Irénée Frérot
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View article: Science et politique à l’ère de Donald Trump
Science et politique à l’ère de Donald Trump Open
Les attaques de Donald Trump contre la science américaine fragilisent la recherche dans de nombreux domaines, en particulier le climat, la santé publique et les sciences sociales. Plus qu’une remise en cause de la science en bloc, il s’agi…
View article: Excitonic oscillator-strength saturation dominates polariton-polariton interactions
Excitonic oscillator-strength saturation dominates polariton-polariton interactions Open
Exciton-polaritons in semiconductor microcavities exhibit large two-body interactions that, thanks to ever refined nanotechnology techniques, are getting closer and closer to the quantum regime where single-photon nonlinearities start bein…
View article: Symmetry: A Fundamental Resource for Quantum Coherence and Metrology
Symmetry: A Fundamental Resource for Quantum Coherence and Metrology Open
We introduce a new paradigm for the preparation of deeply entangled states useful for quantum metrology. We show that, when the quantum state is an eigenstate of an operator A, observables G which are completely off diagonal with respect t…
View article: Certifying Ground-State Properties of Many-Body Systems
Certifying Ground-State Properties of Many-Body Systems Open
A ubiquitous problem in quantum physics is to understand the ground-state properties of many-body systems. Confronted with the fact that exact diagonalization quickly becomes impossible when increasing the system size, variational approach…
View article: Bogoliubov Excitations Driven by Thermal Lattice Phonons in a Quantum Fluid of Light
Bogoliubov Excitations Driven by Thermal Lattice Phonons in a Quantum Fluid of Light Open
The elementary excitations in weakly interacting quantum fluids have a nontrivial nature which is at the basis of defining quantum phenomena such as superfluidity. These excitations and the physics they lead to have been explored in closed…
View article: Certifying the quantum Fisher information from a given set of mean values: a semidefinite programming approach
Certifying the quantum Fisher information from a given set of mean values: a semidefinite programming approach Open
We introduce a semidefinite programming algorithm to find the minimal quantum Fisher information compatible with an arbitrary dataset of mean values. This certification task allows one to quantify the resource content of a quantum system f…
View article: Certifying ground-state properties of quantum many-body systems
Certifying ground-state properties of quantum many-body systems Open
A ubiquitous problem in quantum physics is to understand the ground-state properties of many-body systems. Confronted with the fact that exact diagonalisation quickly becomes impossible when increasing the system size, variational approach…
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: Bogoliubov excitations driven by thermal lattice phonons in a quantum fluid of light
Bogoliubov excitations driven by thermal lattice phonons in a quantum fluid of light Open
The elementary excitations in weakly interacting quantum fluids have a non-trivial nature which is at the basis of defining quantum phenomena such as superfluidity. These excitations and the physics they lead to have been explored in close…
View article: Probing quantum entanglement from magnetic-sublevels populations: beyond spin squeezing inequalities
Probing quantum entanglement from magnetic-sublevels populations: beyond spin squeezing inequalities Open
Spin squeezing inequalities (SSI) represent a major tool to probe quantum entanglement among a collection of few-level atoms, and are based on collective spin measurements and their fluctuations. Yet, for atomic ensembles of spin- atoms an…
View article: Three numerical approaches to find mutually unbiased bases using Bell inequalities
Three numerical approaches to find mutually unbiased bases using Bell inequalities Open
Mutually unbiased bases correspond to highly useful pairs of measurements in quantum information theory. In the smallest composite dimension, six, it is known that between three and seven mutually unbiased bases exist, with a decades-old c…
View article: Thermal Critical Dynamics from Equilibrium Quantum Fluctuations
Thermal Critical Dynamics from Equilibrium Quantum Fluctuations Open
We show that quantum fluctuations display a singularity at thermal critical points, involving the dynamical z exponent. Quantum fluctuations, captured by the quantum variance [Frérot et al., Phys. Rev. B 94, 075121 (2016)PRBMDO2469-995010.…
View article: Probing quantum entanglement from magnetic-sublevels populations: beyond\n spin squeezing inequalities
Probing quantum entanglement from magnetic-sublevels populations: beyond\n spin squeezing inequalities Open
Spin squeezing inequalities (SSI) represent a major tool to probe quantum\nentanglement among a collection of few-level atoms, and are based on collective\nspin measurements and their fluctuations. Yet, for atomic ensembles of spin-$j$\nat…
View article: Three numerical approaches to find mutually unbiased bases using Bell inequalities
Three numerical approaches to find mutually unbiased bases using Bell inequalities Open
Mutually unbiased bases correspond to highly useful pairs of measurements in quantum information theory. In the smallest composite dimension, six, it is known that between three and seven mutually unbiased bases exist, with a decades-old c…
View article: Three numerical approaches to find mutually unbiased bases using Bell inequalities
Three numerical approaches to find mutually unbiased bases using Bell inequalities Open
Mutually unbiased bases correspond to highly useful pairs of measurements in quantum information theory. In the smallest composite dimension, six, it is known that between three and seven mutually unbiased bases exist, with a decades-old c…
