2 citations · 3 across the 4 of their papers we have counts for
5 papers
Cayley Commutator-free Methods for Krotov-Type Algorithms in Quantum Optimal Control
Boris Wembe, Usman Ali, Torsten Meier +1
This paper presents a class of structure-preserving numerical methods for quantum optimal control problems, based on commutator-free Cayley integrators. Starting from the Krotov fr…
Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling
Usman Ali, Martin Holthaus, Torsten Meier
We investigate the dynamics of wave packets in a parabolic optical lattice formed by combining an optical lattice with a global parabolic trap. Our study examines the phase space r…
Floquet dynamics of ultracold atoms in optical lattices with a parametrically modulated trapping potential
Usman Ali, Martin Holthaus, Torsten Meier
Experiments with ultracold atoms in optical lattices usually involve a weak parabolic trapping potential which merely serves to confine the atoms, but otherwise remains negligible.…
Chirped Bloch-Harmonic oscillations in a parametrically forced optical lattice
Usman Ali, Martin Holthaus, Torsten Meier
The acceleration theorem for wavepacket propagation in periodic potentials disentangles the kspace dynamics and real-space dynamics. This is well known and understood for Bloch osc…
Super-Bloch oscillations with parametric modulation of a parabolic trap
Usman Ali, Torsten Meier
Super-Bloch oscillations are the outcome of a relative phase between Bloch oscillations and modulations of the periodic lattice. We analyze the dynamics for a model system in which…