Sub-GHz linewidths ensembles of SiV centers in a diamond nano-pyramid revealed by charge state conversion

TL;DR

This paper demonstrates the creation of diamond nano-pyramids with dense ensembles of SiV centers exhibiting near lifetime-limited linewidths, achieved through controlled charge state manipulation, promising advances in quantum optics and sensing.

Contribution

It introduces a method to produce high-density SiV ensembles in diamond nano-pyramids with near lifetime-limited linewidths via charge state control and selective hole burning techniques.

Findings

Achieved near lifetime-limited linewidths in SiV centers.

Demonstrated controlled charge transfer to dark states.

Produced dense ensembles in sub-wavelength volumes.

Abstract

Producing nano-structures with embedded bright ensembles of lifetime-limited emitters is a challenge with potential high impact in a broad range of physical sciences. In this work, we demonstrate controlled charge transfer to and from dark states exhibiting very long lifetimes in high density ensembles of SiV centers hosted in a CVD-grown diamond nano-pyramid. Further, using a combination of resonant photoluminescence excitation and a frequency-selective persistent hole burning technique that exploits such charge state transfer, we could demonstrate close to lifetime-limited linewidths from the SiV centers. Such a nanostructure with thousands of bright narrow linewidth emitters in a volume much below $\lambda^3$ will be useful for coherent light-matter coupling, for biological sensing, and nanoscale thermometry.