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Broken Gauge Symmetry in Macroscopic Quantum Circuits

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Abstract

In this paper, we discuss the macroscopic quantum behavior of simple superconducting circuits. Starting from a Lagrangian for electromagnetic field with broken gauge symmetry, we construct a quantum circuit model for a superconducting weak link (SQUID) ring, together with the appropriate canonical commutation relations. We demonstrate that this model can be used to describe macroscopic excitations of the superconducting condensate and the localized charge states found in some ultrasmall-capacitance weak-link devices.

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Authors
  1. J. F. Ralph
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  2. T. D. Clark
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  3. R. J. Prance
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  4. H. Prance
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  5. J. Diggins
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Ralph, J.F., Clark, T.D., Prance, R.J. et al. Broken Gauge Symmetry in Macroscopic Quantum Circuits. Foundations of Physics 28, 485–503 (1998). https://doi.org/10.1023/A:1018772229718

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