Quiet readout of superconducting flux states

John Clarke, T. L. Robertson, B. L.T. 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: Contribution to journalConference articlepeer-review


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)
Pages (from-to)173-177
Number of pages5
JournalPhysica Scripta T
StatePublished - 2002
EventProceedings of the Nobel Jubilee Symposium: Condensation and Coherence in Condensed Matter - Goteborg, Sweden
Duration: Dec 4 2001Dec 7 2001

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics


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