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Quantitative study of macroscopic quantum tunneling in a dc SQUID: A system with two degrees of freedom

Li, Shaoxiong
Yu, Yang
Zhang, Yu
Qiu, Wei
Han, Siyuan
Wang, Zhen
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Abstract
To test whether the theory of macroscopic quantum tunneling (MQT) is applicable to systems with 2 degrees of freedom, we experimentally investigated the switching current distribution of a dc SQUID. Using sample parameters determined from measurements at T=4.2 K, we are able to make quantitative comparison to the theories from 8 mK to 4.2 K. The excellent agreement between the data and the MQT theory demonstrates that tunneling from the zero-voltage state of the dc SQUID is well described by the quantum mechanics.
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2002-08
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AMERICAN PHYSICAL SOC
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Li, SX; Yu, Y; Zhang, Y; Qiu, W; Han, S; Wang, Z. Quantitative study of macroscopic quantum tunneling in a dc SQUID: A system with two degrees of freedom. PHYSICAL REVIEW LETTERS. August 2002. 89(9)
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