Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Color Centers III
Q 43.3: Talk
Thursday, March 14, 2024, 11:30–11:45, Aula
Investigation of microwave spin control of unstrained negatively charged group-IV color centers in diamond — •Mohamed Belhassen1, Gregor Pieplow1, and Tim Schröder1,2 — 1Humboldt-Universitatt zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institut, Berlin, Germany
Microwave control is a standard technique for manipulating the electronic spin of diamond color centers owing to its advantages when implementing complex control sequences. For microwave control, a dc magnetic field is used to lift the spin degeneracy. An ac microwave pulse drives the system. Aligning the dc field parallel to the color center’s symmetry axis and the ac field perpendicular to it has been commonly used in previous works. This configuration, although working well for the light color centers, has been shown to require high strain or large microwave powers for heavier ions, such as the tin- and lead-vacancy center. In addition to providing the theoretical framework to explain the requirement of strain for heavy defects in the above field configuration, we study the dependence of the Rabi frequency on the dc and ac fields orientations and strain. We provide analytical expressions and exact numerical simulations of the impact of strain and field orientations on microwave control. We find that strain can be rendered obsolete, while simultaneously producing higher Rabi frequencies for an alternative setup, where the dc field is aligned perpendicular to the color center symmetry axis and the ac field is aligned parallel to it. We show that this configuration is also efficient for the spin’s optical initialization, readout and analyse resulting gate fidelities.
Keywords: Diamond color centers; Microwave spin control; Strain; Rabi frequency