Model of magnetic impurities within the Josephson junction of a phase qubita
David P. Pappas, R. P. Erickson
We consider a superconducting phase qubit consisting of a monocrystalline sapphire Josephson junction with symmetry axis perpendicular to the junction interfaces. Via the London gauge we present a theoretical model of Fe3+ magnetic impurities within the junction that describes the effect of a low concentration of impurities on the operation of a superconducting phase qubit. Specifically, we derive an interaction Hamiltonian expressed in terms of angular momentum states of the magnetic impurities and low-lying oscillator states of the qubit. We comment on the coherent coupling between qubit and magnetic impurities within the model, including the near-resonance behavior of qubit and Fe3+ electron states. 85.25.Dq,
Physical Review B (Condensed Matter and Materials Physics)
and Erickson, R.
Model of magnetic impurities within the Josephson junction of a phase qubita, Physical Review B (Condensed Matter and Materials Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902285
(Accessed December 8, 2023)