Giulio Gasbarri
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View article: Single-letter Chain Rule for Quantum Relative Entropy
Single-letter Chain Rule for Quantum Relative Entropy Open
Relative entropy is the standard measure of distinguishability in classical and quantum information theory. In the classical case, its loss under channels admits an exact chain rule, while in the quantum case only asymptotic, regularized c…
View article: Prepare-and-measure and entanglement simulation beyond qubits
Prepare-and-measure and entanglement simulation beyond qubits Open
For two non-communicating parties, quantum theory can give rise to probability distributions of outcomes that no local classical model can reproduce without communication. However, in the case of two-dimensional systems ($d=2$), it is know…
View article: Sequential analysis in a continuous spin-noise quantum sensor
Sequential analysis in a continuous spin-noise quantum sensor Open
Many control and detection applications require real-time analysis of signals from sensors, in order to quickly and accurately act upon events revealed by the sensors. Such signal analysis benefits from statistical models of signal and sen…
View article: Thermodynamically consistent collisional master equation in a low-density gas with internal structure
Thermodynamically consistent collisional master equation in a low-density gas with internal structure Open
Quantum thermodynamics with open systems is often based on the quantum optical weak-coupling master equation or on operational repeated interaction models, whereas early works on thermalisation and on decoherence theory were mostly concern…
View article: Unveiling coherent dynamics in non-Markovian open quantum systems: exact expression and recursive perturbation expansion
Unveiling coherent dynamics in non-Markovian open quantum systems: exact expression and recursive perturbation expansion Open
We introduce a systematic framework to derive the effective Hamiltonian governing the coherent dynamics of non-Markovian open quantum systems. By applying the minimal dissipation principle, we uniquely isolate the coherent contribution to …
View article: Recursive perturbation approach to time-convolutionless master equations: Explicit construction of generalized Lindblad generators for arbitrary open systems
Recursive perturbation approach to time-convolutionless master equations: Explicit construction of generalized Lindblad generators for arbitrary open systems Open
We develop a recursive perturbative expansion for the time-convolutionless (TCL) generator of an open quantum system in a generalized Lindblad form. This formulation provides a systematic approach to derive the generator at arbitrary order…
View article: Sequential hypothesis testing for continuously-monitored quantum systems
Sequential hypothesis testing for continuously-monitored quantum systems Open
We consider a quantum system that is being continuously monitored, giving rise to a measurement signal. From such a stream of data, information needs to be inferred about the underlying system's dynamics. Here we focus on hypothesis t…
View article: Nanoparticle Interferometer by Throw and Catch
Nanoparticle Interferometer by Throw and Catch Open
Matter wave interferometry with increasingly larger masses could pave the way to understanding the nature of wavefunction collapse, the quantum to classical transition, or even how an object in a spatial superposition interacts with its gr…
View article: Nanoparticle Interferometer by Throw and Catch
Nanoparticle Interferometer by Throw and Catch Open
Matter-wave interferometry with increasingly larger masses could pave the way to understanding the nature of wavefunction collapse, the quantum to classical transition or even how an object in a spatial superposition interacts with its gra…
View article: Sequential hypothesis testing for continuously-monitored quantum systems
Sequential hypothesis testing for continuously-monitored quantum systems Open
We consider a quantum system that is being continuously monitored, giving rise to a measurement signal. From such a stream of data, information needs to be inferred about the underlying system's dynamics. Here we focus on hypothesis testin…
View article: Linear-response approach to critical quantum many-body systems
Linear-response approach to critical quantum many-body systems Open
The characterization of quantum critical phenomena is pivotal for the understanding and harnessing of quantum many-body physics. However, their complexity makes the inference of such fundamental processes difficult. Thus, efficient and exp…
View article: Quantum physics in space
Quantum physics in space Open
Advances in quantum technologies are giving rise to a revolution in the way fundamental physics questions are explored at the empirical level. At the same time, they are the seeds for future disruptive technological applications of quantum…
View article: Quantum physics in space
Quantum physics in space Open
View article: Test quantum mechanics in space — invest US$1 billion
Test quantum mechanics in space — invest US$1 billion Open
View article: Gravitational decoherence: A nonrelativistic spin 1/2 fermionic model
Gravitational decoherence: A nonrelativistic spin 1/2 fermionic model Open
In a previous work [arXiv1905.01121] we have derived a quantum master\nequation for the dynamics of a scalar bosonic particle interacting with a weak,\nstochastic and classical gravitational field. As standard matter is made of\nfermions, …
View article: Testing the foundation of quantum physics in space via Interferometric and non-interferometric experiments with mesoscopic nanoparticles
