Thermal escape and macroscopic quantum tunneling from metastable state in three-junction flux qubit

Abstract

Abstract:

With Kramers theory and Wentzel-Kramers-Brillouin (WKB) approximation theory, this research investigates the thermal escape and macroscopic quantum tunneling behavior of the metastable state in a three-junction flux qubit. At temperature ranging from 0.01k to 4.2k, the escape rate is calculated, the switching distribution which varies with magnetic field and temperature is worked out and the case of superconducting interferometer is also compared quantitatively. The results show that self-noise of three-junction flux qubit is bigger than that of superconducting interferometer.

Key words: quantum information, flux qubit, metastable state, Josephson junction

CLC Number:

O413.1
O511

Shi Qiang, Yan Kezhu, Wang Xiaoli, Liu Zhiquan. Thermal escape and macroscopic quantum tunneling from metastable state in three-junction flux qubit[J]. J4, 2012, 29(6): 723-728.

References

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Thermal escape and macroscopic quantum tunneling from metastable state in three-junction flux qubit

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