Most Recent Preprints
Motional state analysis of a trapped ion by ultra-narrowband composite pulses
arXiv:2402.10041
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In this work, we present a method for measuring the motional state of a two-level system coupled to
a harmonic oscillator. Our technique uses ultra-narrowband composite pulses on the blue sideband
transition to scan through the populations of the different motional states. Our approach does
not assume any previous knowledge of the motional state distribution and is easily implemented.
It is applicable both inside and outside of the Lamb-Dicke regime. For higher phonon numbers
especially, the composite pulse sequence can be used as a filter for measuring phonon number
ranges. We demonstrate this measurement technique using a single trapped ion and show good
detection results with the numerically evaluated pulse sequence.
Hamilton-Jacobi-Bellman equations for Rydberg-blockade processes
arXiv:2402.12956
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More Preprints
We discuss time-optimal control problems for two setups involving globally driven Rydberg atoms in the blockade limit by deriving the associated Hamilton-Jacobi-Bellman equations. From these equations, we extract the globally optimal trajectories and the corresponding controls for several target processes of the atomic system, using a generalized method of characteristics. We apply this method to retrieve known results for CZ and C-phase gates, and to find new optimal pulses for all elementary processes involved in the universal quantum computation scheme introduced in [Physical Review Letters 131, 170601 (2023)].
All Publications
Research Groups
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The research group led by Rainer Blatt investigates quantum processes in a system of few ions held in ion traps. The experiments aim at achieving complete control over all quantum degrees of freedom in...
Quantum Optics and Spectroscopy -
The research team led by Francesca Ferlaino focuses on the study of dipolar quantum phenomena, using strongly magnetic atomic species. In 2012, the group has created the first Bose-Einstein...
Dipolar Quantum Gases -
The research group led by R. GRIMM investigates ultracold particle systems consisting of optically trapped quantum gases at temperatures close to absolute zero. Because of their superb experimental...
Ultracold Atoms and Quantum Gases -
Gerhard Kirchmair’s research group works on superconducting circuits and their application for quantum computation and simulation. Superconducting Josephson junctions are used to realize the quantum...
Superconducting quantum circuits -
The research group led by Hannes Pichler studies quantum optical systems, quantum many-body physics and quantum information. The group aims at laying the theoretical foundations for next generation...
Many-Body Quantum Optics -
The research group led by Oriol Romero-Isart studies topics in the fields of theoretical quantum optics and quantum nanophysics in the context of quantum science and technology. One of the main...
Quantum Nanophysics, Optics and Information -
Wittgenstein awardee Peter Zoller’s research group studies topics in the fields of theoretical quantum optics and atomic physics as well as quantum information and condensed matter theory. The...
Quantum Optics