6533b834fe1ef96bd129e321

RESEARCH PRODUCT

Interaction-free measurements with superconducting qubits

Gheorghe Sorin Paraoanu

subject

Josephson effectPhysicsFlux qubitQuantum PhysicsCharge qubitCondensed Matter - SuperconductivityGeneral Physics and AstronomyFOS: Physical sciencesQuantum PhysicsPhase qubitPi Josephson junctionSuperconductivity (cond-mat.supr-con)Computer Science::Emerging TechnologiesQuantum mechanicsQubitCondensed Matter::SuperconductivitySuperconducting tunnel junctionSuperconducting quantum computingQuantum Physics (quant-ph)

description

An interaction-free measurement protocol is described for a quantum circuit consisting of a superconducting qubit and a read-out 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.

10.1103/physrevlett.97.180406http://arxiv.org/abs/0804.0523