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Realization of the quantum Toffoli gate with trapped ions
T. Monz, K. Kim, W. Hänsel +6
Algorithms for quantum information processing are usually decomposed into sequences of quantum gate operations, most often realized with single- and two- qubit gates[1]. While such…
'Designer atoms' for quantum metrology
C. F. Roos, M. Chwalla, K. Kim +2
Entanglement is recognized as a key resource for quantum computation and quantum cryptography. For quantum metrology, the use of entangled states has been discussed and demonstrate…
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…