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Josephson Vortex Qubit: Design, Preparation and Read‐Out
Author(s) -
Kemp A.,
Wallraff A.,
Ustinov A.V.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200210)233:3<472::aid-pssb472>3.0.co;2-j
Subject(s) - josephson effect , qubit , flux qubit , vortex , phase qubit , physics , condensed matter physics , quantum , perturbation (astronomy) , pi josephson junction , magnetic field , josephson phase , josephson energy , charge qubit , superconductivity , quantum mechanics , mechanics
The design of a qubit based on a single Josephson vortex trapped in a shaped long Josephson junction is discussed in detail. The vortex potential is formed due to its interaction with an in‐plane magnetic field and a bias current applied to the junction. The profile of the potential is calculated using a standard perturbation approach. We examine the dependence of the potential properties on the junction shape and its electrical parameters and discuss the requirements for observing quantum effects in this system. We have developed and experimentally tested methods for the preparation and read‐out of vortex states of this qubit in the classical regime.