SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 8: Quantum Technologies: Color Centers (joint session Q/A/QI)
A 8.6: Talk
Monday, March 6, 2023, 18:15–18:30, F342
Probing the Orbital Coherence of a Tin-Vacancy Center in a Diamond Nanopillar via Coherent Population Trapping — •Cem Güney Torun1, Joseph H. D. Munns1, Franziska M. Herrmann1, Gregor Pieplow1, Tommaso Pregnolato1,2, and Tim Schröder1,2 — 1Humboldt-Universität zu Berlin, Department of Physics, Berlin, Germany — 2Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany
Tin-vacancy color center in diamond (SnV) has gained much attention in recent years as a promising spin-photon interface. This is mainly due to its excellent optical properties resulting from the inhibited first-order coupling to external electric fields via DC Stark Shifts [1] and millisecond spin coherence through decreased phononic coupling by the large ground state splitting of 850 GHz [2]. Here, we analyze the coherence properties of the ground state orbital levels under zero magnetic field. This is implemented via a coherent population trapping experiment where two optical transitions in a lambda scheme are simultaneously driven and a reduction in the fluorescence signal is observed. Working in the spectral domain enables the extraction of a rapid 5 ps phononic decay time after analyzing the data; showing that the orbital degree of freedom is not particularly suitable for most quantum information processing applications. Finally, implications of orbital coherence times on the spin levels are considered. These experiments lay the basis for the coherent control of SnV spin states.
[1] J. Görlitz, et al. npj Quan. Inf. 8.1 (2022): 1-9.
[2] R. Debroux, et al. Phy. Rev. X 11.4 (2021): 041041.