Interaction-Free Measurements with Superconducting Qubits
G. S. Paraoanu
DOI 10.1103/PhysRevLett.97.180406 · Physical Review Letters
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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.
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