Benoît Vermersch
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View article: Analytically Continuing the Randomized Measurement Toolbox
Analytically Continuing the Randomized Measurement Toolbox Open
We develop a framework for extracting non-polynomial analytic functions of density matrices in randomized measurement experiments by a method of analytical continuation. A central advantage of this approach, dubbed stabilized analytic cont…
View article: RandomMeas.jl: A Julia Package for Randomized Measurements in Quantum Devices
RandomMeas.jl: A Julia Package for Randomized Measurements in Quantum Devices Open
We introduce RandomMeas.jl, a modular and high-performance open-source software package written in Julia for implementing and analyzing randomized measurement protocols in quantum computing. Randomized measurements provide a powerful frame…
View article: Learning mixed quantum states in large-scale experiments
Learning mixed quantum states in large-scale experiments Open
We present and test a protocol to learn the matrix-product operator (MPO) representation of an experimentally prepared quantum state. The protocol takes as an input classical shadows corresponding to local randomized measurements, and outp…
View article: Thermalization and criticality on an analogue–digital quantum simulator
Thermalization and criticality on an analogue–digital quantum simulator Open
Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators 1,2 . Unlocking the full potential of such systems towards this goal requires flexible initial state preparation, precise time …
View article: Universal quantum processors in spin systems via robust local pulse sequences
Universal quantum processors in spin systems via robust local pulse sequences Open
We propose a protocol to realize quantum simulation and computation in spin systems with long-range interactions. Our approach relies on the local addressing of single spins with external fields parametrized by Walsh functions. This enable…
View article: Many-Body Entropies and Entanglement from Polynomially Many Local Measurements
Many-Body Entropies and Entanglement from Polynomially Many Local Measurements Open
Estimating global properties of many-body quantum systems such as entropy or bipartite entanglement is a notoriously difficult task, typically requiring a number of measurements or classical postprocessing resources growing exponentially i…
View article: Robust Estimation of the Quantum Fisher Information on a Quantum Processor
Robust Estimation of the Quantum Fisher Information on a Quantum Processor Open
We present the experimental measurement, on a quantum processor, of a series of polynomial lower bounds that to the quantum Fisher information (QFI), a fundamental quantity for certifying multipartite entanglement that is useful for metrol…
View article: Thermalization and Criticality on an Analog-Digital Quantum Simulator
Thermalization and Criticality on an Analog-Digital Quantum Simulator Open
Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators. Unlocking the full potential of such systems toward this goal requires flexible initial state preparation, precise time evolut…
View article: Enhanced Estimation of Quantum Properties with Common Randomized Measurements
Enhanced Estimation of Quantum Properties with Common Randomized Measurements Open
We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about the quantum state. This consists in performing randomized measurements on a quantum processor and comparing …
View article: Observing the quantum Mpemba effect in quantum simulations
Observing the quantum Mpemba effect in quantum simulations Open
The non-equilibrium physics of many-body quantum systems harbors various unconventional phenomena. In this study, we experimentally investigate one of the most puzzling of these phenomena -- the quantum Mpemba effect, where a tilted ferrom…
View article: Universal quantum processors in spin systems via robust local pulse sequences
Universal quantum processors in spin systems via robust local pulse sequences Open
We propose a protocol to realize quantum simulation and computation in spin systems with long-range interactions. Our approach relies on the local addressing of single spins with external fields parametrized by Walsh functions. This enable…
View article: Many-body entropies and entanglement from polynomially-many local measurements
Many-body entropies and entanglement from polynomially-many local measurements Open
Estimating global properties of many-body quantum systems such as entropy or bipartite entanglement is a notoriously difficult task, typically requiring a number of measurements or classical post-processing resources growing exponentially …
View article: A randomized measurement toolbox for an interacting Rydberg-atom quantum simulator
A randomized measurement toolbox for an interacting Rydberg-atom quantum simulator Open
We present a toolbox to probe quantum many-body states implemented on Rydberg-atoms quantum hardware via randomized measurements. We illustrate the efficacy of this measurement toolbox in the context of probing entanglement, via the estima…
View article: Fermionic quantum processing with programmable neutral atom arrays
Fermionic quantum processing with programmable neutral atom arrays Open
Simulating the properties of many-body fermionic systems is an outstanding computational challenge relevant to material science, quantum chemistry, and particle physics.-5.4pc]Please note that the spelling of the following author names in …
View article: Robust estimation of the Quantum Fisher Information on a quantum processor
