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.
- Received 19 December 2005
DOI:https://doi.org/10.1103/PhysRevLett.97.180406
©2006 American Physical Society