A5057993742- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum many-body systems
- Advanced Thermodynamics and Statistical Mechanics
- Neural Networks and Reservoir Computing
- Quantum and electron transport phenomena
- Advanced biosensing and bioanalysis techniques
- Physics of Superconductivity and Magnetism
- Gaussian Processes and Bayesian Inference
- Advancements in Semiconductor Devices and Circuit Design
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Ion-surface interactions and analysis
- Nanopore and Nanochannel Transport Studies
- Stochastic Gradient Optimization Techniques
Centre National de la Recherche Scientifique
2021-2024
Université Grenoble Alpes
2021-2024
Laboratoire de Physique et Modélisation des Milieux Condensés
2021-2024
Laboratoire Interdisciplinaire Carnot de Bourgogne
2020
Université Bourgogne Franche-Comté
2020
Maison des Sciences de l’Homme de Dijon
2020
An efficient method to extract higher-order density-matrix functionals and access operator entanglement is introduced tested on experimental data, improving the characterization of nonequilibrium dynamics many-body quantum systems.
The nonequilibrium physics of many-body quantum systems harbors various unconventional phenomena. In this Letter, we experimentally investigate one the most puzzling these phenomena—the Mpemba effect, where a tilted ferromagnet restores its symmetry more rapidly when it is farther from symmetric state compared to closer. We present first experimental evidence occurrence effect in trapped-ion simulator. breaking and restoration are monitored through entanglement asymmetry, probed via...
The quantum Fisher information (QFI) is a fundamental quantity of interest in many areas from metrology to theory. It can particular be used as witness establish the degree multiparticle entanglement many-body systems. In this work, we use polynomials density matrix construct monotonically increasing lower bounds that converge QFI. Using randomized measurements propose protocol accurately estimate these state-of-the-art technological platforms. We number needed achieve given accuracy and...
We present the experimental measurement, on a quantum processor, of series polynomial lower bounds that to Fisher information (QFI), fundamental quantity for certifying multipartite entanglement is useful metrological applications. combine advanced methods randomized measurement toolbox obtain estimators are robust regarding drifting errors caused uniquely during protocol. estimate QFI Greenberger-Horne-Zeilinger states, observing genuine entanglement. Then we prepare ground state...
We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about interest. This method involves performing randomized measurements on processor and comparing results with those obtained from classical computer that stores an approximation state. provide unbiased estimators expectation values multi-copy observables performance guarantees in terms variance bounds which depend accuracy. demonstrate effectiveness our approach...
We present the experimental measurement, on a quantum processor, of series polynomial lower bounds that converge to Fisher information (QFI), fundamental quantity for certifying multipartite entanglement is useful metrological applications. combine advanced methods randomized measurement toolbox obtain estimators are robust against drifting errors caused uniquely during protocol. estimate QFI Greenberg-Horne-Zeilinger states, observing genuine entanglement. Then, we prepare ground state...
MoS<sub>2</sub> nanopores have emerged as one of the most promising solid-state for protein sequence motifs detection.
Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators. Unlocking the full potential such systems toward this goal requires flexible initial state preparation, precise time evolution, and extensive probes for final characterization. We present simulator comprising 69 superconducting qubits which supports both universal gates high-fidelity analog with performance beyond reach classical simulation in cross-entropy benchmarking...
The operator entanglement (OE) is a key quantifier of the complexity reduced density matrix. In out-of-equilibrium situations, e.g. after quantum quench product state, it expected to exhibit an barrier. OE matrix initially grows linearly as builds up between local degrees freedom, then reaches maximum, and ultimately decays small finite value converges simple stationary state through standard thermalization mechanisms. Here, by performing new data analysis published experimental results...
We show that combining randomized measurement protocols with importance sampling allows for characterizing entanglement in significantly larger quantum systems and a more efficient way than previous work. A drastic reduction of statistical errors is obtained using classical techniques machine learning tensor networks partial information on the state. In current experimental settings engineered many-body this increases (sub-)system sizes which can be measured. particular, we an exponential...
We present a technique for enhancing the estimation of quantum state properties by incorporating approximate prior knowledge about state. This consists in performing randomized measurements on processor and comparing results with those obtained from classical computer that stores an approximation provide unbiased estimators expectation values multicopy observables performance guarantees terms variance bounds depend accuracy. demonstrate effectiveness our approach through experimental...
The non-equilibrium physics of many-body quantum systems harbors various unconventional phenomena. In this study, we experimentally investigate one the most puzzling these phenomena -- Mpemba effect, where a tilted ferromagnet restores its symmetry more rapidly when it is farther from symmetric state compared to closer. We present first experimental evidence occurrence effect in trapped-ion simulator. breaking and restoration are monitored through entanglement asymmetry, probed via...
Quantum computing has tremendous potential to overcome some of the fundamental limitations present in classical information processing. Yet, today's technological quality and scaling prevent exploiting its full potential. based on superconducting quantum processing units (QPUs) is among most promising approaches towards practical advantage. In this article basic approach IQM Computers described covering both QPU rest full-stack computer. particular, focus a 20-qubit computer featuring Garnet...