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Quantum nature of a strongly-coupled single quantum dot-cavity system
K. Hennessy, A. Badolato, M. Winger +6
Cavity quantum electrodynamics (QED) studies the interaction between a quantum emitter and a single radiation-field mode. When an atom is in strong coupling with a cavity mode1,2,…
How to realize a universal quantum gate with trapped ions
F. Schmidt-Kaler, H. Häffner, M. Riebe +7
We report the realization of an elementary quantum processor based on a linear crystal of trapped ions. Each ion serves as a quantum bit (qubit) to store the quantum information in…
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…
Experiments towards quantum information with trapped Calcium ions
D. Leibfried, C. Roos, P. Barton +8
Ground state cooling and coherent manipulation of ions in an rf-(Paul) trap is the prerequisite for quantum information experiments with trapped ions. With resolved sideband coolin…
Sympathetic ground state cooling and coherent manipulation with two-ion-crystals
H. Rohde, S. T. Gulde, C. F. Roos +5
We have cooled a two-ion-crystal to the ground state of its collective modes of motion. Laser cooling, more specific resolved sideband cooling is performed sympathetically by illum…
Ground state cooling, quantum state engineering and study of decoherence of ions in Paul traps
F. Schmidt-Kaler, Ch. Roos, H. C. Naegerl +12
We investigate single ions of in Paul traps for quantum information processing. Superpositions of the S electronic ground state and the metastable D sta…