24 citations · 105 across the 10 of their papers we have counts for
10 papers
Time-Irreversible Quantum-Classical Dynamics of Molecular Models in the Brain
Alessandro Sergi, Antonino Messina, Rosalba Saija +4
This manuscript aims to illustrate a quantum-classical dissipative theory (suited to be converted to effective algorithms for numerical simulations) within the long-term project of…
Thermodynamic Limit in the Two-qubit Quantum Rabi Model with Spin-Spin Coupling
R. Grimaudo, G. Falci, A. Messina +4
The occurrence of a second-order superradiant quantum phase transition is brought to light in a quantum system consisting of two interacting qubits coupled to the same quantized fi…
A Quantum-Classical Model of Brain Dynamics
Alessandro Sergi, Antonino Messina, Carmelo M. Vicario +1
The study of the human psyche has elucidated a bipartite structure of cognition reflecting the quantum-classical nature of any process that generates knowledge and learning governe…
Spin-spin coupling-based quantum and classical phase transitions in two-impurity spin-boson models
Roberto Grimaudo, Antonino Messina, Hiromichi Nakazato +2
The class of two-interacting-impurity spin-boson models with vanishing transverse fields on the spin-pair is studied. The model can be exactly mapped into two independent standard…
Evolution of a Non-Hermitian Quantum Single-Molecule Junction at Constant Temperature
Andrea Grimaldi, Alessandro Sergi, Antonino Messina
This work concerns the theoretical description of the quantum dynamics of molecular junctions with thermal fluctuations and probability losses To this end, we propose a theory for…
New approach to describe two coupled spins in a variable magnetic field
Yuri Belousov, Roberto Grimaudo, Antonino Messina +2
We propose a method to describe the evolution of two spins coupled by hyperfine interaction in an external time-dependent magnetic field. We apply the approach to the case of hyper…
Two-qubit entanglement generation through non-Hermitian Hamiltonians induced by repeated measurements on an ancilla
R. Grimaudo, A. Messina, A. Sergi +2
In contrast to classical systems, actual implementation of non-Hermitian Hamiltonian dynamics for quantum systems is a challenge because the processes of energy gain and dissipatio…
Proposal of a computational approach for simulating thermal bosonic fields in phase space
Alessandro Sergi, Roberto Grimaudo, Gabriel Hanna +1
When a quantum field is in contact with a thermal bath, the vacuum state of the field may be generalized to a thermal vacuum state, which takes into account the thermal noise. In t…
Clusterization of weakly-interacting bosons in one dimension: an analytic study at zero temperature
S. Prestipino, A. Sergi, E. Bruno
We study a system of penetrable bosons on a line, focusing on the high-density/weak-interaction regime, where the ground state is, to a good approximation, a condensate. Under comp…
Quasi-Lie Brackets and the Breaking of Time-Translation Symmetry for Quantum Systems Embedded in Classical Baths
Alessandro Sergi, Gabriel Hanna, Roberto Grimaudo +1
Many open quantum systems encountered in both natural and synthetic situations are embedded in classical-like baths. Often, the bath degrees of freedom may be represented in terms…