Loïc Henriet
Palaiseau, Île-de-France, France
3 k abonnés
+ de 500 relations
À propos
Building scalable quantum processors thanks to light and cold atoms at Pasqal…
Activité
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Exciting new quantum error correction results arxiv.org/abs/2408.13687 Congrats to the team at Google Quantum! They show a logical quantum memory…
Exciting new quantum error correction results arxiv.org/abs/2408.13687 Congrats to the team at Google Quantum! They show a logical quantum memory…
Aimé par Loïc Henriet
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I'm so so thrilled to see our first GothamQ paper formally published in my most favorite journal, PRX Quantum 🎉 (link at the end) I've published…
I'm so so thrilled to see our first GothamQ paper formally published in my most favorite journal, PRX Quantum 🎉 (link at the end) I've published…
Aimé par Loïc Henriet
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La start-up toulousaine Pili, fondée en 2015 à Toulouse par Jérémie Blache, Guillaume Boissonnat-Wu, Marie-Sarah Adenis et Thomas Landrain, vient…
La start-up toulousaine Pili, fondée en 2015 à Toulouse par Jérémie Blache, Guillaume Boissonnat-Wu, Marie-Sarah Adenis et Thomas Landrain, vient…
Aimé par Loïc Henriet
Expérience
Formation
Licences et certifications
Publications
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Subradiant states of quantum bits coupled to a one-dimensional waveguide
New Journal of Physics 21, 025003
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Critical open-system dynamics in a one-dimensional optical lattice clock
Physical Review A 99 (2), 023802
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Driven dissipative dynamics and topology of quantum impurity systems
Comptes Rendus Physique 19 (6), 451-483
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Engineering Quantum Spin Liquids and Many-Body Majorana States with a Driven Superconducting Box Circuit
Physical Review B 98 (3), 035431
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Topology of a dissipative spin: Dynamical Chern number, bath-induced nonadiabaticity, and a quantum dynamo effect
Phys. Rev. B 95, 054307, American Physical Society
We analyze the topological deformations of the ground state manifold of a quantum spin-1/2 in a magnetic field induced by a coupling to an ohmic quantum dissipative environment at zero temperature. From Bethe ansatz results and a variational approach, we confirm that the Chern number associated with the geometry of the reduced spin ground state manifold is preserved in the delocalized phase. We report a divergence of the Berry curvature at the critical coupling for magnetic fields aligned along…
We analyze the topological deformations of the ground state manifold of a quantum spin-1/2 in a magnetic field induced by a coupling to an ohmic quantum dissipative environment at zero temperature. From Bethe ansatz results and a variational approach, we confirm that the Chern number associated with the geometry of the reduced spin ground state manifold is preserved in the delocalized phase. We report a divergence of the Berry curvature at the critical coupling for magnetic fields aligned along the equator. This divergence is caused by the complete quenching of the transverse magnetic field by the bath associated with a gap closing that occurs at the localization Kosterlitz-Thouless quantum phase transition in this model. Recent experiments in quantum circuits have engineered nonequilibrium protocols to access topological properties from a measurement of a dynamical Chern number defined via the out-of-equilibrium spin expectation values. Applying a numerically exact stochastic Schrödinger approach we find that, for a fixed field sweep velocity, the bath induces a crossover from (quasi)adiabatic to nonadiabatic dynamical behavior when the spin bath coupling increases. We further provide an intuitive physical explanation of the bath-induced breakdown of adiabaticity in analogy to the Faraday effect in electromagnetism. We demonstrate that the driving of the spin leads to the production of a large number of bosonic excitations in the bath, which strongly affect the spin dynamics. Finally, we quantify the spin-bath entanglement and formulate an analogy with an effective model at thermal equilibrium.
