Publications by Vincenzo Savona

Observation of first- and second-order dissipative phase transitions in a two-photon driven Kerr resonator

Vincenzo Savona, Simone Frasca, Guillaume Beaulieu, Pasquale Scarlino, Fabrizio Minganti

In open quantum systems, dissipative phase transitions (DPTs) emerge from the interplay between unitary evolution, drive, and dissipation. While second-order DPTs have been predominantly investigated theoretically, first-order DPTs have been observed in si ...

2025

Neural Projected Quantum Dynamics: a systematic study

Vincenzo Savona, Luca Gravina

We investigate the challenge of classical simulation of unitary quantum dynamics with variational Monte Carlo approaches, addressing the instabilities and high computational demands of existing methods. By systematically analyzing the convergence of stocha ...

Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften2025

Landau–Zener without a qubit: multiphoton sidebands interaction and signatures of dissipative quantum chaos

Vincenzo Savona, Pasquale Scarlino, Vincent Jean Yves Jouanny, Fabrizio Minganti, Marco Scigliuzzo

Landau–Zener–Stückelberg–Majorana (LZSM) interference occurs when qubit parameters are periodically modulated across avoided level crossings. We explore this phenomenon in nonlinear multilevel bosonic systems, where interference is influenced by multiple e ...

2025

Dissipative quantum chaos unveiled by stochastic quantum trajectories

Vincenzo Savona, Luca Gravina, Pasquale Scarlino, Fabrizio Minganti, Debbie Eeltink

We define quantum chaos and integrability in open quantum many-body systems as a dynamical property of single stochastic realizations, referred to as quantum trajectories. This definition relies on the predictions of random matrix theory applied to the sub ...

AMER PHYSICAL SOC2025

Low-Rank Variational Quantum Algorithm for the Dynamics of Open Quantum Systems

Vincenzo Savona

The simulation of many-body open quantum systems is key to solving numerous outstanding problems in physics, chemistry, material science, and in the development of quantum technologies. Near-term quantum computers may bring considerable advantage for the e ...

2025

Phonon pumping by modulating the ultrastrong vacuum

Vincenzo Savona, Fabrizio Minganti, Marco Scigliuzzo

The vacuum (i.e., the ground state) of a system in ultrastrong light-matter coupling contains particles that cannot be emitted without any dynamical perturbation and is thus called virtual. We propose a protocol for inducing and observing real mechanical e ...

2024

Adaptive variational low-rank dynamics for open quantum systems

Vincenzo Savona, Luca Gravina

We introduce a model-independent method for the efficient simulation of low-entropy systems, whose dynamics can be accurately described with a limited number of states. Our method leverages the time-dependent variational principle to efficiently integrate ...

Amer Physical Soc2024

Critical Schrodinger Cat Qubit

Vincenzo Savona, Luca Gravina, Fabrizio Minganti

Encoding quantum information onto bosonic systems is a promising route to quantum error correc-tion. In a cat code, this encoding relies on the confinement of the dynamics of the system onto the two-dimensional manifold spanned by Schrodinger cats of oppos ...

AMER PHYSICAL SOC2023

Dissipative phase transitions in n-photon driven quantum nonlinear resonators

Vincenzo Savona, Fabrizio Minganti

We investigate and characterize the emergence of finite-component dissipative phase transitions (DPTs) in nonlinear photon resonators subject to n-photon driving and dissipation. Exploiting a semiclassical approach, we derive general results on the occurre ...

Verein Forderung Open Access Publizierens Quantenwissenschaf2023

Quantum error correction using squeezed Schrodinger cat states

Vincenzo Savona, David Schlegel, Fabrizio Minganti

Bosonic quantum codes redundantly encode quantum information in the states of a quantum harmonic oscillator, making it possible to detect and correct errors. Schrodinger cat codes-based on the superposition of two coherent states with opposite displacement ...

