Study of junction and bias parameters in readout of phase qubits
Author
Zandi H.
Safaei, S.
Khorasani, S.
Fardmanesh, M.
Date
2012Source Title
Physica C: Superconductivity and its Applications
Print ISSN
0921-4534
Volume
475
Pages
60 - 68
Language
English
Type
ArticleItem Usage Stats
260
views
views
172
downloads
downloads
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.
Keywords
Josephson junctionPhase 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