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Many-body quantum electrodynamics networks: non-equilibrium condensed matter physics with light
Comptes Rendus Physique 17 (8), 808–835 2016
We review recent developments regarding the quantum dynamics and many-body physics with light, in superconducting circuits and Josephson analogues, by analogy with atomic physics. We start with quantum impurity models addressing dissipative and driven systems. Both theorists and experimentalists are making efforts towards the characterization of these non-equilibrium quantum systems. We show how Josephson junction systems can implement the equivalent of the Kondo effect with microwave photons…
We review recent developments regarding the quantum dynamics and many-body physics with light, in superconducting circuits and Josephson analogues, by analogy with atomic physics. We start with quantum impurity models addressing dissipative and driven systems. Both theorists and experimentalists are making efforts towards the characterization of these non-equilibrium quantum systems. We show how Josephson junction systems can implement the equivalent of the Kondo effect with microwave photons. The Kondo effect can be characterized by a renormalized light frequency and a peak in the Rayleigh elastic transmission of a photon. We also address the physics of hybrid systems comprising mesoscopic quantum dot devices coupled with an electromagnetic resonator. Then, we discuss extensions to Quantum Electrodynamics (QED) Networks allowing one to engineer the Jaynes–Cummings lattice and Rabi lattice models through the presence of superconducting qubits in the cavities. This opens the door to novel many-body physics with light out of equilibrium, in relation with the Mott–superfluid transition observed with ultra-cold atoms in optical lattices. Then, we summarize recent theoretical predictions for realizing topological phases with light. Synthetic gauge fields and spin–orbit couplings have been successfully implemented in quantum materials and with ultra-cold atoms in optical lattices — using time-dependent Floquet perturbations periodic in time, for example — as well as in photonic lattice systems. Finally, we discuss the Josephson effect related to Bose–Hubbard models in ladder and two-dimensional geometries, producing phase coherence and Meissner currents. The Bose–Hubbard model is related to the Jaynes–Cummings lattice model in the large detuning limit between light and matter (the superconducting qubits). In the presence of synthetic gauge fields, we show that Meissner currents subsist in an insulating Mott phase.
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Physique quantique et physique statistique. Cours détaillé, exercices corrigés et analyses de documents.
Ellipses
Cet ouvrage couvre les programmes de physique quantique de MP et PC, ainsi que le programme de physique statistique de MP. Il s’adresse aux étudiants de classes préparatoires et de licence universitaire, ainsi qu’aux candidats aux concours de l’enseignement.
Chaque chapitre comprend le cours détaillé et ses références, des questions sur le cours et des exercices corrigés, ainsi qu’une analyse de document scientifique corrigée et une ouverture sur un point théorique ou expérimental « pour…Cet ouvrage couvre les programmes de physique quantique de MP et PC, ainsi que le programme de physique statistique de MP. Il s’adresse aux étudiants de classes préparatoires et de licence universitaire, ainsi qu’aux candidats aux concours de l’enseignement.
Chaque chapitre comprend le cours détaillé et ses références, des questions sur le cours et des exercices corrigés, ainsi qu’une analyse de document scientifique corrigée et une ouverture sur un point théorique ou expérimental « pour aller plus loin ».
Ce livre présente les bases historiques et théoriques de la mécanique quantique ondulatoire, de l’effet photoélectrique à l’équation de Schrödinger et ses conséquences.