AMER PHYSICAL SOC2022

Quantum dynamics of dissipative Kerr solitons

Vincenzo Savona, Kilian Robert Seibold, Riccardo Rota, Fabrizio Minganti

Dissipative Kerr solitons arising from parametric gain in ring microresonators are usually described within a classical mean-field framework. Here, we develop a quantum-mechanical model of dissipative Kerr solitons in terms of the Lindblad master equation ...

AMER PHYSICAL SOC2022

Global optimization of an encapsulated Si/SiO2L3 cavity with a 43 million quality factor

Vincenzo Savona, Juan Pablo Vasco Cano

We optimize a silica-encapsulated silicon L3 photonic crystal cavity for ultra-high quality factor by means of a global optimization strategy, where the closest holes surrounding the cavity are varied to minimize out-of-plane losses. We find an optimal val ...

Nature Research2021

A quantum algorithm for the direct estimation of the steady state of open quantum systems

Vincenzo Savona, Nathan Ramusat

Simulating the dynamics and the non-equilibrium steady state of an open quantum system are hard computational tasks on conventional computers. For the simulation of the time evolution, several efficient quantum algorithms have recently been developed. Howe ...

2021

Slow-light enhanced frequency combs and dissipative Kerr solitons in silicon coupled-ring microresonators in the telecom band

Vincenzo Savona

We propose a system of coupled microring resonators for the generation frequency combs and dissipative Kerr solitons in silicon at telecommunication frequencies. By taking advantage of structural slow-light, the effective non-linearity of the material is e ...

2021

Dissipative time crystal in an asymmetric nonlinear photonic dimer

Vincenzo Savona, Kilian Robert Seibold, Riccardo Rota

We investigate the behavior of two coupled nonlinear photonic cavities, in the presence of inhomogeneous coherent driving and local dissipations. By solving numerically the quantum master equation, either by diagonalizing the Liouvillian superoperator or b ...

AMER PHYSICAL SOC2020

Monolithic Silicon-Based Nanobeam Cavities for Integrated Nonlinear and Quantum Photonics

Vincenzo Savona, Kilian Robert Seibold, Juan Pablo Vasco Cano

Photonic resonators that allow an electromagnetic field to be confined in an ultrasmall volume with a long decay time are crucial to a number of applications requiring enhanced nonlinear effects. For applications to integrated photonic devices on chip, com ...

American Physical Society (APS)2020

Slow-Light Frequency Combs and Dissipative Kerr Solitons in Coupled-Cavity Waveguides

Vincenzo Savona, Juan Pablo Vasco Cano

We study Kerr frequency combs and dissipative Kerr solitons in silicon photonic crystal coupled-cavity waveguides (CCWs) with globally optimized dispersion at telecom wavelengths. The corresponding threshold for comb generation is found to explicitly depen ...

American Physical Society (APS)2019

Simulating frustrated antiferromagnets with quadratically driven QED cavities

Vincenzo Savona, Riccardo Rota

We propose a class of quantum simulators for antiferromagnetic spin systems based on coupled photonic cavities in the presence of two-photon driving and dissipation. By modeling the coupling between the different cavities through a hopping term with negati ...

AMER PHYSICAL SOC2019

Quantum Critical Regime in a Quadratically Driven Nonlinear Photonic Lattice

Vincenzo Savona, Cristiano Ciuti, Riccardo Rota, Fabrizio Minganti

We study an array of coupled optical cavities in the presence of two-photon driving and dissipation. The system displays a critical behavior similar to that of a quantum Ising model at finite temperature. Using the corner-space renormalization method, we c ...

AMER PHYSICAL SOC2019

Variational Quantum Monte Carlo Method with a Neural-Network Ansatz for Open Quantum Systems

Vincenzo Savona, Alexandra Nagy

The possibility to simulate the properties of many-body open quantum systems with a large number of degrees of freedom (d.o.f.) is the premise to the solution of several outstanding problems in quantum science and quantum information. The challenge posed b ...

AMER PHYSICAL SOC2019