Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 9: Transport: Quantum Coherence and Quantum Information Systems

TT 9.1: Vortrag

Montag, 25. Februar 2008, 14:00–14:15, H 2053

Control of two coupled Josephson persistent current qubits at the degeneracy point — •Marcel Manheller^1,2, Pieter de Groot¹, C. J. P. M. Harmans¹, and J. E. Mooij¹ — ¹TU Delft, Netherlands — ²IFF, FZ, Juelich, Deutschland

A Josephson persistent current qubit is created by a superconducting loop, which is interrupted by three Josephson junctions. A quantum mechanical two level system is generated, if a magnetic field close to half a flux quantum is applied at the qubit loop. Two qubits are coupled inductively, while sharing a piece of line. The two qubits are operated via two control lines, which can produce a gradient in electro-magnetic field over the qubits. Thereby we are able to control a two qubit system at the degeneracy point. At this point is the theoretical lifetime of a qubit a factor of 35 higher then at the usual operation point. This promises us to apply a simple algorithm on this device.