Nanodiamonds with photostable, sub-gigahertz linewidths quantum emitters

TL;DR

This paper reports on the development of bright, polarized near-infrared single photon emitters in diamond nanocrystals with ultra-narrow linewidths, promising for quantum information applications.

Contribution

It introduces a new near-infrared color center in nanodiamonds with sub-GHz linewidths and stable optical properties at low temperatures.

Findings

Achieved narrow, sub-GHz linewidths at 10K.

Demonstrated stable zero phonon line at ~780 nm.

Showed power-dependent blue shift of emission.

Abstract

Single photon emitters with narrow linewidths are highly sought after for applications in quantum information processing and quantum communications. In this letter, we report on a bright, highly polarized near infrared single photon emitter embedded in diamond nanocrystals with a narrow, sub GHz optical linewidths at 10K. The observed zero phonon line at ~ 780 nm is optically stable under low power resonant excitation and blue shifts as the excitation power increases. Our results highlight the prospect for using new near infrared color centers in nanodiamonds for quantum applications.