195 citations · 946 across the 16 of their papers we have counts for
16 papers
Exploiting non-i.i.d. data towards more robust machine learning algorithms
Wim Casteels, Peter Hellinckx
In the field of machine learning there is a growing interest towards more robust and generalizable algorithms. This is for example important to bridge the gap between the environme…
Ground state properties of interacting Bose polarons
Senne Van Loon, Wim Casteels, Jacques Tempere
We theoretically investigate the role of multiple impurity atoms on the ground state properties of Bose polarons. The Bogoliubov approximation is applied for the description of the…
Spontaneous Beliaev-Landau scattering out of equilibrium
Mathias Van Regemortel, Wim Casteels, Iacopo Carusotto +1
We investigate Beliaev-Landau scattering in a gas of interacting photons in a coherently driven array of nonlinear dissipative resonators, as described by the 1D driven-dissipative…
Optically bistable driven-dissipative Bose-Hubbard dimer: Gutzwiller approaches and entanglement
Wim Casteels, Michiel Wouters
We theoretically examine the driven-dissipative Bose-Hubbard dimer in the optical bistable regime. Various approximation schemes based on a Gutzwiller mean field decoupling are app…
On the robustness of strongly correlated multi-photon states in frustrated driven-dissipative cavity lattices
Riccardo Rota, Wim Casteels, Cristiano Ciuti
We present a theoretical study on the robustness of multi-photon states in a frustrated lattice of coupled nonlinear optical cavities, which are described by a driven-dissipative B…
Critical dynamical properties of a first-order dissipative phase transition
Wim Casteels, Rosario Fazio, Cristiano Ciuti
We theoretically investigate the critical properties of a single driven-dissipative nonlinear photon mode. In a well-defined thermodynamical limit of large excitation numbers, the…
Exact steady state of a Kerr resonator with one- and two-photon driving and dissipation: Controllable Wigner-function multimodality and dissipative phase transitions
Nicola Bartolo, Fabrizio Minganti, Wim Casteels +1
We present exact results for the steady-state density matrix of a general class of driven-dissipative systems consisting of a nonlinear Kerr resonator in the presence of both coher…
Quantum entanglement in the spatial symmetry breaking phase transition of a driven-dissipative Bose-Hubbard dimer
Wim Casteels, Cristiano Ciuti
We theoretically explore quantum correlation properties of a dissipative Bose-Hubbard dimer in presence of a coherent drive. In particular, we focus on the regime where the semicla…
Truncated correlation hierarchy schemes for driven-dissipative multimode quantum systems
Wim Casteels, Stefano Finazzi, Alexandre Le Boité +2
We present a method to describe driven-dissipative multi-mode systems by considering a truncated hierarchy of equations for the correlation functions. We consider two hierarchy tru…
Exact results for Schrödinger cats in driven-dissipative systems and their feedback control
F. Minganti, N. Bartolo, J. Lolli +2
In quantum optics, photonic Schrödinger cats are superpositions of two coherent states with opposite phases and with a significant number of photons. Recently, these states have be…
Power-laws in the dynamic hysteresis of quantum nonlinear photonic resonators
W. Casteels, F. Storme, A. Le Boité +1
We explore theoretically the physics of dynamic hysteresis for driven-dissipative nonlinear photonic resonators. In the regime where the semiclassical mean-field theory predicts bi…
Polaron formation in the vicinity of a narrow Feshbach resonance in atomic and exciton-polariton condensates
Wim Casteels, Michiel Wouters
The polaronic system consisting of an impurity in a dilute Bose-Einstein condensate is considered in the presence of a narrow Feshbach resonance. For this purpose a coupled-channel…
Diagrammatic Monte Carlo study of the acoustic and the BEC polaron
Jonas Vlietinck, Wim Casteels, Kris Van Houcke +3
We consider two large polaron systems that are described by a Fröhlich type of Hamiltonian, namely the Bose-Einstein condensate (BEC) polaron in the continuum and the acoustic pola…
Bipolarons and multi-polarons consisting of impurity atoms in a Bose-Einstein condensate
W. Casteels, J. Tempere, J. T. Devreese
The variational Feynman formalism for the polaron, extended to an all-coupling treatment of bipolarons, is applied for two impurity atoms in a Bose-Einstein condensate. This shows…
Polaronic properties of an impurity in a Bose-Einstein condensate in reduced dimensions
W. Casteels, J. Tempere, J. T. Devreese
The application of optical lattices allows a tuning of the geometry of Bose-Einstein condensates to effectively reduced dimensions. In the context of solid state physics the consid…
Response of the polaron system consisting of an impurity in a Bose-Einstein condensate to Bragg spectroscopy
W. Casteels, J. Tempere, J. T. Devreese
We expand the existing polaron response theory, expressed within the Mori-Zwanzig projection operator formalism applicable for the transfer of arbitrary energy and zero momentum, t…