Generalized partial measurements
Low Temperature Laboratory, Aalto University - P. O. Box 15100, FI-00076 AALTO, Finland, EU
Accepted: 22 February 2011
We introduce a type of measurements which generalize the so-called “partial measurements” performed in recent years with phase qubits. While in the case of partial measurements it has been demonstrated that one could undo the effect of the measurement only for non-switching events, we show here that generalized partial measurements can be reversed probabilistically for both switching and non-switching events. We calculate the associated Fisher information and discuss the estimation sensitivity for quantum tomography. Two ways of implementing this type of measurements with superconducting qubits are proposed.
PACS: 42.50.Dv – Quantum state engineering and measurements / 03.67.-a – Quantum information / 85.25.Cp – Josephson devices
© EPLA, 2011