3 papers
quant-ph2019
An operator derivation of the Feynman-Vernon theory, with applications to the generating function of bath energy changes and to anharmonic baths
Erik Aurell, Ryoichi Kawai, Ketan Goyal
We present a derivation of the Feynman-Vernon approach to open quantum systems in the language of super-operators. We show that this gives a new and more direct derivation of the g…
cond-mat.stat-mech2019
Entropy production of a small quantum system under strong coupling with an environment: A computational experiment
Ketan Goyal, Xian He, Ryoichi Kawai
Many theoretical expressions of dissipation along non-equilibrium processes have been proposed. However, they have not been fully verified by experiments. Especially for systems st…
quant-ph2017
Steady state thermodynamics of two qubits strongly coupled to bosonic environments
Ketan Goyal, Ryoichi Kawai
When a quantum system is placed in thermal environments, we often assume that the system relaxes to the Gibbs state in which decoherence takes place in the system energy eigenbasis…