Resonance eigenstates of the SQUID-qubit system

Details Resonance eigenstates of the SQUID-qubit system Resonance eigenstates of the SQUID-qubit system

2006-06-14

arxiv.org/abs/cond-mat/0606381v1

Physics

Condensed Matter

Superconductivity

REVTeX4, 15pp.; work-in-progress, interim write-up. N.B.: "Alec" is my first, and "Maassen van den Brink" my family name

Scientific paper

We study the complex-valued resonance spectrum of a dc-SQUID coupled to a flux qubit, where the former is treated in the cubic and the latter in the two-level approximation. It is shown that this spectrum is well-defined and contains most of the relevant information on the escape process. Thus, the language of resonance states is precise and well-adapted to switching- (or trigger-) type qubit readout, and a worthwhile complement to the various descriptions of continuous qubit measurement. Initial progress is analytic, but nonperturbative numerical methods have been formulated and should soon yield accurate results for all parameter values.

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