Matteo Fadel
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View article: Quantum metrology with a continuous-variable system
Quantum metrology with a continuous-variable system Open
As one of the main pillars of quantum technologies, quantum metrology aims to improve measurement precision using techniques from quantum information. The two main strategies to achieve this are the preparation of nonclassical states and t…
View article: Quantum teleportation of cat states with binary-outcome measurements
Quantum teleportation of cat states with binary-outcome measurements Open
We propose a teleportation protocol involving beam splitting operations and binary-outcome measurements, such as parity measurements. These operations have a straightforward implementation using the dispersive regime of the Jaynes–Cummings…
View article: Distributed quantum sensing with measurement-after-interaction strategies
Distributed quantum sensing with measurement-after-interaction strategies Open
We investigate multiparameter quantum estimation protocols based on measurement-after-interaction (MAI) strategies, in which the probe state undergoes an additional evolution prior to linear measurements. As we show in our study, this extr…
View article: Macroscopic quantum coherence and entanglement in mechanical systems
Macroscopic quantum coherence and entanglement in mechanical systems Open
The notion of a macroscopic quantum state must be pinned down in order to assess how well experiments probe the large-scale limits of quantum mechanics. However, the issue of quantifying so-called quantum macroscopicity is fraught with mul…
View article: On 2-variable $q$-Legendre polynomials: the view point of the $q$-operational technique
On 2-variable $q$-Legendre polynomials: the view point of the $q$-operational technique Open
In this work, we exploit the methods of an operational formality and extension of quasi-monomials to describe and realize 2-variable $q$-Legendre polynomials. We introduce the generating function of 2-variable $q$-Legendre polynomials with…
View article: Quantifying entanglement dimensionality from the quantum Fisher information matrix
Quantifying entanglement dimensionality from the quantum Fisher information matrix Open
Entanglement is known to be an essential resource for a number of tasks, including quantum-enhanced metrology, and can thus be quantified by figures of merit related to those tasks. In quantum metrology this is emphasized by the connection…
View article: Genuine quantum non-Gaussianity and metrological sensitivity of Fock states prepared in a mechanical resonator
Genuine quantum non-Gaussianity and metrological sensitivity of Fock states prepared in a mechanical resonator Open
Fock states of the quantum harmonic oscillator are fundamental to quantum sensing and information processing, serving as key resources for exploiting bosonic degrees of freedom. Here, we prepare high Fock states in a high-overtone bulk aco…
View article: Quantum gravitational decoherence of a mechanical oscillator from spacetime fluctuations
Quantum gravitational decoherence of a mechanical oscillator from spacetime fluctuations Open
We consider the scenario of a fluctuating spacetime due to a deformed commutation relation with a fluctuating deformation parameter, or to a fluctuating metric tensor. By computing the resulting dynamics and averaging over these fluctuatio…
View article: Theory-independent monitoring of the decoherence of a superconducting qubit with generalized contextuality
Theory-independent monitoring of the decoherence of a superconducting qubit with generalized contextuality Open
Characterizing the nonclassicality of quantum systems under minimal assumptions is an important challenge for quantum foundations and technology. Here we introduce a theory-independent method of process tomography and perform it on a super…
View article: Quantum metrology with a continuous-variable system
Quantum metrology with a continuous-variable system Open
As one of the main pillars of quantum technologies, quantum metrology aims to improve measurement precision using techniques from quantum information. The two main strategies to achieve this are the preparation of nonclassical states and t…
View article: Quantum entanglement in phase space
Quantum entanglement in phase space Open
While commonly used entanglement criteria for continuous variable systems are based on quadrature measurements, here we study entanglement detection from measurements of the Wigner function. These are routinely performed in platforms such …
View article: Deriving Three-Outcome Permutationally Invariant Bell Inequalities
Deriving Three-Outcome Permutationally Invariant Bell Inequalities Open
We present strategies to derive Bell inequalities valid for systems composed of many three-level parties. This scenario is formalized by a Bell experiment with N observers, each of which performs one out of two possible three-outcome measu…
View article: Characterizing the Multipartite Entanglement Structure of Non-Gaussian Continuous-Variable States with a Single Evolution Operator
Characterizing the Multipartite Entanglement Structure of Non-Gaussian Continuous-Variable States with a Single Evolution Operator Open
Multipartite entanglement is an essential resource for quantum information tasks, but characterizing entanglement structures in continuous variable systems remains challenging, especially in multimode non-Gaussian scenarios. In this work, …
View article: Quantum squeezing in a nonlinear mechanical oscillator
Quantum squeezing in a nonlinear mechanical oscillator Open
Mechanical degrees of freedom are natural candidates for continuous-variable quantum information processing and bosonic quantum simulations. However, these applications require the engineering of squeezing and nonlinearities in the quantum…
View article: Three-outcome multipartite Bell inequalities: applications to dimension witnessing and spin-nematic squeezing in many-body systems
Three-outcome multipartite Bell inequalities: applications to dimension witnessing and spin-nematic squeezing in many-body systems Open
