Abstract
Optical phase estimation plays a crucial role in accurate measurements of various physical quantities like length, velocity and displacement. Since a sharp, canonical measurement of the phase is even in principle not realizable, the goal of phase estimation schemes are to achieve the sharpest possible probability distribution. While many demonstrated phase estimation schemes deal with the accurate measurement of a small phase shift around an already known phase (e.g. [1,2]), ab-initio phase estimation deals with the estimation of a completely unknown phase[3-5]. Experimentally this was shown using highly probabilistic and fragile NOON states and without the implementation of real-time feedback control [6].
© 2015 IEEE
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