Related papers: Investigating the fast spectral diffusion of a quantum emitter in hBN using resonant excitation and photon correlations

Investigating the fast spectral diffusion of a quantum emitter in hBN using resonant excitation and photon correlations

URL: http://arxiv.org/abs/2303.05315v3
Date: Thu, 25 May 2023 14:27:00 GMT
Title: Investigating the fast spectral diffusion of a quantum emitter in hBN using resonant excitation and photon correlations
Authors: Clarisse Fournier, Kenji Watanabe, Takashi Taniguchi, St\'ephanie Buil, Julien Barjon, Jean-Pierre Hermier, Aymeric Delteil
Abstract summary: We show that a combination of resonant laser excitation and second-order photon correlations allows to access fast dynamics. We experimentally implement this method to investigate the fast spectral diffusion of a color center generated by an electron beam in the two-dimensional material boron nitride.
Score: 0.9605517200038842
License: http://creativecommons.org/licenses/by/4.0/
Abstract: The ability to identify and characterize homogeneous and inhomogeneous dephasing processes is crucial in solid-state quantum optics. In particular, spectral diffusion leading to line broadening is difficult to evidence when the associated timescale is shorter than the inverse of the photon detection rate. Here, we show that a combination of resonant laser excitation and second-order photon correlations allows to access such fast dynamics. The resonant laser drive converts spectral diffusion into intensity fluctuations, leaving a signature in the second-order coherence function $g^{(2)}(\tau)$ of the scattered light that can be characterized using two-photon coincidences -- which simultaneously provides the homogeneous dephasing time. We experimentally implement this method to investigate the fast spectral diffusion of a color center generated by an electron beam in the two-dimensional material hexagonal boron nitride. The $g^{(2)}(\tau)$ function of the quantum emitter measured over more than ten orders of magnitude of delay times, at various laser powers, establishes that the color center experiences spectral diffusion at a characteristic timescale of a few tens of microseconds, while emitting Fourier-limited single photons ($T_2/2T_1 \sim 1$) between spectral jumps.

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