Study of junction and bias parameters in readout of phase qubits

Autor: Hesam Zandi, Mehdi Fardmanesh, Sina Khorasani, Shabnam Safaei
Rok vydání: 2012
Předmět:
Josephson effect
Flux qubit
Josephson junctions
Phase qubit
Quantum information
Effective potentials
Tunneling
Ginzburg-Landau equations
Numerical solution
Bound state
Energy Engineering and Power Technology
Experimental data
Insulating barriers
Pi Josephson junction
Characteristic parameter
Potential wells
Josephson junction
Condensed Matter::Superconductivity
Life-times
Electron tunneling
Electrical and Electronic Engineering
Tunneling probabilities
Quantum tunnelling
Cross sectional area
Physics
Quantum optics
Condensed matter physics
Quantum computers
Josephson junction devices
Biasing
Condensed Matter Physics
Optimal operation
Electronic
Optical and Magnetic Materials
Bias parameters
Perturbation approach
Magnetic fields
Corresponding state
Superconducting tunnel junction
Figures of merits
Superconducting quantum computing
Zdroj: Physica C: Superconductivity and its Applications
ISSN: 0921-4534
DOI: 10.1016/j.physc.2011.05.002
Popis: 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.
Databáze: OpenAIRE
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