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QI: Fachverband Quanteninformation
QI 43: Open Quantum Systems II (joint session Q/QI)
QI 43.6: Vortrag
Freitag, 14. März 2025, 12:15–12:30, HS I
Exploring non-Markovian dynamics in microwave spin control of group-IV color centers coupled to a phononic bath — •Mohamed Belhassen1, Gregor Pieplow1, and Tim Schröder1,2 — 1Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand- Braun-Institut, Berlin, Germany
Microwave control is a well-established technique for driving the electronic spin of diamond color centers. In our earlier work [1], we demonstrated that optimizing the orientation of the static magnetic field lifting the spin degeneracy and the polarization of the microwave field driving the spin, is essential for achieving efficient control conditions in a low strain environment. Expanding on this, we now incorporate the phononic bath, which introduces decay and decoherence to the qubit’s quantum state. We examine the system dynamics using both Markovian and non-Markovian master equations, revisiting the interplay between magnetic and microwave field orientations and applied strain, with a focus on their impact on the qubit decay and decoherence times. We interpret our simulation results and compare them with the most recent experimental results. Finally, we assess the validity of the Born-Markov approximation and investigate how bath memory effects impact quantum state evolution.
[1] G. Pieplow, M. Belhassen, T. Schröder, Phys. Rev. B 109, 115409
Keywords: Non-Markovian master equation; Phononic bath; Strain; Microwave spin control; Diamond color centers