Osnabrück 2002 – scientific programme

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Q: Quantenoptik

Q 113: Quantum Computing

Q 113.5: Talk

Monday, March 4, 2002, 15:00–15:15, HS 11/215

Paradox-based quantum gates with cold trapped ions — •Almut Beige, Wolfgang Lange, and Herbert Walther — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany

Two-qubit gates based on an environment-induced quantum Zeno effect are discussed. Each qubit is formed by two ground states of an ion stored inside a linear trap as part of an ion chain. First, all ions are cooled into the vibrational ground state and additional laser fields are applied. Then a weak laser pulse suffices to perform a CNOT gate with a very high fidelity. If the operation fails, photons are emitted at a high rate. This can easily be detected and the computation can be restarted.