Superconducting non-linear resonator for non-destructive readout of a flux qubit

We have investigated microwave response of a λ/4 superconducting coplanar waveguide resonator which is terminated by a DC-SQUID coupled with a flux qubit. The circuit is designed for non-destructive single-shot readout of a flux qubit based on dispersive interaction between the qubit and the resonat...

Full description

Saved in:
Bibliographic Details
Published inJournal of physics. Conference series Vol. 150; no. 5; p. 052077
Main Authors Inomata, K, Watanabe, M, Yamamoto, T, Matsuba, K, Nakamura, Y, Tsai, J S
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.03.2009
Subjects
Circuit design
Coplanar waveguides
Physics
Resonant frequencies
Resonators
Superconducting quantum interference devices
Superconductivity
Online AccessGet full text

Cover

More Information
Summary:We have investigated microwave response of a λ/4 superconducting coplanar waveguide resonator which is terminated by a DC-SQUID coupled with a flux qubit. The circuit is designed for non-destructive single-shot readout of a flux qubit based on dispersive interaction between the qubit and the resonator and switching between bistable states of the driven nonlinear resonator. A high-frequency (∼ 10 GHz) resonator is exploited for suppressing photon-number fluctuations which cause qubit dephasing even when the readout circuit is not activated. We observed bifurcation of the resonator in the nonlinear driving regime. In the linear regime, the degeneracy point of the qubit was detected as a shift of the resonant frequency.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/150/5/052077