We present a three-outcome permutationally-invariant Bell inequality, which we show to be naturally suited to explore nonlocal correlations in many-body spin-1 systems or SU(3) models. In the specific, we show how to derive from this inequ…
View article: Deriving three-outcome permutationally invariant Bell inequalities
Deriving three-outcome permutationally invariant Bell inequalities Open
We present strategies to derive Bell inequalities valid for systems composed of many three-level parties. This scenario is formalized by a Bell experiment with $N$ observers, each of which performs one out of two possible three-outcome mea…
View article: Integrability and Quantum Chaos in the Spectrum of Bell Operators
Integrability and Quantum Chaos in the Spectrum of Bell Operators Open
We introduce a permutationally invariant multipartite Bell inequality for many-body three-level systems and use it to investigate a connection between Bell nonlocality and (lack of) quantum chaos. Interpreting the Bell operator, defined by…
View article: Quantum metrology with a squeezed Kerr oscillator
Quantum metrology with a squeezed Kerr oscillator Open
We study the squeezing dynamics in a Kerr-nonlinear oscillator, and quantify the metrological usefulness of the resulting states. Even if the nonlinearity limits the attainable squeezing by making the evolution non-Gaussian, the states obt…
View article: A mechanical qubit
A mechanical qubit Open
Strong nonlinear interactions between quantized excitations are an important resource for quantum technologies based on bosonic oscillator modes. However, most electromagnetic and mechanical nonlinearities arising from intrinsic material p…
View article: Quantum squeezing in a nonlinear mechanical oscillator
Quantum squeezing in a nonlinear mechanical oscillator Open
Mechanical degrees of freedom are natural candidates for continuous-variable quantum information processing and bosonic quantum simulations. These applications, however, require the engineering of squeezing and nonlinearities in the quantu…
View article: Assisted metrology and preparation of macroscopic superpositions with split spin-squeezed states
Assisted metrology and preparation of macroscopic superpositions with split spin-squeezed states Open
We analyse the conditional states in which one part of a split spin-squeezed state is left, upon performing a collective spin measurement on the other part. For appropriate measurement directions and outcomes, we see the possibility of obt…
View article: Probing quantum correlations in many-body systems: a review of scalable methods
Probing quantum correlations in many-body systems: a review of scalable methods Open
We review methods that allow one to detect and characterize quantum correlations in many-body systems, with a special focus on approaches which are scalable. Namely, those applicable to systems with many degrees of freedom, without requiri…
View article: Multiparameter quantum metrology and mode entanglement with spatially split nonclassical spin ensembles
Multiparameter quantum metrology and mode entanglement with spatially split nonclassical spin ensembles Open
We identify the multiparameter sensitivity of entangled spin states, such as spin-squeezed and Dicke states that are spatially distributed into several addressable spatial modes. Analytical expressions for the spin-squeezing matrix of fami…
View article: Probing gravity-related decoherence with a 16 $μ$g Schrödinger cat state
Probing gravity-related decoherence with a 16 $μ$g Schrödinger cat state Open
The Schrödinger equation predicts the validity of the superposition principle at any scale, yet we do not experience cats being in a superposition of "dead" and "alive" in our everyday lives. Modifications to quantum theory at the fundamen…
View article: Detecting Bell correlations in multipartite non-Gaussian spin states
Detecting Bell correlations in multipartite non-Gaussian spin states Open
We expand the toolbox for studying Bell correlations in multipartite systems by introducing permutationally invariant Bell inequalities (PIBIs) involving few-body correlators. First, we present around twenty families of PIBIs with up to th…
View article: Engineering phonon-phonon interactions in multimode circuit quantum acousto-dynamics
Engineering phonon-phonon interactions in multimode circuit quantum acousto-dynamics Open
In recent years, remarkable progress has been made towards encoding and processing quantum information in the large Hilbert space of bosonic modes. Mechanical resonators are of great interest for this purpose, since they confine many high …
View article: Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering"
Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering" Open
1) Data points + code required to recreate the first 12 figures in the manuscript "Homodyne Detection of Non-Gaussian Quantum Steering". 2) Simulated homodyne detector data used in the final section of the paper.
View article: Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering"
Figure Data "Homodyne Detection of Non-Gaussian Quantum Steering" Open
1) Data points + code required to recreate the first 12 figures in the manuscript "Homodyne Detection of Non-Gaussian Quantum Steering". 2) Simulated homodyne detector data used in the final section of the paper.
View article: Schrödinger cat states of a 16-microgram mechanical oscillator
Schrödinger cat states of a 16-microgram mechanical oscillator Open
The superposition principle is one of the most fundamental principles of quantum mechanics. According to the Schrödinger equation, a physical system can be in any linear combination of its possible states. While the validity of this princi…
View article: Macroscopic quantum test with bulk acoustic wave resonators
Macroscopic quantum test with bulk acoustic wave resonators Open
Recently, solid-state mechanical resonators have become a platform for demonstrating non-classical behavior of systems involving a truly macroscopic number of particles. Here, we perform the most macroscopic quantum test in a mechanical re…