Kurt Jacobs
U. Mass.
Abstract: Being able to measure nonlinear observables of quantum
systems, such a nano-mechnical resonators, is useful for a number of
reasons. However, to do so one needs to engineer interactions between
the resonator and a probe system that contains only the desired
nonlinear observable. We show how one can, in principle, make
continuous measurements of a wide range of nonlinear observables by
using an auxiliary qubit, coupled to the resonator via a simple fixed
interaction, and performing time-dependent control on the qubit.