300 citations · 1.6k across the 72 of their papers we have counts for
13 papers · 1 filter
False vacuum decay in long-range interacting quantum systems
Valerio Pagni, Laura Batini, Nicolò Defenu
We formulate false-vacuum decay in a mixed-field Ising chain with interactions as a spatially nonlocal Euclidean theory featuring a fractional spatial kinetic term $\…
Robust spin-squeezing with random interaction graphs: the lesson from universality
Andrea Solfanelli, Augusto Smerzi, Peter Zoller +1
We establish the conditions under which scalable spin squeezing can be achieved in interacting spin ensembles embedded in arbitrary, inhomogeneous graph geometries. We identify two…
Freezing and Shielding under Global Quenches for Long-Range Interacting Many-Body Systems
Daniel Arrufat-Vicente, Nicolò Defenu
We investigate the time evolution of a Fermi-Hubbard model with long range hopping following a sudden quench of the local interactions among different spin species. The quasi-parti…
Observables in non-Hermitian systems: A methodological comparison
Karin Sim, Nicolò Defenu, Paolo Molignini +1
Despite acute interest in the dynamics of non-Hermitian systems, there is a lack of consensus in the mathematical formulation of non-Hermitian quantum mechanics in the community. D…
On the Conditions for a Quantum Violent Relaxation
Guido Giachetti, Nicolò Defenu
In general, classical fully-connected systems are known to undergo violent relaxation. This phenomenon refers to the relaxation of observables to stationary, non-thermal, values on…
Universal defects statistics with strong long-range interactions
Stefano Gherardini, Lorenzo Buffoni, Nicolò Defenu
Quasi-static transformations, or slow quenches, of many-body quantum systems across quantum critical points create topological defects. The Kibble-Zurek mechanism regulates the app…
Stabilization of Discrete Time-Crystaline Response on a Superconducting Quantum Computer by increasing the Interaction Range
Andrea Solfanelli, Stefano Ruffo, Sauro Succi +1
The simulation of complex quantum many-body systems is a promising short-term goal of noisy intermediate-scale quantum (NISQ) devices. However, the limited connectivity of native q…
Logarithmic, Fractal and Volume-Law Entanglement in a Kitaev chain with long-range hopping and pairing
Andrea Solfanelli, Stefano Ruffo, Sauro Succi +1
Thanks to their prominent collective character, long-range interactions promote information spreading and generate forms of entanglement scaling, which cannot be observed in tradit…
Quantum Metric Unveils Defect Freezing in Non-Hermitian Systems
Karin Sim, Nicolò Defenu, Paolo Molignini +1
Non-Hermiticity in quantum Hamiltonians leads to nonunitary time evolution and possibly complex energy eigenvalues, which can lead to a rich phenomenology with no Hermitian counter…
Entanglement propagation and dynamics in non-additive quantum systems
Guido Giachetti, Nicolo Defenu
The prominent collective character of long-range interacting quantum systems makes them promising candidates for quantum technological applications. Yet, lack of additivity overthr…
Metastability and discrete spectrum of long-range systems
Nicolò Defenu
Long lived quasi-stationary states (QSSs) are a signature characteristic of long-range interacting systems both in the classical and in the quantum realms. Often, they emerge after…
Quantum adiabatic cycles and their breakdown
Nicolò Defenu
An analytically solvable model for quasi-static transformations across quantum critical points featuring Bosonic quasi-particle excitations is presented. The model proves that adia…
Universal dynamical scaling of long-range topological superconductors
Nicolò Defenu, Giovanna Morigi, Luca Dell'Anna +1
We study the out-of-equilibrium dynamics of -wave superconducting quantum wires with long-range interactions, when the chemical potential is linearly ramped across the topologic…