Open Quantum Systems | 李梓民 Zi-Min Li

Non-Hermitian Physics and Open Quantum Systems

Sat, 01 Aug 2026 00:00:00 +0000

Non-Hermitian physics provides effective descriptions of systems with gain, loss, and environmental coupling. We investigate parity-time-symmetric quantum optical models, exceptional-point structures, and dynamical signatures that go beyond semiclassical treatments.

A complementary focus is open quantum systems, including the effects of two-photon relaxation on quantum Rabi models. We study how environmental coupling and dissipation reshape quantum dynamics and steady states. Effective non-Hermitian descriptions and full open-system evolution are related but distinct tools; their connection depends on the physical setting and the treatment of quantum jumps.

Ongoing research examines dissipative phase transitions, Liouvillian exceptional points, and quantum Mpemba effects. These topics extend our published work on the PT-symmetric quantum Rabi model (2023) and two-photon relaxation (2024).

Enhanced Charging in Open Rabi and Dicke Quantum Batteries

Mon, 21 Sep 2026 00:00:00 +0000

Accepted for publication in Physical Review A on 21 September 2026.

Volume and article number will be added when available.

Research Directions and Our Group

Sat, 13 Apr 2024 00:00:00 +0000

Our group is based in the School of Physics at Central South University. We study how quantum systems exchange energy and information with light fields and their surrounding environments. Our work combines analytical methods, numerical calculations, and physically transparent models.

Our current research has four closely connected themes:

Quantum Rabi models and light-matter interaction. We develop exact and approximate methods for strongly coupled qubit-oscillator systems and investigate their spectra, eigenstates, and dynamics.
Open quantum systems. We study how relaxation, dissipation, and environmental noise reshape quantum dynamics and steady states.
Non-Hermitian physics. We explore parity-time symmetry, exceptional points, and the interplay between gain, loss, and quantum coherence.
Quantum information and energy science. We are interested in entanglement generation, state preparation, and quantum batteries.

Graduate and undergraduate students participate in different parts of these projects, from analytical derivations and numerical simulations to literature review and scientific visualization. We welcome discussions and collaborations in quantum optics and related areas.