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.
The dc SQUID qubit can be viewed as a single current biased Josephson junction attached to an inductive isolation network. Excellent broadband isolation is possible and is adjustable in situ. The isolation network increases the effective shunt resistance due to the lead impedance allowing for long energy dissipation times T1. We present data on Rabi oscillations, and macroscopic quantum tunneling as isolation from the bias leads is varied.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.