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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Tunnelling & Josephson Junctions
TT 6.4: Vortrag
Montag, 11. März 2013, 10:15–10:30, H18
Tunable qubit based on a molecule of two fractional Josephson vortices — •Dennis Manuel Heim1, Karl Vogel1, Wolfgang Peter Schleich1, Dieter Koelle2, Reinhold Kleiner2, and Edward Goldobin2 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm, Germany — 2Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, D-72076 Tübingen, Germany
We propose a concept of a qubit based on two coupled fractional vortices pinned at two artificially created κ discontinuities of the Josephson phase in a long Josephson junction. Each discontinuity can be created by a pair of tiny current injectors with the current Iinj applied. We map the dynamics of the system to the dynamics of a single particle in a double-well potential and calculate the effective parameters of this potential. By tuning the discontinuities κ ∝ Iinj during the experiment we are able to control the parameters of the effective double-well potential as well as to initialize the fractional vortex molecule to a desired state. The system can be used to study macroscopic quantum phenomena involving tailored vortex matter.