Suppression of Spectral Diffusion by Anti-Stokes Excitation of Quantum Emitters in Hexagonal Boron Nitride

TL;DR

This paper demonstrates that Anti-Stokes excitation in hexagonal boron nitride quantum emitters can suppress spectral diffusion and enable all-optical control of emission energy, advancing quantum photonics applications.

Contribution

It introduces a novel Anti-Stokes excitation method to suppress spectral diffusion and control emission wavelength in hBN quantum emitters.

Findings

Anti-Stokes excitation suppresses spectral diffusion.

All-optical gating can lock emission energy.

Reversible spectral jumps can be controlled.

Abstract

Solid-state quantum emitters are garnering a lot of attention due to their role in scalable quantum photonics. A notable majority of these emitters, however, exhibit spectral diffusion due to local, fluctuating electromagnetic fields. In this work, we demonstrate efficient Anti-Stokes (AS) excitation of quantum emitters in hexagonal boron nitride (hBN), and show that the process results in the suppression of a specific mechanism responsible for spectral diffusion of the emitters. We also demonstrate an all-optical gating scheme that exploits Stokes and Anti-Stokes excitation to manipulate spectral diffusion so as to switch and lock the emission energy of the photon source. In this scheme, reversible spectral jumps are deliberately enabled by pumping the emitter with high energy (Stokes) excitation; AS excitation is then used to lock the system into a fixed state characterized by a fixed emission energy. Our results provide important insights into the photophysical properties of quantum emitters in hBN, and introduce a new strategy for controlling the emission wavelength of quantum emitters.