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…
The realization of a quantum computer requires interdisciplinary efforts in the field of basic research and engineering. That is why we organize a workshop in cooperation with Dr. Ing. Degenhardt from Forschungszentrum Jülich in the period from 23.04.19 to 26.04.19…
The CEO of the IT security company secunet AG, Rainer Baumgart, visited our group for the recent issue of their customer magazine “secuview”. Together with Prof. Christof Wunderlich (Siegen) and Prof. Dieter Meschede (Bonn) he discussed current developments and the…
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…
On May 1st 2017 started the first pilot project Optische Einzelionenuhr für Anwender (optIclock) (user-operable optical single ion clock) in the QUTEGA initiative of Germany’s Federal Ministry of Education and Research (BMBF). With a network of scientific researchers from Physikalisch-Technischen Bundesanstalt Braunschweig,…
A large scale quantum computer is best constructed using a modular approach. Joining with researchers from the University of Sussex (UK), Google (USA), Aarhus University (Denmark) and RIKEN (Japan), we present the blueprint for an ion trap based scalable quantum…