings

Achieved coupling of NV-center to fiber microcavity at room temperature

Realized a tunable, narrowband single photon source

Predicted transition to Purcell-enhanced emission at low temperatures

Abstract

We report on the coupling of a single Nitrogen-vacancy (NV) center in a nanodiamond to a fiber-based microcavity at room temperature. Investigating the very same NV center inside the cavity and in free-space allows to systematically explore a new regime of phonon-assisted cavity feeding. Making use of the NV center's strongly broadened emission, we realize a widely tunable, narrowband single photon source. A master equation model well reproduces our experimental results and predicts a transition into a Purcell-enhanced emission regime at low temperatures.