success of quantum-enhanced sensors relies on
precise control of the experimental systems to
protect them from undesired sources of noise.
Unfortunately, simple application of known
strategies to reduce decoherence does not
necessarily translate into an improvement of
phase measurements: techniques - such as dynamical
decoupling - that
eliminate decoherence also eliminate the very
signal that one wishes to measure.
this talk I will show how to extend control
techniques to quantum metrology tasks,
achieving a better and more flexible
compromise between sensitivity and noise
protection. In addition, tailoring the sensor
dynamic can help reveal temporal and spatial
information about the target.
can for example use coherent control of
quantum sensors to simultaneously reconstruct
the arbitrary profile of time-varying fields
and correct for unwanted noise sources; or we
can achieve high frequency resolution, thus
allowing precise spectroscopy.
will illustrate applications of these
strategies in experimental implementations
based on the Nitrogen-Vacancy center in