Publications (15)
Bayesian optimization of laser-plasma accelerators assisted by reduced physical models
A. Ferran Pousa, S. Jalas, M. Kirchen +7
Particle-in-cell simulations are among the most essential tools for the modeling and optimization of laser-plasma accelerators, since they reproduce the physics from first principl…
A partition theorem for a large dense linear order
M. Dzamonja, J. Larson, W. Mitchell
Let Q_K=(Q,<_Q)$ be a strongly K-dense linear order of size K for a suitable cardinal K. We prove, for all integers m > 1 that there is a finite value t_m^+ such that the set of al…
Level crossings in a cavity QED model
J. Larson
In this paper I study the dynamics of a two-level atom interacting with a standing wave field. When the atom is subjected to a weak linear force, the problem can be turned into a t…
Dynamics of a Raman coupled model: entanglement and quantum computation
J. Larson, B. M. Garraway
The evolution of a Raman coupled three-level lambda atom with two quantized cavity modes is studied in the large detuning case; i.e. when the upper atomic level can be adiabaticall…
Multiband bosons in optical lattices
J. Larson, A. Collin, J. -P. Martikainen
We study a gas of repulsively interacting bosons in an optical lattice and explore the physics beyond the lowest band Hubbard model. Utilizing a generalized Gutzwiller ansatz, we f…
Validity of adiabaticity in Cavity QED
J. Larson, S. Stenholm
This paper deals with the concept of adiabaticity for fully quantum mechanically cavity QED models. The physically interesting cases of Gaussian and standing wave shapes of the cav…
Dark solitons near the Mott-insulator--superfluid phase transition
K. V. Krutitsky, J. Larson, M. Lewenstein
Dark solitons of ultracold bosons in the vicinity of the Mott-insulator--superfluid phase transition are studied. Making use of the Gutzwiller ansatz we have found antisymmetric ei…
Cavity field ensembles from nonselective measurements
J. Larson, S. Stenholm
We continue our investigations of cavity QED with time dependent parameters. In this paper we discuss the situation where the state of the atoms leaving the cavity is reduced but t…
Photon filters in a microwave cavity
J. Larson, S. Stenholm
In an earlier paper we have concluded that time-dependent parameters in atom-mode interaction can be utilized to modify the quantum field in a cavity. When an atom shoots through t…
Decoherent many-body dynamics of a nano- mechanical resonator coupled to charge qubits
Mahmoud Abdel-Aty, J. Larson, H. Eleuch
The dynamics of charge qubits coupled to a nanomechanical resonator under influence of both a phonon bath in contact with the resonator and irreversible decay of the qubits is cons…
Optimization of transformer ratio and beam loading in a plasma wakefield accelerator with a structure-exploiting algorithm
Q. Su, J. Larson, T. N. Dalichaouch +8
Plasma-based acceleration has emerged as a promising candidate as an accelerator technology for a future linear collider or a next-generation light source. For a linear collider, t…
Adiabatic state preparation in a cavity
J. Larson, S. Stenholm
The paper discusses the single-mode Jaynes-Cummings model with time dependent parameters. Solvable models for two-level systems are utilized to consider the changes in the photon d…
Travelling to exotic places with ultracold atoms
M. Lewenstein, A. Kubasiak, J. Larson +4
We review and speculate on two recent developments of quantum optics and ultracold atoms. First, we discuss a possible realization of "phonon" physics, or as we call it "refracton"…
Magnetic measurements of Fermilab rapid-cycling Booster gradient magnets
J. DiMarco, D. Assell, T. Cummings +8
Fermilab is upgrading its Booster synchrotron to increase ramp rate and intensity. This is part of the Proton Improvement Plan (PIP-II) that will allow the Main Injector to achieve…
Band structure loops and multistability in cavity-QED
B. Prasanna Venkatesh, J. Larson, D. H. J. O'Dell
We calculate the band structure of ultracold atoms located inside a laser-driven optical cavity. For parameters where the atom-cavity system exhibits bistability, the atomic band s…