Die Position des Massenschwerpunkts eines einzelnen gefangenen Ions wird mit hoher Präzision gemessen und zeitlich verfolgt. Unter Verwendung eines nahezu resonanten Hochfrequenzfeldes der Wellenlänge 2,37 cm und eines statischen Magnetfeldgradienten von 19 T/m wird die räumliche Position des Ions mit…
Reversible computation has been proposed as a future paradigm for energy efficient computation, but so far few implementations have been realized in practice. Quantum circuits, running on quantum computers, are one construct known to be reversible. In this work, we…
We present the experimental implementation of a two-qubit phase gate, using a radio frequency (RF) controlled trapped-ion quantum processor. The RF-driven gate is generated by a pulsed dynamical decoupling sequence applied to the ions‘ carrier transitions only. It allows for…
Shape correspondence is a fundamental computer vision task in which vertices of 2D or 3D bodies are mapped to another. This represents a combinatorial optimization problem that takes a lot of time on classical computers. In the publication Q-Match: New approach…
Temporal correlations in quantum mechanics are the origin of several non-classical phenomena, but they depend on the dimension of the underlying quantumsystem. This allows one to use such correlations for the certification of a minimal Hilbert space dimension. Here we provide a theoretical proposal…
A major obstacle in the way of miniaturisation of ion traps, desired for many aspects of trapped ion quantum information processing, is anomalous heating. This is heating of the ion’s motion via electric field fluctuations of the trap electrodes. These…
A promising scheme for scalable trapped-ion quantum simulators and processors rely on assembling a larger system from smaller modules between which quantum information is exchanged. This exchange can be realized by physical transport of the ions as carriers of quantum…
Laser cooling is a well-established technique in which the random motion or the temperature of neutral or charged atoms and molecules is reduced by dissipative optical radiation forces. Doppler cooling and sideband cooling methods are routinely used to cool these…
In collaboration with the University of Innsbruck (Austria), IQOQI Vienna (Austria) and the Max-Planck-Institute for Quantum Optics in Munich, we realized a proof-of-principle experiment that combines novel concepts from artificial intelligence with the potential of ion trap quantum computers.In the…
Novel ion traps that employ magnetic gradient fields allow for the application of conditional quantum logic, the essential prerequisite for quantum computing, by the use of radio-frequency radiation that can be generated by off-the-shelf electronics. We show that the Hamiltonian…