  We propose a new method to overcome quantum back-action in a measurement
process using oscillators. An optical oscillator is used as a meter to measure
the parameters of another open oscillator. The optical oscillator is
synthesized such that the optical restoring force counters any perturbations
induced by the quantum back-action phenomena. As a result, it is shown that the
quantum back-action in continuous measurement is suppressed in the low
frequency regime i.e., for frequencies much smaller than the resonance
frequency of the open oscillator. As the meter plays the role of measuring
parameters as well as suppressing the quantum back-action, we call it as
quantum back-action nullifying meter. As an application of this method,
synthesis of quantum back-action nullifying optical oscillator for suppressing
radiation pressure force noise in linear and non-linear optomechanics is
described.
