Abstract:
How do quantum systems behave when strongly coupled to their environments? Our nonperturbative Effective Hamiltonian method offers analytical insights into the physics of strong coupling, while remaining computationally feasible. After outlining the core principles of this approach, I will present a recent application examining the nonadditive influence of two distinct environments on a quantum system. At strong coupling, frustration effects emerge, leading to nontrivial phenomena: the suppression of relaxation dynamics by decoherence [1], and conversely, the stabilization of quantum coherence due to interaction with a dissipative bath [2].
1. Open quantum systems with noncommuting coupling operators: An analytic approach,
Garwoła, D. Segal, Physical Review B 110, 174304 (2024).
2. Suppression of decoherence dynamics by a dissipative bath at strong coupling,
J. Chen, J. Garwoła, D. Segal, arXiv:2504.02796