14 papers
Open quantum dynamics without Complete Positivity: a criticism
Fabio Benatti, Dariusz ChruÅciÅski, Saverio Pascazio
The requirement of complete positivity is very often regarded as a fundamental consistency condition for the description of open quantum dynamics. We critically examine this requir…
Multipartite entanglement of random states of qubits
Giorgia Trotta, Paolo Scarafile, Paolo Facchi +5
We investigate multipartite entanglement via the statistical properties of pure quantum states of n-qubits. By analyzing the distribution of purity among balanced bipartitions, we…
Superradiant decay in non-Markovian Waveguide Quantum Electrodynamics
Rosa Lucia Capurso, Giuseppe Calajó, Simone Montangero +5
An array of initially excited emitters coupled to a one-dimensional waveguide exhibits superradiant decay under the Born-Markov approximation, manifested as a coherent burst of pho…
Dynamical cluster-based strategy for improving tensor network algorithms in quantum circuit simulations
Andrea De Girolamo, Paolo Facchi, Peter Rabl +3
We optimize matrix-product state-based algorithms for simulating quantum circuits with finite fidelity, specifically the time-evolving block decimation (TEBD) and the density-matri…
Quantum Dynamics, Master Equation and Equilibrium for a Qubit Coupled to a Thermal Boson Field
Hiromichi Nakazato, Saverio Pascazio
We analytically derive the exact -- though formal -- master equation for a two-level quantum system (qubit) interacting with a bosonic environment within the rotating-wave approxim…
Explicit construction of a 2-design of from the theory of angular momentum
Rocco Maggi, Cosmo Lupo, Saverio Pascazio
The main aim of this work is to present an explicit construction of a 2-design of , relying only on a tool that belongs to every physicists toolbox: the theory of angul…