111 citations · 467 across the 17 of their papers we have counts for
17 papers
Linear Quantum Entropy and Non-Hermitian Hamiltonians
Alessandro Sergi, Paolo V. Giaquinta
We consider the description of open quantum systems with probability sinks (or sources) in terms of general non-Hermitian Hamiltonians.~Within such a framework, we study novel poss…
Quantum entropy of systems described by non-Hermitian Hamiltonians
Alessandro Sergi, Konstantin G. Zloshchastiev
We study the quantum entropy of systems that are described by general non-Hermitian Hamiltonians, including those which can model the effects of sinks or sources. We generalize the…
Embedding quantum systems with a non-conserved probability in classical environments
Alessandro Sergi
Quantum systems with a non-conserved probability can be described by means of non-Hermitian Hamiltonians and non-unitary dynamics. In this paper, the case in which the degrees of f…
Time correlation functions for non-Hermitian quantum systems
Alessandro Sergi, Konstantin G. Zloshchastiev
We introduce a formalism for time-dependent correlation functions for systems whose evolutions are governed by non-Hermitian Hamiltonians of general type. It turns out that one can…
Non-Hamiltonian modeling of squeezing and thermal disorder in driven oscillators
Sashwin Sewran, Konstantin G. Zloshchastiev, Alessandro Sergi
Recently, model systems with quadratic Hamiltonians and time-dependent interactions were studied by Briegel and Popescu and by Galve et al. in order to consider the possibility of…
Comparison and unification of non-Hermitian and Lindblad approaches with applications to open quantum optical systems
Konstantin G. Zloshchastiev, Alessandro Sergi
We compare two approaches to open quantum systems, namely, the non-Hermitian dynamics and the Lindblad master equation. In order to deal with more general dissipative phenomena, we…