Mesoscopic segmented ion traps

Solid state quantum information devices via deterministic implantation

Universal and deterministic implantation of single ions in solids:
Single doped atoms in solids present a promising basis for quantum information processing and the improvement of contemporary microelectronical semiconductor devices. This project aims at creating these structures using a segmented linear Paul trap as a deterministic source of single ions. more...

Optimal control theory of internal and external degrees of freedom  of trapped ions

Quantum computations and simulations in segemented ion traps rely on the ability to perform gate operations with high fidelity. On the one hand, the quantum optical gate operations for single ions or between two ions need to be performed with high precision and error resilience. On the other hand, the transport operations in the trap need to be performed fast while at the same time a minimum amount of energy is to be transferred to the ion. Therefore, optimal control theory is an ideal tool to derive fast and robust laser pulses for gate operations [1] and voltage waveforms for transport sequences [2]. more...

Ultra fast transport of ions in segmented linear traps

Experimental studies of fast ion transport outside adiabatic limits are very important for a future ion trap quantum computer as it will spend approximately 99% of time shuttling ions around. It is therefore crucial to understand and be able to control the process of fast (nonadiabatic) ion transport such that the computationall timescale does not exceed the coherence time of the quantum register. more...

Spectroscopy of rare radioactive Be+ ions in mesoscopie linear segmented Traps

We aim to trap single Beryllium ions 7,9,10,11Be+ in a segmented Paul trap, to sympathetically cool them with calcium ions and to spectroscopically analyze them. 11Be+ is particularly interesting because of being a one neutron halo system. The main feature of such halo cores is that one or more neutrons are located outside the strong interaction, leading to a weak bond of the neutrons. Precision spectroscopy of the isotope shift on the 2S1/2 to 2P1/2 transition in combination with atomic structure calculations will enable a determination of the nuclear charge radius. more...