Publications (12)
Distillation of Entanglement between Distant Systems by Repeated Measurements on Entanglement Mediator
G. Compagno, A. Messina, H. Nakazato +3
A recently proposed purification method, in which the Zeno-like measurements of a subsystem can bring about a distillation of another subsystem in interaction with the former, is u…
XX model on the circle
A. De Pasquale, G. Costantini, P. Facchi +3
We diagonalize the XX model with a finite number of spins and periodic boundary conditions. We solve for the ground state, focus on the rapidity of the convergence to the thermodyn…
On the Assumption of Initial Factorization in the Master Equation for Weakly Coupled Systems II: Solvable Models
K. Yuasa, S. Tasaki, P. Facchi +4
We analyze some solvable models of a quantum mechanical system in interaction with a reservoir when the initial state is not factorized. We apply Nakajima-Zwanzig's projection meth…
Oscillations of the purity in the repeated-measurement-based generation of quantum states
B. Militello, K. Yuasa, H. Nakazato +1
Repeated observations of a quantum system interacting with another one can drive the latter toward a particular quantum state, irrespectively of its initial condition, because of a…
On the Assumption of Initial Factorization in the Master Equation for Weakly Coupled Systems I: General Framework
S. Tasaki, K. Yuasa, P. Facchi +4
We analyze the dynamics of a quantum mechanical system in interaction with a reservoir when the initial state is not factorized. In the weak-coupling (van Hove) limit, the dynamics…
Influence of dissipation on the extraction of quantum states via repeated measurements
B. Militello, K. Yuasa, H. Nakazato +1
A quantum system put in interaction with another one that is repeatedly measured is subject to a non-unitary dynamics, through which it is possible to extract subspaces. This key i…
Interference in a two-mode Bose system with particles is typical
P. Facchi, H. Nakazato, S. Pascazio +2
When a Bose-Einstein condensate is divided into two parts, that are subsequently released and overlap, interference fringes are observed. We show here that this interference is typ…
Solution of the Lindblad Equation in the Kraus Representation
H. Nakazato, Y. Hida, K. Yuasa +3
The so-called Lindblad equation, a typical master equation describing the dissipative quantum dynamics, is shown to be solvable for finite-level systems in a compact form without r…
Entanglement-assisted tomography of a quantum target
A. De Pasquale, P. Facchi, V. Giovannetti +1
We study the efficiency of quantum tomographic reconstruction where the system under investigation (quantum target) is indirectly monitored by looking at the state of a quantum pro…
Lateral Effects in Fermion Antibunching
K. Yuasa, P. Facchi, H. Nakazato +3
Lateral effects are analyzed in the antibunching of a beam of free non-interacting fermions. The emission of particles from a source is dynamically described in a 3D full quantum f…
Estimation of the Repeatedly-Projected Reduced Density Matrix under Decoherence
H. Nakazato, K. Yuasa, B. Militello +1
Decoherence is believed to deteriorate the ability of a purification scheme that is based on the idea of driving a system to a pure state by repeatedly measuring another system in…
Selective writing and read-out of a register of static qubits
A. De Pasquale, F. Ciccarello, K. Yuasa +1
We propose a setup comprising an arbitrarily large array of static qubits (SQs), which interact with a flying qubit (FQ). The SQs work as a quantum register, which can be written o…