7th SmoleQ Greeting Seminar (2025.04.17 at 17:00 (JST))

 

Speaker: 

Jhen-Dong Lin

Title: 

Non-Markovian Quantum Exceptional Points.

Abstract:

Exceptional points (EPs) are singularities in the spectra of non-Hermitian operators, where eigenvalues and eigenvectors coalesce. Recently, open quantum systems have been increasingly explored as testbeds for quantum EPs due to their natural non-Hermitian nature. However, existing works mostly focus on the Markovian limit, leaving a gap in understanding EPs in the non-Markovian regime. In this talk, I will present our new results, where we address this gap by proposing a theoretical framework based on two numerically exact descriptions of non-Markovian dynamics: the pseudomode mapping and the hierarchical equations of motion.