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Quantum computing with trapped ions
H. Haeffner, C. F. Roos, R. Blatt
Quantum computers hold the promise to solve certain computational task much more efficiently than classical computers. We review the recent experimental advancements towards a quan…
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…
Generalized spin squeezing inequalities in qubit systems: theory and experiment
J. K. Korbicz, O. Gühne, M. Lewenstein +3
We present detailed derivations, various improvements and application to concrete experimental data of spin squeezing inequalities formulated recently by some of us [Phys. Rev. Let…
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…
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…