Publications (15)
Coherence of qubits based on single Ca ions
F. Schmidt-Kaler, S. Gulde, M. Riebe +7
Two-level ionic systems, where quantum information is encoded in long lived states (qubits), are discussed extensively for quantum information processing. We present a collection o…
Scalable multi-particle entanglement of trapped ions
H. Haeffner, W. Haensel, C. F. Roos +11
Among the various kinds of entangled states, the 'W state' plays an important role as its entanglement is maximally persistent and robust even under particle loss. Such states are…
Robust entanglement
H. Haeffner, F. Schmidt-Kaler, W. Haensel +8
It is common belief among physicists that entangled states of quantum systems loose their coherence rather quickly. The reason is that any interaction with the environment which di…
Photoluminescence of Femtosecond Laser-irradiated Silicon Carbide
Y. Abdedou, A. Fuchs, P. Fuchs +8
Silicon carbide (SiC) is the leading wide-bandgap semiconductor material, providing mature doping and device fabrication. Additionally, SiC hosts a multitude of optically active po…
Precision measurement and compensation of optical Stark shifts for an ion-trap quantum processor
H. Haeffner, S. Gulde, M. Riebe +5
Using optical Ramsey interferometry, we precisely measure the laser-induced AC-stark shift on the -- "quantum bit" transition near 729 nm in a single trapped $^…
Coupling a single atomic quantum bit to a high finesse optical cavity
A. B. Mundt, A. Kreuter, C. Becher +4
The quadrupole S -- D optical transition of a single trapped Ca ion, well suited for encoding a quantum bit of information, is coherently coupled to the standin…