Hartmut Häffner

TL;DR: HITRAP as discussed by the authors is a planned ion trap facility for capturing and cooling of highly charged ions produced at GSI in the heavy-ion complex of the UNILAC-SIS accelerators and the ESR storage ring.

TL;DR: In this paper, a geometric phase gate of two ion qubits that are encoded in two levels linked by an optical dipole-forbidden transition was proposed, which has many interesting properties, such as very low spontaneous emission rates, applicability to magnetic field insensitive states, and use of a co-propagating laser beam geometry.

TL;DR: In this article, the authors describe a broadly applicable experimental proposal to search for the violation of local Lorentz invariance (LLI) with atomic systems using dynamic decoupling and can be implemented in current atomic clock experiments.

TL;DR: In this article, materials requirements for such integrated systems, with a focus on problems that hinder current progress towards practical quantum computation, are considered, and suggestions for how materials scientists and trapped ion technologists can work together to develop materials-based integration and noise-mitigation strategies to enable the next generation of trapped-ion quantum computers.

TL;DR: The scheme of an ion trap quantum computer is described and the implementation of quantum gate operations with trapped Ca+ ions is discussed, and several recent experiments investigating entanglement of ions are investigated.