Interaction-free measurements with superconducting qubits.

  title={Interaction-free measurements with superconducting qubits.},
  author={Georghe S. Paraoanu},
  journal={Physical review letters},
  volume={97 18},
  • G. S. Paraoanu
  • Published 1 November 2006
  • Physics, Medicine
  • Physical review letters
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. 

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