Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 8: Posters Transport

TT 8.39: Poster

Friday, March 4, 2005, 14:00–18:00, Poster TU C

Bi- and tripartite entanglement in a flux-qubit triangle — •Johannes Ferber and Frank Wilhelm — LMU München, Department für Physik, and CeNS

We are investigating a system of three superconducting flux qubits, inductively coupled by a surrounding loop or via shared lines.

We derive the possible coupling strength between the qubits and determine the energy level structure. We show, that for a proper and physical choice of parameters, the system shows strong three-qubit entanglement, quantified by the 3-tangle of the system [1].

Systems consisting of three qubits provide the possibility of examining quantum nonlocality using GHZ-states in a potentially more convenient way than the two-qubit Bell inequality. Based on our results, we discuss the feasibility of such a GHZ-experiment using flux qubits. Moreover, we outline applications of three-bit interactions to the acceleration of quantum algorithms.

[1] V. Coffmann, J. Kundu, and W. K. Wooters, Phys. Rev. A 61, 052306 (2000).