Johanning, M., Braun, A., Timoney, N., Elman, V., Neuhauser, W., Wunderlich, Chr.
We demonstrate for the first time two essential experimental steps towards realizing a novel concept for implementing quantum computing, quantum simulations and creating large entangled states of...
Resonance enhanced isotope-selective photoionization of YbI for ion trap loading (2007)
Braun, A., Paape, Chr., Balzer, Chr., Neuhauser, W., Wunderlich, Chr.
Neutral Ytterbium (YbI) and singly ionized Ytterbium (YbII) is widely used in experiments in quantum optics, metrology and quantum information science. We report on the investigation of isotope...
Error-resistant Single Qubit Gates with Trapped Ions (2006)
Timoney, N., Elman, V., Neuhauser, W., Wunderlich, Chr.
Coherent operations constitutive for the implementation of single and multi-qubit quantum gates with trapped ions are demonstrated that are robust against variations in experimental parameters and...
Electrodynamically trapped Yb+ ions for quantum information processing (2006)
Balzer, Chr., Braun, A., Hannemann, T., Paape, Chr., Ettler, M., Neuhauser, W., ...
Highly efficient, nearly deterministic, and isotope selective generation of Yb$^+$ ions by 1- and 2-color photoionization is demonstrated. State preparation and state selective detection of hyperfine...
A relaxationless demonstration of the Quantum Zeno Paradox on an individual atom (2004)
Balzer, Chr., Hannemann, Th., Rei\ss, D., Wunderlich, Chr., Neuhauser, W., Toschek, P. E.
The driven evolution of the spin of an individual atomic ion on the ground-state hyperfine resonance is impeded by the observation of the ion in one of the pertaining eigenstates. Detection of...
Estimation of qubit states in a factorizing basis (2001)
Hannemann, Th., Reiss, D., Balzer, Ch., Neuhauser, W., Toschek, P. E., Wunderlich, Ch.
The optimal estimation of a quantum mechanical 2-state system (qubit) - with N identically prepared qubits available - is obtained by measuring all qubits simultaneously in an entangled basis. We...
From Spectral Relaxation to Quantified Decoherence (2001)
Balzer, Chr., Hannemann, Th., Rei\ss, D., Neuhauser, W., Toschek, P. E., Wunderlich, Chr.
Quantum information processing (QIP) requires thorough assessment of decoherence. Atoms or ions prepared for QIP often become addressed by radiation within schemes of alternating microwave-optical...
The Quantum Zeno Effect - Evolution of an Atom Impeded by Measurement (2001)
Balzer, Chr., Huesmann, R., Neuhauser, W., Toschek, P. E.
The evolution of a quantum system is supposed to be impeded by measurement of an involved observable. This effect has been proven indistinguishable from the effect of dephasing the system's wave...
Raman cooling and heating of two trapped Ba+ ions (2001)
Reiss, D., Abich, K., Neuhauser, W., Wunderlich, Ch., Toschek, P. E.
We study cooling of the collective vibrational motion of two 138Ba+ ions confined in an electrodynamic trap and irradiated with laser light close to the resonances S_1/2-P_1/2 (493 nm) and...
Neuhauser, W, Haltrich, D, Kulbe, K D, Nidetzky, B
During growth on d-xylose the yeast Candida tenuis produces one aldose reductase that is active with both NADPH and NADH as coenzyme. This enzyme has been isolated by dye ligand and anion-exchange...
Neuhauser, W, Haltrich, D, Kulbe, K D, Nidetzky, B
During growth on d-xylose the yeast Candida tenuis produces one aldose reductase that is active with both NADPH and NADH as coenzyme. This enzyme has been isolated by dye ligand and anion-exchange...