V. E. Colussi
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View article: Probing the Critical Point (CritPt) of AI Reasoning: a Frontier Physics Research Benchmark
Probing the Critical Point (CritPt) of AI Reasoning: a Frontier Physics Research Benchmark Open
While large language models (LLMs) with reasoning capabilities are progressing rapidly on high-school math competitions and coding, can they reason effectively through complex, open-ended challenges found in frontier physics research? And …
View article: Lattice Bose polarons at strong coupling and quantum criticality
Lattice Bose polarons at strong coupling and quantum criticality Open
The problem of mobile impurities in quantum baths is of fundamental importance in many-body physics. There has recently been significant progress regarding our understanding of this due to cold atom experiments, but so far it has mainly be…
View article: Probing non-Gaussian correlations through entanglement generation in a many-body quantum system
Probing non-Gaussian correlations through entanglement generation in a many-body quantum system Open
In understanding strongly correlated quantum systems, quantifying the non-Gaussian nature of interparticle correlations is invaluable. We show that, for a uniform quantum gas, there exists a natural connection between non-Gaussian correlat…
View article: Probing non-Gaussian correlations through entanglement generation in a many-body quantum system
Probing non-Gaussian correlations through entanglement generation in a many-body quantum system Open
In understanding strongly correlated quantum systems, quantifying the non-Gaussian nature of interparticle correlations is invaluable. We show that, for a uniform quantum gas, there exists a natural connection between non-Gaussian correlat…
View article: Lattice Bose polarons at strong coupling and quantum criticality
Lattice Bose polarons at strong coupling and quantum criticality Open
We develop a new theoretical framework for exploring a mobile impurity interacting strongly with a highly correlated bath of bosons in the quantum critical regime of a Mott insulator (MI) to superfluid (SF) quantum phase transition. Our fr…
View article: Programming an Optical Lattice Interferometer
Programming an Optical Lattice Interferometer Open
Programming a quantum device describes the usage of quantum logic gates, agnostic of hardware specifics, to perform a sequence of operations with (typically) a computing or sensing task in mind. Such programs have been executed on digital …
View article: Nonequilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures
Nonequilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures Open
Theoretical treatments of nonequilibrium dynamics in strongly interacting Bose-Fermi mixtures are complicated by the inherent non-Gaussian nature of the vacuum two-body physics, invalidating the typical Hartree-Fock-Bogoliubov approximatio…
View article: Non-equilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures
Non-equilibrium dynamics and atom-pair coherence in strongly interacting Bose-Fermi mixtures Open
Theoretical treatments of non-equilibrium dynamics in strongly interacting Bose-Fermi mixtures are complicated by the inherent non-Gaussian nature of the vacuum two-body physics, invalidating the typical Hartree-Fock-Bogoliubov approximati…
View article: Variational quantum state preparation for quantum-enhanced metrology in noisy systems
Variational quantum state preparation for quantum-enhanced metrology in noisy systems Open
We investigate optimized quantum state preparation for quantum metrology applications in noisy environments. Using the QFI-Opt package, we simulate a low-depth variational quantum circuit (VQC) composed of a sequence of global rotations an…
View article: Higgs Oscillations in a Unitary Fermi Superfluid
Higgs Oscillations in a Unitary Fermi Superfluid Open
International audience
View article: Robust Quantum Sensing with Multiparameter Decorrelation
Robust Quantum Sensing with Multiparameter Decorrelation Open
The performance of a quantum sensor is fundamentally limited by noise. This noise is particularly damaging when it becomes correlated with the readout of a target signal, caused by fluctuations of the sensor's operating parameters. These u…
View article: Interaction quenches in nonzero-temperature fermionic condensates
Interaction quenches in nonzero-temperature fermionic condensates Open
International audience
View article: Resonance triplet dynamics in the quenched unitary Bose gas
Resonance triplet dynamics in the quenched unitary Bose gas Open
The quenched unitary Bose gas is a paradigmatic example of a strongly interacting out-of-equilibrium quantum system, whose dynamics become difficult to describe theoretically due to the growth of non-Gaussian quantum correlations. We devel…
View article: Efimov Physics in Quenched Unitary Bose Gases
Efimov Physics in Quenched Unitary Bose Gases Open
We study the impact of three-body physics in quenched unitary Bose gases, focusing on the role of the Efimov effect. Using a local density model, we solve the three-body problem and determine three-body decay rates at unitarity, finding de…
View article: Interaction quenches in nonzero temperature fermionic condensates
Interaction quenches in nonzero temperature fermionic condensates Open
We revisit the study of amplitude oscillations in a pair condensate of fermions after an interaction quench, and generalize it to nonzero temperature. For small variations of the order parameter, we show that the energy transfer during the…
