Study of junction and bias parameters in readout of phase qubits

Date
2012
Authors
Zandi H.
Safaei, S.
Khorasani, S.
Fardmanesh, M.
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Physica C: Superconductivity and its Applications
Print ISSN
0921-4534
Electronic ISSN
Publisher
Volume
475
Issue
Pages
60 - 68
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Series
Abstract

The exact numerical solution of the nonlinear Ginzburg-Landau equation for Josephson junctions is obtained, from which the precise nontrivial current density and effective potential of the Josephson junctions are found. Based on the resulting potential well, the tunneling probabilities of the associated bound states are computed which are in complete agreement with the reported experimental data. The effects of junction and bias parameters such as thickness of the insulating barrier, cross sectional area, bias current, and magnetic field are fully investigated using a successive perturbation approach. We define and compute figures of merit for achieving optimal operation of phase qubits and measurements of the corresponding states. Particularly, it is found that Josephson junctions with thicker barriers yield better performance in measurements of phase qubits. The variations of characteristic parameters such as life time of the states due to the above considered parameters are also studied and discussed to obtain the appropriate configuration setup.

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Keywords
Josephson junction, Phase qubit, Quantum information, Tunneling, Bias parameters, Bound state, Characteristic parameter, Corresponding state, Cross sectional area, Effective potentials, Experimental data, Figures of merits, Ginzburg-Landau equations, Insulating barriers, Josephson junctions, Life-times, Numerical solution, Optimal operation, Perturbation approach, Phase qubit, Potential wells, Quantum Information, Tunneling probabilities, Electron tunneling, Josephson junction devices, Magnetic fields, Quantum computers, Quantum optics
Citation
Published Version (Please cite this version)