Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 9: Open Quantum Systems and Spin-Boson Systems I
Q 9.5: Talk
Monday, March 2, 2026, 18:00–18:15, P 4
Identifying the limitations of the Born-Markov approximation in spin-phonon bath system — •Mohamed Belhassen1, Gregor Pieplow1, and Tim Schröder1,2 — 1Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institut, Berlin, Germany
Diamond color centers are a promising platform for quantum information processing. In particular, we focus on group-IV vacancies as candidates for implementing long-lived quantum memories. To better understand phonon-induced decoherence, we study the quantum master equation of the system including spin-phonon interactions at finite temperature. Due to the complexity of this problem, this equation is typically derived under the Born-Markov approximation. However, this approximation leads to a significant discrepancy between theoretically predicted and experimentally measured coherence times. In this work, we aim to improve the theoretical prediction by analyzing the validity of the Born-Markov approximation and comparing it with non-Markovian approaches.
Keywords: Born-Markovian approximation; Non-Markovian master equation; Phonon bath; Diamond color centers