A5020954364- Quantum many-body systems
- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
- Quantum Computing Algorithms and Architecture
- Quantum optics and atomic interactions
- Theoretical and Computational Physics
- Strong Light-Matter Interactions
- Mechanical and Optical Resonators
- Topological Materials and Phenomena
- Parallel Computing and Optimization Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Mechanics and Applications
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Quantum Chromodynamics and Particle Interactions
- Quantum Electrodynamics and Casimir Effect
- Machine Learning in Materials Science
- Nonlinear Photonic Systems
- Stochastic processes and statistical mechanics
- Magnetic confinement fusion research
- Random Matrices and Applications
- Black Holes and Theoretical Physics
University of the Basque Country
2016-2025
Ikerbasque
2015-2025
Donostia International Physics Center
2023-2025
European Organization for Nuclear Research
2025
Barcelona Supercomputing Center
2019
Universitat Politècnica de Catalunya
2019
Institute for High Energy Physics
2019
Université de Strasbourg
2014-2016
Institut de Physique et Chimie des Matériaux de Strasbourg
2014-2016
Centre National de la Recherche Scientifique
2014-2016
Entanglement, one of the most intriguing features quantum theory and a main resource in information science, is expected to play crucial role also study phase transitions, where it responsible for appearance long-range correlations. We investigate, through microscopic calculation, scaling properties entanglement spin chain systems, both near at critical point. Our results establish precise connection between concepts information, condensed matter physics, field theory, by showing that...
In the ultrastrong coupling regime, light and matter can no longer be distinguished: their strengths are as large own energy scales. Even for simple two-level systems, this represents a new regime to explore within quantum Rabi model. There has been considerable theoretical experimental progress on physics of these systems in recent years, presented review. Key results discussed set current platforms arising information research, including superconducting semiconducting devices, other hybrid systems.
Lattice gauge theories, which originated from particle physics in the context of Quantum Chromodynamics (QCD), provide an important intellectual stimulus to further develop quantum information technologies. While one long-term goal is reliable simulation currently intractable aspects QCD itself, lattice theories also play role condensed matter and science. In this way, both motivation a framework for interdisciplinary research towards development special purpose digital analog simulators,...
A microscopic calculation of ground state entanglement for the XY and Heisenberg models shows emergence universal scaling behavior at quantum phase transitions. Entanglement is thus controlled by conformal symmetry. Away from critical point, gets saturated a mass scale. Results borrowed field theory imply irreversibility loss along renormalization group trajectories. does not saturate in higher dimensions which appears to limit success density matrix technique. possible connection between...
A microscopic calculation of ground state entanglement for the XY and Heisenbergmodels shows emergence universal scaling behavior at quantum phase transitions,Entanglement is thus controlled by conformal symmetry, Away from critical point,entanglement gets saturated a mass scale, Results borrowed fieldtheory imply irreversibility loss along renormalization group trajecto-ries. Entanglement does not saturate in higher dimensions which appears to limit thesuccess density matrix technique....
Using a Fermi-Bose mixture of ultracold atoms in an optical lattice, we construct quantum simulator for U(1) gauge theory coupled to fermionic matter. The construction is based on links which realize continuous symmetry with discrete variables. At low energies, link models staggered fermions emerge from Hubbard-type model can be simulated. This allows us investigate string breaking as well the real-time evolution after quench theories, are inaccessible classical simulation methods.
Topological states of fermionic matter can be induced by means a suitably engineered dissipative dynamics. Dissipation then does not occur as perturbation, but rather the main resource for many-body dynamics, providing targeted cooling into topological phases starting from arbitrary initial states. We explore concept order in this setting, developing and applying general theoretical framework based on system density matrix that replaces wave function appropriate discussion Hamiltonian...
Using ultracold alkaline-earth atoms in optical lattices, we construct a quantum simulator for U(N) and SU(N) lattice gauge theories with fermionic matter based on link models. These systems share qualitative features QCD, including chiral symmetry breaking restoration at nonzero temperature or baryon density. Unlike classical simulations, does not suffer from sign problems can address the corresponding dynamics real time.
Tensor network algorithms provide a suitable route for tackling real-time dependent problems in lattice gauge theories, enabling the investigation of out-of-equilibrium dynamics. We analyze U(1) theory (1+1) dimensions presence dynamical matter different mass and electric field couplings, akin to quantum-electrodynamics one-dimension, which displays string-breaking: confining string between charges can spontaneously break during quench experiments, giving rise charge-anticharge pairs...
Quantum computers offer an intriguing path for a paradigmatic change of computing in the natural sciences and beyond, with potential achieving so-called quantum advantage—namely, significant (in some cases exponential) speedup numerical simulations. The rapid development hardware devices various realizations qubits enables execution small-scale but representative applications on computers. In particular, high-energy physics community plays pivotal role accessing power computing, since field...
