136 citations · 1.7k across the 104 of their papers we have counts for
103 papers
Hermitian and unitary almost-companion matrices of polynomials on demand
L. A. Markovich, A. Migliore, A. Messina
We introduce the concept of Almost-Companion Matrix (ACM) by relaxing the non-derogatory property of the standard Companion Matrix (CM). That is, we define an ACM as a matrix whose…
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…
Quantum phase transitions for an integrable quantum Rabi-like model with two interacting qubits
Roberto Grimaudo, Antonio S. M. de Castro, Antonino Messina +2
A two-interacting-qubit quantum Rabi-like model with vanishing transverse fields on the qubit-pair is studied. Independently of the coupling regime, this model can be exactly and u…
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…
Spin-chain-star systems: entangling multiple chains of spin qubits
R. Grimaudo, A. S. M. de Castro, A. Messina +1
We consider spin-chain-star systems characterized by N-wise many-body interactions between the spins in each chain and the central one. We show that such systems can be exactly map…
Greenberger-Horne-Zeilinger state generation in qubit-chains via a single -pulse
Roberto Grimaudo, Nikolay V. Vitanov, Antonio Sergio Magalaes de Castro +2
A protocol for generating Greenberger-Horne-Zeilinger states in a system of coupled qubits is proposed. The Hamiltonian model assumes -wise interactions between the qubi…