3 papers
quant-ph2026
Normal-ordered perturbative expansion for matter systems interacting with continuous-mode quantum photon fields
Liwen Ko, Robert L. Cook, K. Birgitta Whaley
We develop a normal-ordered perturbative expansion method to compute the reduced dynamics of a matter system interacting with a general continuous-mode photon field state. In this…
quant-ph2026
Input-output formulation of quantum light spectroscopy
Liwen Ko, Robert L. Cook, K. Birgitta Whaley
We develop an input-output formulation of quantum light spectroscopy (QLS) by combining the input-output theory, commonly used in quantum optics, with the perturbative expansion me…
quant-ph2025
Optimal sensing on an asymmetric exceptional surface
Robert L. Cook, Liwen Ko, K. Birgitta Whaley
We study the connection between exceptional points (EPs) and optimal parameter estimation, in a simple system consisting of two counter-propagating traveling wave modes in a micror…