Quiet readout of superconducting flux states

John Clarke, T. L. Robertson, Britton Plourde, A. García-Martinez, P. A. Reichardt, D. J. Van Harlingen, B. Chesca, R. Kleiner, Y. Makhlin, G. Schön, A. Shnirman, F. K. Wilhelm

Research output: Chapter in Book/Report/Conference proceedingConference contribution

23 Citations (Scopus)

Abstract

The INSQUID (INductive Superconducting QUantum Interference Device) can measure the flux state of a superconducting qubit rapidly, while allowing the quantum state of the qubit to evolve with low levels of back action. The INSQUID consists of a dc SQUID with unshunted junctions connected in parallel with a superconducting inductor; the qubit is placed inside the SQUID loop. The inductor is coupled to a readout dc SQUID with resistively-shunted junctions. By applying appropriate fluxes to the input SQUID and the inductor, the INSQUID can be turned "off", so that virtually no flux noise is coupled from the readout SQUID to the qubit. Different flux biases turn the INSQUID "on", enabling the readout SQUID to measure the flux state of the qubit. The INSQUID can also be used to turn on and off the coupling between two or more qubits.

Original languageEnglish (US)
Title of host publicationPhysica Scripta T
EditorsT. Claeson, P. Delsing
Pages173-177
Number of pages5
Volume102
StatePublished - 2002
EventProceedings of the Nobel Jubilee Symposium: Condensation and Coherence in Condensed Matter - Goteborg, Sweden
Duration: Dec 4 2001Dec 7 2001

Other

OtherProceedings of the Nobel Jubilee Symposium: Condensation and Coherence in Condensed Matter
CountrySweden
CityGoteborg
Period12/4/0112/7/01

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Clarke, J., Robertson, T. L., Plourde, B., García-Martinez, A., Reichardt, P. A., Van Harlingen, D. J., ... Wilhelm, F. K. (2002). Quiet readout of superconducting flux states. In T. Claeson, & P. Delsing (Eds.), Physica Scripta T (Vol. 102, pp. 173-177)

Quiet readout of superconducting flux states. / Clarke, John; Robertson, T. L.; Plourde, Britton; García-Martinez, A.; Reichardt, P. A.; Van Harlingen, D. J.; Chesca, B.; Kleiner, R.; Makhlin, Y.; Schön, G.; Shnirman, A.; Wilhelm, F. K.

Physica Scripta T. ed. / T. Claeson; P. Delsing. Vol. 102 2002. p. 173-177.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Clarke, J, Robertson, TL, Plourde, B, García-Martinez, A, Reichardt, PA, Van Harlingen, DJ, Chesca, B, Kleiner, R, Makhlin, Y, Schön, G, Shnirman, A & Wilhelm, FK 2002, Quiet readout of superconducting flux states. in T Claeson & P Delsing (eds), Physica Scripta T. vol. 102, pp. 173-177, Proceedings of the Nobel Jubilee Symposium: Condensation and Coherence in Condensed Matter, Goteborg, Sweden, 12/4/01.
Clarke J, Robertson TL, Plourde B, García-Martinez A, Reichardt PA, Van Harlingen DJ et al. Quiet readout of superconducting flux states. In Claeson T, Delsing P, editors, Physica Scripta T. Vol. 102. 2002. p. 173-177
Clarke, John ; Robertson, T. L. ; Plourde, Britton ; García-Martinez, A. ; Reichardt, P. A. ; Van Harlingen, D. J. ; Chesca, B. ; Kleiner, R. ; Makhlin, Y. ; Schön, G. ; Shnirman, A. ; Wilhelm, F. K. / Quiet readout of superconducting flux states. Physica Scripta T. editor / T. Claeson ; P. Delsing. Vol. 102 2002. pp. 173-177
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