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Frontiers in Optics

Orbital Coherent Population Trapping with a Tin-Vacancy Color Center

Cem Güney Torun, J. H. D. Munns, Franziska Marie Herrmann, Gregor Pieplow, Tommaso Pregnolato, Tim Schröder

Published Jan 1, 2022• 0 citations
Publisher

Abstract

Tin-vacancy color centers in diamond are promising for quantum communication and information applications. Here, we determine the coherence time of orbital qubit states through coherent population trapping.
DOI
10.1364/fio.2022.fw7b.4

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The coherence characteristics of a tin-vacancy (SnV) color center in diamond are investigated through optical means, including linewidth broadening effects and coherent population trapping (CPT) between the ground-state orbital levels. Spectral analysis is required as due to the large spin-orbit splitting of the orbital ground states, thermalization between the ground states occurs at rates that are impractical to measure directly in the time domain. First, by implementing a temperature-dependent linewidth broadening measurement, including the challenging-to-measure D transition, phononic coupling coefficients are determined. These measurements are performed on an emitter with a lifetime-limited linewidth and atomlike properties, making the measurement representative for high-quality SnVs. Next, a CPT-type experiment is carried out to independently analyze thermal decoherence processes at 4 K. The spectral information is transformed into its conjugate variable time, providing picosecond resolution and revealing an orbital depolarization timescale of ∼ 30 ps . Consequences of the investigated dynamics are then used to estimate spin dephasing times limited by thermal effects.
Many applications in quantum information processing require multiple, identical quantum emitters. Among various color centers in diamond, tin-vacancy centers draw attention because of their high quantum efficiency and long spin coherence. The authors study the shifts of optical-transition frequencies of these centers in an applied electric field, and importantly find that both the linear and quadratic coefficients are orders of magnitude smaller than those of non-inversion-symmetric defects such as nitrogen-vacancy centers. This low susceptibility allows the integration of tin-vacancy centers into photonic nanostructures, which is essential for efficient spin-photon interfaces.