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Superconducting Qubits

Macroscopic quantum tunneling in quartic and sextic potentials: application to a phase qubit

arXiv
Authors: Nicolas Didier, Frank W. J. Hekking

Year

2011

Paper ID

28998

Status

Preprint

Abstract Read

~2 min

Abstract Words

108

Citations

N/A

Abstract

Macroscopic quantum tunneling of the phase is a fundamental phenomenon in the quantum dynamics of superconducting nanocircuits. The tunneling rate can be controlled in such circuits, where the potential landscape for the phase can be tuned with different external bias parameters. Precise theoretical knowledge of the macroscopic quantum tunneling rate is required in order to simulate and understand the experiments. We present a derivation, based on the instanton technique, of an analytical expression of the escape rate in general quartic and symmetric sextic potentials comprising two escape paths. These new potentials were recently realized when creating a noise-insensitive phase qubit in the camel-back potential of a dc SQUID.

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  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
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  • Macroscopic quantum tunneling of the phase is a fundamental phenomenon in the quantum dynamics of superconducting nanocircuits.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1110.6311 [2] arXiv https://arxiv.org/abs/1110.6311 [3] Publisher https://arxiv.org/abs/1110.6311

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