Quantum optimal control, a toolbox for devising and implementing the shapes of external
fields that accomplish given tasks in the operation of a quantum device in the best way …

Rydberg-atom arrays are a leading platform for quantum computing and simulation,
combining strong interactions with highly coherent operations and flexible geometries …

Coherence time and gate fidelities in Rydberg atom quantum simulators and computers are
fundamentally limited by the Rydberg state lifetime. Circular Rydberg states are highly …

We present a new open-source Python package, krotov, implementing the quantum optimal
control method of that name. It allows to determine time-dependent external fields for a wide …

The precise engineering of quantum states, a basic prerequisite for technologies such as
quantum-enhanced sensing or quantum computing, becomes more challenging with …

Circular Rydberg states are excellent tools for quantum technologies, with large mutual
interactions and long lifetimes in the tens of milliseconds range, 2 orders of magnitude larger …

Superpositions of states with macroscopically different properties, named 'cats' after
Schrödinger's Gedanken experiment, are extraordinarily sensitive probes of their …

We report the optical trapping of multiple ions localized at individual lattice sites of a one-
dimensional optical lattice. We observe a fivefold increased range of axial dc-electric field …

We discuss three proposed schemes of initializing circular-state Rydberg atoms via optical
couplings provided by the ponderomotive effect in contrast to the current circularization …

Entanglement generation can be robust against certain types of noise in approaches that
deliberately incorporate dissipation into the system dynamics. The presence of additional …