View article: Higgs oscillations in a unitary Fermi superfluid
Higgs oscillations in a unitary Fermi superfluid Open
Symmetry-breaking phase transitions are central to our understanding of states of matter. When a continuous symmetry is spontaneously broken, new excitations appear that are tied to fluctuations of the order parameter. In superconductors a…
View article: Resonance triplet dynamics in the quenched unitary Bose gas
Resonance triplet dynamics in the quenched unitary Bose gas Open
The quenched unitary Bose gas is a paradigmatic example of a strongly interacting out-of-equilibrium quantum system, whose dynamics become difficult to describe theoretically due to the growth of non-Gaussian quantum correlations. We devel…
View article: Evolution of the unitary Bose gas for broad to narrow Feshbach resonances
Evolution of the unitary Bose gas for broad to narrow Feshbach resonances Open
We study the postquench dynamics of unitary Bose gases using a two-channel model, focusing on the effect of variations in the width of the Feshbach resonance due to density changes. We generally find that increasing the density leads to a …
View article: Quantum Gutzwiller approach for the two-component Bose-Hubbard model
Quantum Gutzwiller approach for the two-component Bose-Hubbard model Open
We study the effects of quantum fluctuations in the two-component Bose-Hubbard model generalizing to mixtures the quantum Gutzwiller approach introduced recently in [Phys. Rev. Research 2, 033276 (2020)]. As a basis for our study, we analy…
View article: Optimization of the variational quantum eigensolver for quantum chemistry applications
Optimization of the variational quantum eigensolver for quantum chemistry applications Open
This work studies the variational quantum eigensolver (VQE) algorithm, which is designed to determine the ground state of a quantum mechanical system by combining classical and quantum hardware. Two methods of reducing the number of requir…
View article: Evolution of the unitary Bose gas for broad to narrow Feshbach resonances
Evolution of the unitary Bose gas for broad to narrow Feshbach resonances Open
We study the post-quench dynamics of unitary Bose gases using a two-channel model, focusing on the effect of variations in the width of the Feshbach resonance due to density changes. We generally find that increasing the density leads to a…
View article: Report on 2110.13095v1
Report on 2110.13095v1 Open
We study the effects of quantum fluctuations in the two-component Bose-Hubbard model generalizing to mixtures the quantum Gutzwiller approach introduced recently in [Phys.Rev. Research 2, 033276 (2020)].As a basis for our study, we analyze…
View article: Report on 2110.13095v1
Report on 2110.13095v1 Open
We study the effects of quantum fluctuations in the two-component Bose-Hubbard model generalizing to mixtures the quantum Gutzwiller approach introduced recently in [Phys.Rev. Research 2, 033276 (2020)].As a basis for our study, we analyze…
View article: Three-body spin mixing in spin-1 Bose-Einstein condensates
Three-body spin mixing in spin-1 Bose-Einstein condensates Open
We study zero-energy collisions between three identical bosons with spin f=1 interacting via pairwise potentials. We quantify the corresponding three-body scattering hypervolumes, which parametrize the effective three-body interaction stre…
View article: Bose-Einstein condensation of Efimovian triples in the unitary Bose gas
Bose-Einstein condensation of Efimovian triples in the unitary Bose gas Open
In an atomic Bose-Einstein condensate quenched to the unitary regime, we predict the sequential formation of a significant fraction of condensed pairs and triples. At short-distances, we demonstrate the two-body and Efimovian character of …
View article: Three-body universality in ultracold <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-wave resonant mixtures
Three-body universality in ultracold -wave resonant mixtures Open
We study three-body collisions within ultracold mixtures with resonant interspecies $p$-wave interactions. Our results for the three-body effective interaction strength and decay rate are crucial towards understanding the stability and lif…
View article: Optimization of the Variational Quantum Eigensolver for Quantum Chemistry Applications
Optimization of the Variational Quantum Eigensolver for Quantum Chemistry Applications Open
This work studies the variational quantum eigensolver algorithm, designed to determine the ground state of a quantum mechanical system by combining classical and quantum hardware. Methods of reducing the number of required qubit manipulati…
View article: Three-body universality in ultracold $p$-wave resonant mixtures
Three-body universality in ultracold $p$-wave resonant mixtures Open
We study three-body collisions within ultracold mixtures with resonant interspecies $p$-wave interactions. Our results for the three-body effective interaction strength and decay rate are crucial towards understanding the stability and lif…
View article: Cumulant theory of the unitary Bose gas: Prethermal and Efimovian dynamics
Cumulant theory of the unitary Bose gas: Prethermal and Efimovian dynamics Open
We study the quench of a degenerate ultracold Bose gas to the unitary regime, where interactions are as strong as allowed by quantum mechanics. We lay the foundations of a cumulant theory able to capture simultaneously the three-body Efimo…