Effective Jaynes-Cummings model from on-chip filter in a dc SQUID phase qubit

B. K. Cooper; R. P. Budoyo; V. Zaretskey; C. J. Ballard; J. R. Anderson; C. J. Lobb; F. C. Wellstood

doi:10.1117/12.2016272

28 May 2013 Effective Jaynes-Cummings model from on-chip filter in a dc SQUID phase qubit

B. K. Cooper, R. P. Budoyo, V. Zaretskey, C. J. Ballard, J. R. Anderson, C. J. Lobb, F. C. Wellstood

Proceedings Volume 8749, Quantum Information and Computation XI; 87490N (2013) https://doi.org/10.1117/12.2016272
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

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, and 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); https://doi.org/10.1117/12.2016272

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