A5032260005- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Spectroscopy and Quantum Chemical Studies
- Advanced Thermodynamics and Statistical Mechanics
- Mechanical and Optical Resonators
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Quantum chaos and dynamical systems
- Laser-Matter Interactions and Applications
- Quantum, superfluid, helium dynamics
- Physics of Superconductivity and Magnetism
- Atomic and Subatomic Physics Research
- Quantum many-body systems
- Photonic and Optical Devices
- Nonlinear Dynamics and Pattern Formation
- Molecular Junctions and Nanostructures
- Experimental and Theoretical Physics Studies
- Radioactive Decay and Measurement Techniques
- Quantum and Classical Electrodynamics
- Reformation and Early Modern Christianity
- Phase-change materials and chalcogenides
- Nonlinear Photonic Systems
Yale University
2022-2025
Collège de France
2017-2021
Sorbonne Université
2017-2021
Laboratoire Kastler Brossel
2018-2021
Centre National de la Recherche Scientifique
2020-2021
École Normale Supérieure - PSL
2020-2021
Université Paris Sciences et Lettres
2020-2021
Quantum simulation can provide insight into physical systems that are too complex for traditional computing techniques. A new proposal describes how a quantum simulator could be realized using laser-trapped circular Rydberg atoms, whose long lifetimes and stability beneficial simulations lasting up to seconds.
Transmon qubits are the predominant element in circuit-based quantum information processing, such as existing computers, due to their controllability and ease of engineering implementation. But more than qubits, transmons multilevel nonlinear oscillators that can be used investigate fundamental physics questions. Here, they explored simulators excited state phase transitions (ESQPTs), which generalizations states. We show spectral kissing (coalescence pairs energy levels) experimentally...
Parametric gates and processes engineered from the perspective of static effective Hamiltonian a driven system are central to quantum technology. However, perturbative expansions used derive models may not be able efficiently capture all relevant physics original system. In this work, we investigate conditions for validity usual low-order describe Kerr oscillator under squeezing drive. This is fundamental technological interest. particular, it has been stabilize Schrödinger cat states, which...
By applying a microwave drive to specially designed Josephson circuit, we have realized double-well model system: Kerr oscillator submitted squeezing force. We observed, for the first time, spectroscopic fingerprint of quantum Hamiltonian when its barrier height is increased: pairwise level kissing (coalescence) corresponding exponential reduction tunnel splitting in excited states as they sink under barrier. The discrete levels wells also manifest themselves activation time across which,...
We present a recursive formula for the computation of static effective Hamiltonian system under fast-oscillating drive. Our analytical result is well-suited to symbolic calculations performed by computer and can be implemented arbitrary order, thus overcoming limitations existing time-dependent perturbation methods allowing computations that were impossible before. also provide simple diagrammatic tool calculation treat illustrative examples. By construction, our method applies directly both...
Bosonic quantum devices offer a novel approach to realize computations, where the two-level system (qubit) is replaced with (an)harmonic oscillator (qumode) as fundamental building block of simulator. The simulation chemical structure and dynamics can then be achieved by representing or mapping Hamiltonians in terms bosonic operators. In this perspective, we review recent progress future potential using for addressing wide range challenging problems, including calculation molecular vibronic...
We present the experimental finding of multiple simultaneous two-fold degeneracies in spectrum a Kerr oscillator subjected to squeezing drive. This drive resulting from three-wave mixing process, combination with interaction, creates an effective static two-well potential phase space rotating at half frequency sinusoidal generating squeezing. Remarkably, these can be turned on-and-off on demand, as well their number by simply adjusting find that when detuning Δ between and second subharmonic...
Rydberg atoms are remarkable tools for quantum simulation and computation. They the focus of an intense experimental activity, mainly based on low-angular-momentum states. Unfortunately, atomic motion levels lifetime limit timescale to about 100 μs. Here, we demonstrate two-dimensional laser trapping long-lived circular states up 10 ms. Our method is very general opens many opportunities technologies with atoms. The ms time corresponds thousands interaction cycles in a circular-state-based...
The quasienergy spectrum recently measured in experiments with a squeeze-driven superconducting Kerr oscillator showed good agreement the energy of its corresponding static effective Hamiltonian. also demonstrated that dynamics low-energy states can be explained same emergent model. exhibits real (avoided) level crossings for specific values Hamiltonian parameters, which then chosen to suppress (enhance) quantum tunneling. Here we analyze and model up high energies, should soon within...
