Unitary Evolution and Quantum Fluctuation in SQUID |
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| Authors: | SHAO Bin ZOU Jian LI QianShu |
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| Affiliation: | 1. Department Applied Physics, Beijing Institute of Technology, Beijing 100081, China;2. School of Chemical Engineering and Material Sciences, Beijing Institute of Technology, Beijing 100081, China;3. National Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, China |
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| Abstract: | bstractA circular superconductor with a weak-link junction is considered in the presence of a dc voltage bias. Using a time-dependent perturbed method, we obtain a unitary evolution operator of the driven SQUID system. We investigate the step structure of the screening current in the system and show that, due to the Josephson nonlinear term, the Aux and charge can exhibit reduced quantum fluctuation behavior. |
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| Keywords: | SQUID quantum fluctuation squeezing |
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