Alessandro Romito
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View article: Symmetries, conservation laws and entanglement in non-Hermitian fermionic lattices
Symmetries, conservation laws and entanglement in non-Hermitian fermionic lattices Open
Non-Hermitian quantum many-body systems feature steady-state entanglement transitions driven by the competition between unitary dynamics and dissipation. In this work, we reveal the fundamental role of conservation laws in shaping this com…
View article: Measurement-induced phase transition in interacting bosons from most likely quantum trajectory
Measurement-induced phase transition in interacting bosons from most likely quantum trajectory Open
We propose a new theoretical method to describe the monitored dynamics of bosonic many-body systems based on the concept of the most likely trajectory. We show how such trajectory can be identified from the probability distribution of quan…
View article: Data for ''Theory of the correlated quantum Zeno effect in a monitored qubit dimer''
Data for ''Theory of the correlated quantum Zeno effect in a monitored qubit dimer'' Open
Data and script for the figures in the paper "Theory of the correlated quantum Zeno effect in a monitored qubit dimer."
View article: Theory of Free Fermions Dynamics under Partial Postselected Monitoring
Theory of Free Fermions Dynamics under Partial Postselected Monitoring Open
Monitored quantum systems undergo measurement-induced phase transitions (MiPTs) stemming from the interplay between measurements and unitary dynamics. When the detector readout is postselected to match a given value, the dynamics is genera…
View article: Controlling measurement-induced phase transitions with tunable detector coupling
Controlling measurement-induced phase transitions with tunable detector coupling Open
We study the evolution of a quantum many-body system driven by two competing measurements, which induces a topological entanglement transition between two distinct area law phases. We employ a positive operator-valued measurement with vari…
View article: Hierarchical analytical approach to universal spectral correlations in Brownian quantum chaos
Hierarchical analytical approach to universal spectral correlations in Brownian quantum chaos Open
We develop an analytical approach to the spectral form factor and out-of-time ordered correlators in zero-dimensional Brownian models of quantum chaos. The approach expresses these spectral correlations as part of a closed hierarchy of dif…
View article: Spectral chaos bounds from scaling theory of maximally efficient quantum-dynamical scrambling
Spectral chaos bounds from scaling theory of maximally efficient quantum-dynamical scrambling Open
A key conjecture about the evolution of complex quantum systems towards an ergodic steady state, known as scrambling, is that this process acquires universal features when it is most efficient. We develop a single-parameter scaling theory …
View article: Entanglement and operator correlation signatures of many-body quantum Zeno phases in inefficiently monitored noisy systems
Entanglement and operator correlation signatures of many-body quantum Zeno phases in inefficiently monitored noisy systems Open
The interplay between information-scrambling Hamiltonians and local continuous measurements hosts platforms for exotic measurement-induced phase transition in out-of-equilibrium steady states. Here, we consider such transitions under the a…
View article: Stochastic action for the entanglement of a noisy monitored two-qubit system
Stochastic action for the entanglement of a noisy monitored two-qubit system Open
We study the effect of local unitary noise on the entanglement evolution of a two-qubit system subject to local monitoring and interqubit coupling by constructing a suitable stochastic path integral based on the Chantasri-Dressel-Jordan fo…
View article: Hierarchical analytical approach to universal spectral correlations in Brownian Quantum Chaos
Hierarchical analytical approach to universal spectral correlations in Brownian Quantum Chaos Open
We develop an analytical approach to the spectral form factor and out-of-time ordered correlators in zero-dimensional Brownian models of quantum chaos. The approach expresses these spectral correlations as part of a closed hierarchy of dif…
View article: Effect of the readout efficiency of quantum measurement on the system entanglement
Effect of the readout efficiency of quantum measurement on the system entanglement Open
Monitored quantum systems evolve along stochastic trajectories correlated\nwith the observer's knowledge of the system's state. Under such dynamics,\ncertain quantum resources like entanglement may depend on the observer's state\nof knowle…
View article: Entanglement and operator correlation signatures of many-body quantum Zeno phases in inefficiently monitored noisy systems
Entanglement and operator correlation signatures of many-body quantum Zeno phases in inefficiently monitored noisy systems Open
The interplay between information-scrambling Hamiltonians and local continuous measurements hosts platforms for exotic measurement-induced phase transition in out-of-equilibrium steady states. Here, we consider such transitions under the a…
View article: Action formalism for geometric phases from self-closing quantum trajectories
Action formalism for geometric phases from self-closing quantum trajectories Open
When subject to measurements, quantum systems evolve along stochastic quantum trajectories that can be naturally equipped with a geometric phase observable via a post-selection in a final projective measurement. When post-selecting the tra…
View article: Controlling measurement-induced phase transitions with tunable detector coupling
Controlling measurement-induced phase transitions with tunable detector coupling Open
We study the evolution of a quantum many-body system driven by two competing measurements, which induces a topological entanglement transition between two distinct area law phases. We employ a positive operator-valued measurement with vari…