Abstract Kerr parametric oscillators are potential building blocks for fault-tolerant quantum computers. They can stabilize Kerr-cat qubits, which offer advantages toward the encoding and manipulation of error-protected information. The recent realization qubits made use nonlinearity SNAIL transmon superconducting circuit a squeezing drive. Increasing nonlinearities enable faster gate times, but, as shown here, also induce chaos melt qubit away. We determine region validity discuss how its...
By applying a microwave drive to specially designed Josephson circuit, we have realized an elementary quantum optics model, the squeezed Kerr oscillator. This model displays, as squeezing amplitude is increased, cross-over from single ground state regime doubly-degenerate regime. In latter case, manifold spanned by Schr\"odinger-cat states, i.e. superpositions of coherent states with opposite phases. For first time, having resolved up tenth excited in spectroscopic experiment, confirm that...
Abstract We study the symmetries of static effective Hamiltonian a driven superconducting nonlinear oscillator, so-called squeeze-driven Kerr Hamiltonian, and discover remarkable quasi-spin symmetry su (2) at integer values ratio <?CDATA $\eta = \Delta /K$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>η</mml:mi> <mml:mo>=</mml:mo> <mml:mi mathvariant="normal">Δ</mml:mi> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>K</mml:mi> </mml:math> detuning...
The authors propose a laser tweezer configuration that can trap Rydberg atom by exploiting the size and geometry of its wave function. trap, which naturally ground-state atoms too, be tuned to put state in highly quantum hula-hoop-like motion.
Chemical reactions are commonly described by the reactive flux transferring population from reactants to products across a double-well free energy barrier. Dynamics often involves barrier recrossing and quantum effects like tunneling, zero-point motion, interference, which traditional rate theories, such as transition-state theory, do not consider. In this study, we investigate feasibility of simulating reaction dynamics using parametrically driven bosonic superconducting Kerr-cat device....
Dissipative tunneling remains a cornerstone effect in quantum mechanics. In chemistry, it plays crucial role governing the rates of chemical reactions, often modeled as motion along reaction coordinate from one potential well to another. The relative positions energy levels these wells strongly influences dynamics. Chemical research will benefit fully controllable, asymmetric double-well equipped with precise measurement capabilities rates. this paper, we show that continuously driven Kerr...
Abstract The quantum to classical transition is determined by the interplay of a trio parameters: dissipation, nonlinearity, and macroscopicity. Why nonlinearity needed see effects? And, not an ordinary pendulum quite nonlinear already? In this manuscript, we discuss parameter regime where dynamics massive oscillator should be mechanical in presence dissipation. We review outstanding challenge dynamical generation highly cat states ‘pendulum’, known as Kerr-cats. argue that state-of-the-art...
In this work, we present a new method, based on Feynman-like diagrams, for computing the effective Hamiltonian of driven nonlinear oscillators. The pictorial structure associated with each diagram corresponds directly to term, prefactor which involves simple counting topologically equivalent diagrams. We also leverage algorithmic simplicity our scheme in readily available computer program that generates arbitrary order. At heart diagrammatic method is novel canonical perturbation expansion...
We introduce a general method based on the operators of Dyson-Masleev transformation to map Hamiltonian an arbitrary model system into circuit Quantum Electrodynamics (cQED) processor. Furthermore, we modular approach programming cQED processor with components corresponding mapping Hamiltonian. The is illustrated as applied quantum dynamics simulations Fenna-Matthews-Olson (FMO) complex and spin-boson charge transfer. Beyond applications molecular Hamiltonians, provides implement any unitary...
The exquisite properties of Rydberg levels make them particularly appealing for emerging quantum technologies. lifetime low-angular-momentum laser-accessible is however limited to a few $100\,\mu\mathrm{s}$ by optical transitions and microwave blackbody radiation (BBR) induced transfers at room temperature. A considerable improvement would be obtained with the $10\,\mathrm{ms}$ circular in cryogenic environment reducing BBR We demonstrate preparation long-lived laser-cooled Rubidium atoms...
Abstract Transmon qubits are the predominant element in circuit-based quantum information processing, such as existing computers, due to their controllability and ease of engineering implementation. But more than qubits, transmons multilevel nonlinear oscillators that can be employed discovery new fundamental physics. Here, they explored simulators excited state phase transitions (ESQPTs), which generalizations states. We show spectral kissing (coalescence pairs energy levels) experimentally...
Transmon qubits are the predominant element in circuit-based quantum information processing, such as existing computers, due to their controllability and ease of engineering implementation. But more than qubits, transmons multilevel nonlinear oscillators that can be used investigate fundamental physics questions. Here, they explored simulators excited state phase transitions (ESQPTs), which generalizations states. We show spectral kissing (coalescence pairs energy levels) experimentally...