Wigner current for open quantum systems

Wigner Functions for Arbitrary Quantum Systems.

The possibility of constructing a complete, continuous Wigner function for any quantum system has been a subject of investigation for over 50 years. A key system that has served to illustrate the difficulties of this problem has been an ensemble of spins. Here we present a general and consistent framework for constructing Wigner functions exploiting the underlying symmetries in the physical sys...

Conservation law of operator current in open quantum systems

Probability-current analysis of energy transport in open quantum systems.

We introduce a probability-current analysis of excitation energy transfer between states of an open quantum system. Expressing the energy transfer through currents of excitation probability between the states in a site representation enables us to gain key insights into the energy transfer dynamics. In particular, the analysis yields direct identification of the pathways of energy transport in ...

Wigner distributions for finite dimensional quantum systems: An algebraic approach

S Chaturvedi†∗, E Ercolessi‡, G Marmo§, G Morandi‖, N Mukunda¶ and R Simon †School of Physics, University of Hyderabad, Hyderabad 500 046, India ‡Physics Department, University of Bologna, INFM and INFN, Via Irnerio 46, I-40126, Bologna, Italy §Dipartimento di Scienze Fisiche, University of Napoli and INFN, Via Cinzia, I-80126 Napoli, Italy ‖ Physics Department, University of Bologna, INFM and ...

open quantum systems

Quantum mechanics must be regarded as open systems. On one hand, this is due to the fact that, like in classical physics, any realistic system is subjected to a coupling to an uncontrollable environment which influences it in a non-negligible way. The theory of open quantum systems thus play a major role in many applications of quantum physics since perfect isolation of quantum system is not po...