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      Study of junction and bias parameters in readout of phase qubits

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      Author
      Zandi H.
      Safaei, S.
      Khorasani, S.
      Fardmanesh, M.
      Date
      2012
      Source Title
      Physica C: Superconductivity and its Applications
      Print ISSN
      0921-4534
      Volume
      475
      Pages
      60 - 68
      Language
      English
      Type
      Article
      Item Usage Stats
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      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 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
      Permalink
      http://hdl.handle.net/11693/21485
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.physc.2011.05.002
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