Testing the foundation of quantum physics in space via Interferometric and non-interferometric experiments with mesoscopic nanoparticles Open
Quantum technologies are opening novel avenues for applied and fundamental science at an impressive pace. In this perspective article, we focus on the promises coming from the combination of quantum technologies and space science to test t…
View article: Testing the foundations of quantum physics in space Interferometric and non-interferometric tests with Large Particles
Testing the foundations of quantum physics in space Interferometric and non-interferometric tests with Large Particles Open
Quantum technologies are opening novel avenues for applied and fundamental science at an impressive pace. In this perspective article, we focus on the promises coming from the combination of quantum technologies and space science to test t…
View article: Gravitational decoherence: A general nonrelativistic model
Gravitational decoherence: A general nonrelativistic model Open
We derive a general quantum master equation for the dynamics of a scalar bosonic particle interacting with a weak, stochastic and classical external gravitational field. The dynamics predicts decoherence in position, momentum and energy. W…
View article: Gravitational Decoherence and the Possibility of Its Interferometric Detection
Gravitational Decoherence and the Possibility of Its Interferometric Detection Open
We present a general master equation describing the quantum dynamics of a scalar bosonic field interacting with an external weak and stochastic gravitational field. The dynamics predicts decoherence both in position and in energy momentum.…
View article: Mass-coupled relativistic spontaneous collapse models
Mass-coupled relativistic spontaneous collapse models Open
Currently there is not a satisfactory relativistic spontaneous collapse model. Here we show the impossibility of a simple generalization of the continuous spontaneous collapse (CSL) model to the relativistic framework. We consider a mass c…
View article: Prospects for near-field interferometric tests of collapse models
Prospects for near-field interferometric tests of collapse models Open
Near-field interferometry with large dielectric nanoparticles opens the way to test fundamental modifications of standard quantum mechanics at an unprecedented level. We showcase the capabilities of such platform, in a state-of-the-art gro…
View article: Zel’dovich Amplification in a Superconducting Circuit
Zel’dovich Amplification in a Superconducting Circuit Open
Zel'dovich proposed that electromagnetic (EM) waves with angular momentum reflected from a rotating metallic, lossy cylinder will be amplified. However, we are still lacking a direct experimental EM-wave verification of this fifty-year-old…
View article: Data for "Testing dissipative collapse models with a levitated micromagnet"
Data for "Testing dissipative collapse models with a levitated micromagnet" Open
Data for the journal article: Vinante, A, Gasbarri, G, Timberlake, C, Toros, M & Ulbricht, H 2020, 'Testing dissipative collapse models with a levitated micromagnet', Physical Review Research.
View article: Ultrahigh mechanical quality factor with Meissner-levitated ferromagnetic microparticles
Ultrahigh mechanical quality factor with Meissner-levitated ferromagnetic microparticles Open
View article: Acceleration sensing with magnetically levitated oscillators.
Acceleration sensing with magnetically levitated oscillators. Open
We experimentally demonstrate stable trapping of a permanent magnet sphere above a lead superconductor, in vacuum pressures of $4 \times 10^{-8}$~mbar. The levitating magnet behaves as a harmonic oscillator, with frequencies in the 4-31~Hz…
View article: Talbot-Lau effect beyond the point-particle approximation
Talbot-Lau effect beyond the point-particle approximation Open
Recent progress in matter-wave interferometry aims to directly probe the quantum properties of matter on ever increasing scales. However, in order to perform interferometric experiments with massive mesoscopic objects, taking into account …
View article: The inverse Born problem in contextual probability theories: quantum spin and continuous random variables
The inverse Born problem in contextual probability theories: quantum spin and continuous random variables Open
We revise contextual probability theory and the associated inverse Born problem, solved by the Quantum-Like Representation Algorithm (QLRA) in case of two discrete random variables. After pointing out the special feature and limitations of…
View article: Stochastic unravelings of non-Markovian completely positive and trace-preserving maps
Stochastic unravelings of non-Markovian completely positive and trace-preserving maps Open
We consider open quantum systems with factorized initial states, providing the structure of the reduced system dynamics, in terms of environment cumulants. We show that such completely positive (CP) and trace-preserving (TP) maps can be un…
View article: Recursive approach for non-Markovian time-convolutionless master equations
Recursive approach for non-Markovian time-convolutionless master equations Open
We consider a general open system dynamics and we provide a recursive method to derive the associated non-Markovian master equation in a perturbative series. The approach relies on a momenta expansion of the open system evolution. Unlike p…
View article: Gravity induced wave function collapse
Gravity induced wave function collapse Open
Starting from an idea of S. L. Adler [in Quantum Nonlocality and Reality: 50 Years of Bell’s Theorem, edited by M. Bell and S. Gao (Cambridge University Press, Cambridge, England 2016)], we develop a novel model of gravity induced spontane…