Resolution in rotation measurements
Barnett, S.M., Zambrini, R.
Journal of Modern Optics 53, 613-625 (2006)
The limiting resolution in optical interferometry is set by the number of photons used, with the functional dependence determined by the state of light that is prepared. We consider the problem of measuring the rotation of a beam of light about an optical axis and show how the limiting resolution depends on the total number of quanta of orbital angular momentum carried by the light beam.