View article: Unveiling Quantum Entanglement in Many-Body Systems from Partial Information
Unveiling Quantum Entanglement in Many-Body Systems from Partial Information Open
Quantum entanglement is commonly assumed to be a central resource for quantum\ncomputing and quantum simulation. Nonetheless, the capability to detect it in\nmany-body systems is severely limited by the absence of sufficiently scalable\nan…
View article: Coarse-Grained Self-Testing
Coarse-Grained Self-Testing Open
Self-testing is a device-independent method that usually amounts to show that the maximal quantum violation of a Bell's inequality certifies a unique quantum state, up to some symmetries inherent to the device-independent framework. In thi…
View article: Thermal critical dynamics from equilibrium quantum fluctuations
Thermal critical dynamics from equilibrium quantum fluctuations Open
We show that quantum fluctuations display a singularity at thermal critical points, involving the dynamical $z$ exponent. Quantum fluctuations, captured by the quantum variance (I. Frérot and T. Roscilde, Phys. Rev. B 94, 075121 (2016)), c…
View article: Entanglement entropy in low-energy field theories at a finite chemical potential
Entanglement entropy in low-energy field theories at a finite chemical potential Open
We investigate the leading area-law contribution to entanglement entropy in a system described by a general Lagrangian with O(2) symmetry containing first- and second-order time derivatives, namely, breaking the Lorentz invariance. We esta…
View article: Inferring Nonlinear Many-Body Bell Inequalities From Average Two-Body Correlations: Systematic Approach for Arbitrary Spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>j</mml:mi></mml:math> Ensembles
Inferring Nonlinear Many-Body Bell Inequalities From Average Two-Body Correlations: Systematic Approach for Arbitrary Spin- Ensembles Open
Violating Bell's inequalities (BIs) allows one to certify the preparation of\nentangled states from minimal assumptions -- in a device-independent manner.\nFinding BIs tailored to many-body correlations as prepared in present-day\nquantum …
View article: Optimal Entanglement Witnesses: A Scalable Data-Driven Approach
Optimal Entanglement Witnesses: A Scalable Data-Driven Approach Open
Multipartite entanglement is a key resource allowing quantum devices to outperform their classical counterparts, and entanglement certification is fundamental to assess any quantum advantage. The only scalable certification scheme relies o…
View article: Comment on “Strong Quantum Darwinism and Strong Independence Are Equivalent to Spectrum Broadcast Structure”
Comment on “Strong Quantum Darwinism and Strong Independence Are Equivalent to Spectrum Broadcast Structure” Open
In a recent Letter [Phys. Rev. Lett. 122, 010403 (2019)], an equivalence is proposed between the so-called Spectrum Broadcast Structure for a system-multienvironment quantum state, and the conjunction of two information-theory notions: (a)…
View article: Detecting Many-Body Bell Nonlocality by Solving Ising Models
Detecting Many-Body Bell Nonlocality by Solving Ising Models Open
Bell nonlocality represents the ultimate consequence of quantum entanglement, fundamentally undermining the classical tenet that spatially separated degrees of freedom possess objective attributes independently of the act of their measurem…
View article: Optimal entanglement witnesses: a scalable data-driven approach
Optimal entanglement witnesses: a scalable data-driven approach Open
Multipartite entanglement is the key resource allowing quantum devices to outperform their classical counterparts, and entanglement certification is fundamental to assess any quantum advantage. The only scalable certification scheme relies…
View article: Simulating Twistronics without a Twist
Simulating Twistronics without a Twist Open
Rotational misalignment or twisting of two monolayers of graphene strongly influences its electronic properties. Structurally, twisting leads to large periodic supercell structures, which in turn can support intriguing strongly correlated …
View article: Bell Correlations at Ising Quantum Critical Points
Bell Correlations at Ising Quantum Critical Points Open
When a collection of distant observers share an entangled quantum state, the statistical correlations among their measurements may violate a many-body Bell inequality, demonstrating a nonlocal behavior. Focusing on the Ising model in a tra…
View article: Report on 1902.03908v1
Report on 1902.03908v1 Open
We study the robustness of 3D intrinsic topogical order under external perturbations by investigating the paradigmatic microscopic model, the 3D toric code in an external magnetic field.Exact dualities as well as variational calculations r…
View article: Competing orders in colloidal kagome ice: Importance of the in-trap motion of the particles
Competing orders in colloidal kagome ice: Importance of the in-trap motion of the particles Open
Artificial ice systems have been designed to replicate paradigmatic phenomena observed in frustrated spin systems. Here, we present a detailed theoretical analysis based on Monte Carlo simulations of the low-energy phases in an artificial …
View article: Quantum Critical Metrology
Quantum Critical Metrology Open
Quantum metrology fundamentally relies upon the efficient management of quantum uncertainties. We show that under equilibrium conditions the management of quantum noise becomes extremely flexible around the quantum critical point of a quan…
View article: Multispeed Prethermalization in Quantum Spin Models with Power-Law Decaying Interactions
Multispeed Prethermalization in Quantum Spin Models with Power-Law Decaying Interactions Open
The relaxation of uniform quantum systems with finite-range interactions after a quench is generically driven by the ballistic propagation of long-lived quasiparticle excitations triggered by a sufficiently small quench. Here we investigat…