We analyze the entanglement entropy in Lipkin-Meshkov-Glick model, which describes mutually interacting spin 1/2 embedded a magnetic field. This displays singularity at critical point that we study as function of interaction anisotropy, field, and system size. Results emerging from our analysis are surprisingly similar to those found for one- dimensional $XY$ chain.
We construct a general renormalization-group transformation on quantum states, independent of any Hamiltonian dynamics the system. illustrate this procedure for translational invariant matrix product states in one dimension and show that product, Greenberger-Horne-Zeilinger, W, domain wall are special cases an emerging classification fixed points coarse-graining transformation.
We show that gauge invariant quantum link models, Abelian and non-Abelian, can be exactly described in terms of tensor networks states. Quantum models represent an ideal bridge between high-energy cold atom physics, as they used atoms optical lattices to study lattice theories. In this framework, we characterize the phase diagram a $(1+1)\mathrm{D}$ version Schwinger model external classical background electric field: transition from charge parity ordered with nonzero flux disordered one net...
We propose a superconducting circuit to implement two-photon quantum Rabi model in solid-state device, where qubit and resonator are coupled by interaction. analyze the input-output relations for this strong-coupling regime find that fundamental quantum-optical phenomena qualitatively modified. For instance, interactions shown yield single- or blockade when pumping field is either applied cavity mode qubit, respectively. In addition, we derive an effective Hamiltonian perturbative...
We describe a superconducting-circuit lattice design for the implementation and simulation of dynamical gauge theories. illustrate our proposal by analyzing one-dimensional U(1) quantum-link model, where superconducting qubits play role matter fields on sites are represented two coupled microwave resonators each link between neighboring sites. A detailed analysis minimal experimental protocol probing physics related to string breaking effects shows that despite presence decoherence in these...
We propose a digital quantum simulator of non-Abelian pure-gauge models with superconducting circuit setup. Within the framework link models, we build minimal instance pure SU(2) gauge theory, using triangular plaquettes involving geometric frustration. This realization is least demanding, in terms simulation resources, dynamics. present two architectures that can host simulation, estimating requirements needed to run possible experiments. The proposal establishes path experimental physics...
A quantum simulator of [Formula: see text] lattice gauge theories can be implemented with superconducting circuits. This allows the investigation confined and deconfined phases in link models, valence bond solid spin liquid dimer models. Fractionalized confining strings real-time dynamics phase transitions are accessible as well. Here we show how state-of-the-art technology us to simulate these phenomena relatively small circuit lattices. By exploiting strong non-linear couplings between...
We investigate dissipation-induced p-wave paired states of fermions in two dimensions and show the existence spatially separated Majorana zero modes a phase with vanishing Chern number. construct an explicit natural model dissipative vortex that traps single these modes, establish its topological origin by mapping problem to chiral one-dimensional wire where we observe non-equilibrium transition characterized abrupt change invariant (winding number). mode core is intimately tied nature our...
There has been a growing interest in realizing quantum simulators for physical systems where perturbative methods are ineffective. The scalability and flexibility of circuit electrodynamics (cQED) make it promising platform to implement various types simulators, including lattice models strongly-coupled field theories. Here, we use multimode superconducting parametric cavity as hardware-efficient analog simulator, synthetic dimensions with complex hopping interactions. coupling graph,...
Quantum computers offer an intriguing path for a paradigmatic change of computing in the natural sciences and beyond, with potential achieving so-called quantum advantage, namely significant (in some cases exponential) speed-up numerical simulations. The rapid development hardware devices various realizations qubits enables execution small scale but representative applications on computers. In particular, high-energy physics community plays pivotal role accessing power computing, since field...
We explore entanglement loss along renormalization group trajectories as a basic quantum information property underlying their irreversibility. This analysis is carried out for the Ising chain transverse magnetic field changed. consider ground-state between large block of spins and rest chain. Entanglement seen to follow from rigid reordering, satisfying majorization relation, eigenvalues reduced density matrix spin block. More generally, our results indicate that it may be possible prove...
We present a unified framework to describe lattice gauge theories by means of tensor networks: this is efficient as it exploits the high local symmetry content native these systems describing only invariant subspace. Compared standard network description, model allows one increase real and imaginary time evolution up factor that square dimension link variable. The description based on quantum formulation, compact intuitive formulation for lattice, which alternative can be combined with...
We prove, by means of a unified treatment, that the superradiant phase transitions Dicke and classical oscillator limits simple light-matter models are indeed same type. show mean-field approximation is exact in both cases, compute structure location parameter space. extend this study to fuller range models, paying special attention symmetry considerations. uncover general features space parameters these models.
We investigate how the dynamical Casimir effect can entangle quantum systems in different coupling regimes of circuit electrodynamics, and show robustness such entanglement generation against dissipative effects with current technology. consider two qubit-resonator systems, which are coupled by a SQUID driven an external magnetic field, explore entire range between each qubit its respective resonator. In this scheme, we derive semianalytic explanation for both superconducting qubits when...