Optimization of Junction and Bias Parameters in readout of Phase Qubit

Abstract

The exact numerical solution of the nonlinear Ginzburg-Landau equation for Josephson junctions is obtained, from which the nontrivial current density and effective potential of the Josephson junction are accurately found. Tunneling probabilities of the calculated bound states in the resulting potential well are computed. 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 measurement of states. Particularly, it is predicted that Josephson junctions with thicker barriers yield better performance in measurement of the phase qubit. The proportion of other parameters is also studied and discussed for the right situation of the setup. Results are in complete agreement with reported experimental data.

References in corpus (9)

• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Demonstration of a neutral atom controlled-NOT quantum gate
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• High-fidelity gates in a Josephson qubit
• Optimal control of a leaking qubit
• Quantum dynamics in a camel-back potential of a dc SQUID
• Superconducting phase qubit based on the Josephson oscillator with strong anharmonicity
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Cited by in corpus (2)

• Feynman Path Integral Approach on Superconducting Qubits and Readout Process
• Precise Time Evolution of Superconductive Phase Qubits