Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Poster I
Q 21.42: Poster
Tuesday, March 9, 2010, 16:00–19:00, Lichthof
Stabilizing two-qubit interactions by dynamical decoupling — •Holger Frydrych1, Pavel Bazant2, Gernot Alber1, and Igor Jex2 — 1Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt — 2Department of Physics, FJFI CVUT, Prague
Certain tasks of quantum information processing, such as swap operations or more general perfect state transfer, may require particular two-qubit interactions between the qubits involved. In such cases any additional perturbations, even if they affect single qubits only, are harmful and have to be avoided. In this contribution a dynamical decoupling method is presented with which arbitrary one-qubit perturbations of a qubit network can be suppressed without affecting any two-qubit couplings up to third order average Hamiltonian theory. This method applies to arbitrary numbers of qubits and it relies on the existence of appropriate orthogonal arrays with three levels and of strength two. Possibilities of fault-tolerant implementations are discussed.