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Title: Vortex qubit based on an annular Josephson junction containing a microshort
Authors: Price, A.N.
Kemp, A.
Gulevich, Dmitry R.
Kusmartsev, F.V.
Ustinov, A.V.
Keywords: Magnetic-field
Quantum superposition
Issue Date: 2010
Publisher: © American Physical Society
Citation: PRICE, A.N. ... et al, 2010. Vortex qubit based on an annular Josephson junction containing a microshort. Physical Review B, 81 (014506), 12pp.
Abstract: We report theoretical and experimental work on the development of a vortex qubit based on a microshort in an annular Josephson junction. The microshort creates a potential barrier for the vortex, which produces a double-well potential under the application of an in-plane magnetic field; the field strength tunes the barrier height. A one-dimensional model for this system is presented, from which we calculate the vortex-depinning current and attempt frequency as well as the interwell coupling. Implementation of an effective microshort is achieved via a section of insulating barrier that is locally wider in the junction plane. Using a junction with this geometry we demonstrate classical state preparation and readout. The vortex is prepared in a given potential well by sending a series of “shaker” bias-current pulses through the junction. Readout is accomplished by measuring the vortex-depinning current.
Version: Published
DOI: 10.1103/PhysRevB.81.014506
URI: https://dspace.lboro.ac.uk/2134/12761
Publisher Link: http://dx.doi.org/10.1103/PhysRevB.81.014506
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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