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Dewes A, Gaber T, Koelle D, et al. Semifluxon molecule under control. Phys Rev Lett. 2008;101(24):247001doi: 10.1103/PhysRevLett.101.247001.
Dewes, A., Gaber, T., Koelle, D., Kleiner, R., & Goldobin, E. (2008). Semifluxon molecule under control. Physical review letters, 101(24), 247001. https://doi.org/10.1103/PhysRevLett.101.247001
Dewes, Andreas, et al. "Semifluxon molecule under control." Physical review letters vol. 101,24 (2008): 247001. doi: https://doi.org/10.1103/PhysRevLett.101.247001
Dewes A, Gaber T, Koelle D, Kleiner R, Goldobin E. Semifluxon molecule under control. Phys Rev Lett. 2008 Dec 12;101(24):247001. doi: 10.1103/PhysRevLett.101.247001. Epub 2008 Dec 09. PMID: 19113654.
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Phys Rev Lett. 2008 Dec 12;101(24):247001. doi: 10.1103/PhysRevLett.101.247001. Epub 2008 Dec 09.

Semifluxon molecule under control.

Physical review letters

Andreas Dewes, Tobias Gaber, Dieter Koelle, Reinhold Kleiner, Edward Goldobin

Affiliations

  1. Physikalisches Institut & Center for Collective Quantum Phenomena, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany. [email protected]

PMID: 19113654 DOI: 10.1103/PhysRevLett.101.247001

Abstract

Josephson junctions with a phase drop of pi in the ground state allow us to create vortices of supercurrent carrying only half of the magnetic flux quantum Phi0 approximately 2.07 x 10(-15) Wb. Such semifluxons have twofold degenerate ground states denoted upward arrow (with flux +Phi0/2 and supercurrent circulating clockwise) and downward arrow (with flux -Phi0/2 and supercurrent circulating counterclockwise). We investigate a molecule consisting of two coupled semifluxons in a 0-pi-0 long Josephson junction. The fluxes (polarities) of semifluxons are measured by two on-chip SQUIDs. By varying the dc bias current applied to the 0-pi-0 junction, we demonstrate controllable manipulation and switching between two states, upward arrow downward arrow and downward arrow upward arrow, of a semifluxon molecule. These results provide a major step towards employing semifluxons as bits or qubits for classical and quantum digital electronics.

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