Robust estimation of the Quantum Fisher Information on a quantum processor Open
We present the experimental measurement, on a quantum processor, of a series of polynomial lower bounds that converge to the quantum Fisher information (QFI), a fundamental quantity for certifying multipartite entanglement that is useful f…
View article: Fermionic quantum processing with programmable neutral atom arrays
Fermionic quantum processing with programmable neutral atom arrays Open
Simulating the properties of many-body fermionic systems is an outstanding computational challenge relevant to material science, quantum chemistry, and particle physics. Although qubit-based quantum computers can potentially tackle this pr…
View article: Entanglement Barrier and its Symmetry Resolution: Theory and Experimental Observation
Entanglement Barrier and its Symmetry Resolution: Theory and Experimental Observation Open
International audience
View article: Entanglement phase diagrams from partial transpose moments
Entanglement phase diagrams from partial transpose moments Open
We present experimentally and numerically accessible quantities that can be used to differentiate among various families of random entangled states. To this end, we analyze the entanglement properties of bipartite reduced states of a tripa…
View article: Entanglement barrier and its symmetry resolution: theory and experiment
Entanglement barrier and its symmetry resolution: theory and experiment Open
The operator entanglement (OE) is a key quantifier of the complexity of a reduced density matrix. In out-of-equilibrium situations, e.g. after a quantum quench of a product state, it is expected to exhibit an entanglement barrier. The OE o…
View article: Entanglement Hamiltonians: From Field Theory to Lattice Models and Experiments
Entanglement Hamiltonians: From Field Theory to Lattice Models and Experiments Open
Results about entanglement (or modular) Hamiltonians of quantum many‐body systems in field theory and statistical mechanics models, and recent applications in the context of quantum information and quantum simulation, are reviewed. In the …
View article: Fermionic correlation functions from randomized measurements in programmable atomic quantum devices
Fermionic correlation functions from randomized measurements in programmable atomic quantum devices Open
We provide a measurement protocol to estimate 2- and 4-point fermionic correlations in ultra-cold atom experiments. Our approach is based on combining random atomic beam splitter operations, which can be realized with programmable optical …
View article: Symmetry-resolved dynamical purification in synthetic quantum matter
Symmetry-resolved dynamical purification in synthetic quantum matter Open
When a quantum system initialized in a product state is subjected to either coherent or incoherent dynamics, the entropy of any of its connected partitions generically increases as a function of time, signalling the inevitable spreading of…
View article: The randomized measurement toolbox
The randomized measurement toolbox Open
Increasingly sophisticated programmable quantum simulators and quantum computers are opening unprecedented opportunities for exploring and exploiting the properties of highly entangled complex quantum systems. The complexity of large quant…
View article: Report on 2101.07814v3
Report on 2101.07814v3 Open
When a quantum system initialized in a product state is subjected to either coherent or incoherent dynamics, the entropy of any of its connected partitions generically increases as a function of time, signalling the inevitable spreading of…
View article: Report on 2101.07814v2
Report on 2101.07814v2 Open
When a quantum system initialized in a product state is subjected to either coherent or incoherent dynamics, the entropy of any of its connected partitions generically increases as a function of time, signalling the inevitable spreading of…
View article: Probing Many-Body Quantum Chaos with Quantum Simulators
Probing Many-Body Quantum Chaos with Quantum Simulators Open
The spectral form factor (SFF), characterizing statistics of energy eigenvalues, is a key diagnostic of many-body quantum chaos. In addition, partial spectral form factors (PSFFs) can be defined which refer to subsystems of the many-body s…
View article: Report on 2101.07814v2
Report on 2101.07814v2 Open
When a quantum system initialized in a product state is subjected to either coherent or incoherent dynamics, the entropy of any of its connected partitions generically increases as a function of time, signalling the inevitable spreading of…
View article: Report on 2101.07814v2
Report on 2101.07814v2 Open
When a quantum system initialized in a product state is subjected to either coherent or incoherent dynamics, the entropy of any of its connected partitions generically increases as a function of time, signalling the inevitable spreading of…
View article: Quantum Fisher Information from Randomized Measurements
Quantum Fisher Information from Randomized Measurements Open
The quantum Fisher information (QFI) is a fundamental quantity of interest in many areas from quantum metrology to quantum information theory. It can in particular be used as a witness to establish the degree of multi-particle entanglement…
View article: A randomized measurement toolbox for an interacting Rydberg-atom quantum simulator
A randomized measurement toolbox for an interacting Rydberg-atom quantum simulator Open
We present a toolbox to probe quantum many-body states implemented on Rydberg-atoms quantum hardware via randomized measurements. We illustrate the efficacy of this measurement toolbox in the context of probing entanglement, via the estima…