Identical Photons from Multiple Tin-Vacancy Centers in Diamond

TL;DR

This paper demonstrates the creation of high-quality tin-vacancy centers in diamond that emit nearly identical photons, with very narrow spectral distributions, enabling potential quantum communication applications.

Contribution

It reports the first observation of nearly identical photons from multiple SnV centers in diamond with a very narrow inhomogeneous distribution, showing reliable fabrication of high-quality centers.

Findings

Inhomogeneous distribution as low as ~4 GHz

Observation of isotope-dependent resonant frequencies

Multiple SnV centers emit nearly identical photons

Abstract

We report the narrow inhomogeneous distribution of the zero-phonon line from tin-vacancy (SnV) centers in diamond and the overlap of spectra from multiple separated SnV centers. Photoluminescence excitation spectroscopy measurements at a cryogenic temperature showed that SnV centers exhibit stable fluorescence and linewidths close to the Fourier transform-limited linewidth. The inhomogeneous distribution was as low as ~4 GHz, which enabled the observation of Sn isotope-dependent resonant frequencies. Owing to the narrow inhomogeneous distribution, we observed multiple SnV centers showing identical photons with almost the same wavelength and linewidth. Identical SnV centers were also observed even in different diamond samples, confirming the reliable fabrication of the high-quality SnV centers.