Interaction-Free Measurements with Superconducting Qubits

G. S. Paraoanu
Phys. Rev. Lett. 97, 180406 – Published 1 November 2006

Abstract

An interaction-free measurement protocol is described for a quantum circuit consisting of a superconducting qubit and a readout Josephson junction. By measuring the state of the qubit, one can ascertain the presence of a current pulse through the circuit at a previous time without any energy exchange between the qubit and the pulse.

  • Figure
  • Figure
  • Received 19 December 2005

DOI:https://doi.org/10.1103/PhysRevLett.97.180406

©2006 American Physical Society

Authors & Affiliations

G. S. Paraoanu*

  • NanoScience Center and Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014 University of Jyväskylä, Finland, and Institute for Quantum Optics and Quantum Information, ICT-Gebäude, Technikerstraße 21a, A-6020 Innsbruck, Austria

  • *Electronic address: paraoanu@phys.jyu.fi

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Vol. 97, Iss. 18 — 3 November 2006

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