L’introduction à la physique statistique concerne les systèmes en équilibre thermique avec un thermostat. Partant de la loi de Boltzmann, l’étude porte à la fois sur les systèmes à niveaux d’énergie discrets et continus. -
Quantum sweeps, synchronization, and Kibble-Zurek physics in dissipative quantum spin systems
Phys. Rev. B 93, 064411, American Physical Society
We address dissipation effects on the nonequilibrium quantum dynamics of an ensemble of spins-12 coupled via an Ising interaction. Dissipation is modeled by a (Ohmic) bath of harmonic oscillators at zero temperature and correspond either to the sound modes of a one-dimensional Bose-Einstein (quasi-)condensate or to the zero-point fluctuations of a long transmission line. We consider the dimer comprising two spins and the quantum Ising chain with long-range interactions and develop an…
We address dissipation effects on the nonequilibrium quantum dynamics of an ensemble of spins-12 coupled via an Ising interaction. Dissipation is modeled by a (Ohmic) bath of harmonic oscillators at zero temperature and correspond either to the sound modes of a one-dimensional Bose-Einstein (quasi-)condensate or to the zero-point fluctuations of a long transmission line. We consider the dimer comprising two spins and the quantum Ising chain with long-range interactions and develop an (mathematically and numerically) exact stochastic approach to address nonequilibrium protocols in the presence of an environment. For the two-spin case, we first investigate the dissipative quantum phase transition induced by the environment through quantum quenches and study the effect of the environment on the synchronization properties. Then we address Landau-Zener-Stueckelberg-Majorana protocols for two spins and for the spin array. In this latter case, we adopt a stochastic mean-field point of view and present a Kibble-Zurek-type argument to account for interaction effects in the lattice. Such dissipative quantum spin arrays can be realized in ultracold atoms, trapped ions, and mesoscopic systems and are related to Kondo lattice models.
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Electrical current from quantum vacuum fluctuations in nanoengines
Phys. Rev. B 92, 125306, American Physical Society
We theoretically investigate a quantum dot coupled to fermionic (electronic) leads and show how zero-point quantum fluctuations stemming from bosonic environments permit the rectification of the current. The bosonic baths are either external impedances modeled as tunable transmission lines or LC resonators (single-mode cavities). Voltage fluctuations stemming from the external impedances at zero temperature are described through harmonic oscillators (photon-like excitations) producing the…
We theoretically investigate a quantum dot coupled to fermionic (electronic) leads and show how zero-point quantum fluctuations stemming from bosonic environments permit the rectification of the current. The bosonic baths are either external impedances modeled as tunable transmission lines or LC resonators (single-mode cavities). Voltage fluctuations stemming from the external impedances at zero temperature are described through harmonic oscillators (photon-like excitations) producing the quantum vacuum fluctuations. The differing sizes of the zero-point fluctuations of the quantum vacuum break the spatial symmetry of the system if the quantum dot is coupled to two reservoirs or two junctions with different bosonic environments. We consider current rectification and power production when the system is operated as a heat engine in both non-resonant and resonant sequential tunneling cases.
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Environment-induced synchronization of two quantum oscillators
Physical Review A 100 (02), 2119
Spontaneous synchronization between coupled periodic systems occur in a wealth of classical physical setups. Here, we show theoretically that the phase of two distinct quantum harmonic oscillators spontaneously synchronize when they are strongly coupled to a common bosonic quantum dissipative environment at zero temperature, in the absence of any driving mechanism. To do so, we compute the dynamics of the oscillators with an exact master equation obtained from a path integral formalism. Above…
Spontaneous synchronization between coupled periodic systems occur in a wealth of classical physical setups. Here, we show theoretically that the phase of two distinct quantum harmonic oscillators spontaneously synchronize when they are strongly coupled to a common bosonic quantum dissipative environment at zero temperature, in the absence of any driving mechanism. To do so, we compute the dynamics of the oscillators with an exact master equation obtained from a path integral formalism. Above some value of the system-environment coupling strength, we observe numerically a strongly reduced damping and a frequency locking in the dynamics of the oscillators. Beyond the synchronization mechanism, we also describe the rich phenomenology of the dynamics in the model and notably identify the additional emergence of a regime with long-lived oscillations.
