Interaction-Free Measurements with Superconducting Qubits
Gheorghe Sorin Paraoanu · Physical Review Letters · 2006
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.