View article: Stochastic action for the entanglement of a noisy monitored two-qubit system
Stochastic action for the entanglement of a noisy monitored two-qubit system Open
We study the effect of local unitary noise on the entanglement evolution of a two-qubit system subject to local monitoring and inter-qubit coupling. We construct a stochastic Hamiltonian by incorporating the noise into the Chantasri-Dresse…
View article: Action formalism for geometric phases from self-closing quantum trajectories
Action formalism for geometric phases from self-closing quantum trajectories Open
When subject to measurements, quantum systems evolve along stochastic quantum trajectories that can be naturally equipped with a geometric phase observable via a post-selection in a final projective measurement. When post-selecting the tra…
View article: Theory of free fermions dynamics under partial post-selected monitoring
Theory of free fermions dynamics under partial post-selected monitoring Open
Monitored quantum systems undergo Measurement-induced Phase Transitions (MiPTs) stemming from the interplay between measurements and unitary dynamics. When the detector readout is post-selected to match a given value, the dynamics is gener…
View article: Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure
Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure Open
The evolution of a quantum system subject to measurements can be described by stochastic quantum trajectories of pure states. Instead, the ensemble average over trajectories is a mixed state evolving via a master equation. Both description…
View article: Topological transitions of the generalized Pancharatnam-Berry phase
Topological transitions of the generalized Pancharatnam-Berry phase Open
Distinct from the dynamical phase, in a cyclic evolution, a system’s state may acquire an additional component, a.k.a. geometric phase. Recently, it has been demonstrated that geometric phases can be induced by a sequence of generalized me…
View article: Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure
Quantifying measurement-induced quantum-to-classical crossover using an open-system entanglement measure Open
The evolution of a quantum system subject to measurements can be described by stochastic quantum trajectories of pure states. Instead, the ensemble average over trajectories is a mixed state evolving via a master equation. Both description…
View article: Spectral chaos bounds from scaling theory of maximally efficient quantum-dynamical scrambling
Spectral chaos bounds from scaling theory of maximally efficient quantum-dynamical scrambling Open
A key conjecture about the evolution of complex quantum systems towards an ergodic steady state, known as scrambling, is that this process acquires universal features when it is most efficient. We develop a single-parameter scaling theory …
View article: Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array
Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array Open
We present and analyze a protocol for driven-dissipatively preparing and\nstabilizing a manifold of quantum manybody entangled states with\nsymmetry-protected topological order.\n Specifically, we consider the experimental platform consist…
View article: Quantum Effects on the Synchronization Dynamics of the Kuramoto Model
Quantum Effects on the Synchronization Dynamics of the Kuramoto Model Open
The Kuramoto model serves as a paradigm for describing spontaneous synchronization in a system of classical interacting rotors. In this study, we extend this model to the quantum domain by coupling quantum interacting rotors to external ba…
View article: Topological transitions in weakly monitored free fermions
Topological transitions in weakly monitored free fermions Open
We study a free fermion model where two sets of non-commuting non-projective measurements stabilize area-law entanglement scaling phases of distinct topological order. We show the presence of a topological phase transition that is of a dif…
View article: Topological transitions of the generalized Pancharatnam-Berry phase
Topological transitions of the generalized Pancharatnam-Berry phase Open
Distinct from the dynamical phase, in a cyclic evolution, a system's state may acquire an additional component, a.k.a. geometric phase. The latter is a manifestation of a closed path in state space. Geometric phases underlie various physic…
View article: Report on 2112.09787v3
Report on 2112.09787v3 Open
We study a free fermion model where two sets of non-commuting non-projective measurements stabilize area-law entanglement scaling phases of distinct topological order.We show the presence of a topological phase transition that is of a diff…
View article: Report on 2112.09787v2
Report on 2112.09787v2 Open
We study a free fermion model where two sets of non-commuting continuous measurements induce a transition between area-law entanglement scaling phases of distinct topological order.We find that, in the presence of unitary dynamics, the two…
View article: Observing a topological transition in weak-measurement-induced geometric phases
Observing a topological transition in weak-measurement-induced geometric phases Open
Measurement plays a quintessential role in the control of quantum systems.\nBeyond initialization and readout which pertain to projective measurements,\nweak measurements in particular, through their back-action on the system, may\nenable …
View article: Three-fold way of entanglement dynamics in monitored quantum circuits
Three-fold way of entanglement dynamics in monitored quantum circuits Open
We investigate the measurement-induced entanglement transition in quantum circuits built upon Dyson’s three circular ensembles (circular unitary, orthogonal, and symplectic ensembles; CUE, COE and CSE). We utilise the established model of …
View article: Report on 2112.09787v2
Report on 2112.09787v2 Open
We study a free fermion model where two sets of non-commuting continuous measurements induce a transition between area-law entanglement scaling phases of distinct topological order.We find that, in the presence of unitary dynamics, the two…