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Quantum dynamics of the driven and dissipative Rabi Model
Phys. Rev. A 90, 023820, American Physical Society
The Rabi model considers a two-level system (or spin-1/2) coupled to a quantized harmonic oscillator and describes the simplest interaction between matter and light. The recent experimental progress in solid-state circuit quantum electrodynamics has engendered theoretical efforts to quantitatively describe the mathematical and physical aspects of the light-matter interaction beyond the rotating wave approximation. We develop a stochastic non-perturbative Schr\"{o}dinger equation approach which…
The Rabi model considers a two-level system (or spin-1/2) coupled to a quantized harmonic oscillator and describes the simplest interaction between matter and light. The recent experimental progress in solid-state circuit quantum electrodynamics has engendered theoretical efforts to quantitatively describe the mathematical and physical aspects of the light-matter interaction beyond the rotating wave approximation. We develop a stochastic non-perturbative Schr\"{o}dinger equation approach which enables us to access the strong-coupling limit of the Rabi model and study the effects of dissipation and AC drive in an exact manner. We consider the high-Q cavity limit and include the effect of ohmic noise on the non-Markovian spin dynamics resulting in Kondo-type correlations. We compute the time evolution of spin variables in various conditions. As a scope, we discuss the possibility to reach a steady state with one polariton in realistic experimental conditions.
Plus d’activités de Loïc
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I’m pleased to share that our latest research paper has been published in PRX Quantum. Collaborating with Aniket Rath, we employed randomized…
I’m pleased to share that our latest research paper has been published in PRX Quantum. Collaborating with Aniket Rath, we employed randomized…
Aimé par Loïc Henriet
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A leading expert and professor in quantum physics professor warns the quantum community must be careful about overhyping the capabilities of quantum…
A leading expert and professor in quantum physics professor warns the quantum community must be careful about overhyping the capabilities of quantum…
Aimé par Loïc Henriet
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We are thrilled to announce Toshiba's strategic investment in Quantonation II, a leading quantum technology fund operated by Quantonation Ventures.…
We are thrilled to announce Toshiba's strategic investment in Quantonation II, a leading quantum technology fund operated by Quantonation Ventures.…
Aimé par Loïc Henriet
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Toshiba Invests in Quantonation II 🌐 We are thrilled to announce Toshiba's strategic investment in Quantonation II, a leading quantum technology…
Toshiba Invests in Quantonation II 🌐 We are thrilled to announce Toshiba's strategic investment in Quantonation II, a leading quantum technology…
Aimé par Loïc Henriet
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Researchers in Hannes Bernien's lab, including graduate students Noah Glachman, Shankar G Menon, and Matteo Pompili have discovered how to combine…
Researchers in Hannes Bernien's lab, including graduate students Noah Glachman, Shankar G Menon, and Matteo Pompili have discovered how to combine…
Aimé par Loïc Henriet
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Tomorrow #PASQAL will be at #ICML at 11:30 presenting our poster about using quantum-computed features of graphs to enhance the performance of graph…
Tomorrow #PASQAL will be at #ICML at 11:30 presenting our poster about using quantum-computed features of graphs to enhance the performance of graph…
Aimé par Loïc Henriet
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Kipu Quantum is here to bring useful #quantumcomputing to world, using near-term available quantum processors. This is no longer a matter of decades,…
Kipu Quantum is here to bring useful #quantumcomputing to world, using near-term available quantum processors. This is no longer a matter of decades,…
Aimé par Loïc Henriet
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We're excited to announce the collaboration between CMC Microsystems and Pasqal to accelerate the development and adoption of neutral-atom quantum…
We're excited to announce the collaboration between CMC Microsystems and Pasqal to accelerate the development and adoption of neutral-atom quantum…
Aimé par Loïc Henriet
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Happy to share that our latest research has been published in Science Magazine Congrats to the entire team at Max Planck Institute of Quantum…
Happy to share that our latest research has been published in Science Magazine Congrats to the entire team at Max Planck Institute of Quantum…
Aimé par Loïc Henriet
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We are honored to announce that three companies from our portfolio, Welinq, InSpek and QC Design have been awarded of the #EICAccelerator ! The…
We are honored to announce that three companies from our portfolio, Welinq, InSpek and QC Design have been awarded of the #EICAccelerator ! The…
Aimé par Loïc Henriet
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Thrilled to share that QC Design has been selected by the European Innovation Council and SMEs Executive Agency (EISMEA) in its prestigious EIC…
Thrilled to share that QC Design has been selected by the European Innovation Council and SMEs Executive Agency (EISMEA) in its prestigious EIC…
Aimé par Loïc Henriet
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