28 May 2013 Effective Jaynes-Cummings model from on-chip filter in a dc SQUID phase qubit
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Abstract
We examine a dc SQUID phase qubit with an on-chip low-pass resonant LC filter that transforms the line impedance, improving the qubit lifetime. Unusual features in the spectroscopy suggest dynamics more complicated than a simple two-level system. To model this behavior, we consider a lumped-element circuit model of the SQUID that includes the filter as part of the quantum system to be modeled. We show this model reduces to an effective Jaynes-Cummings Hamiltonian, in analogy with circuit QED.
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B. K. Cooper, R. P. Budoyo, V. Zaretskey, C. J. Ballard, J. R. Anderson, C. J. Lobb, F. C. Wellstood, "Effective Jaynes-Cummings model from on-chip filter in a dc SQUID phase qubit", Proc. SPIE 8749, Quantum Information and Computation XI, 87490N (28 May 2013); doi: 10.1117/12.2016272; https://doi.org/10.1117/12.2016272
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