Adaptive phase estimation is more accurate than non-adaptive phase estimation for continuous beams of light

Details Adaptive phase estimation is more accurate than non-adaptive phase estimation for continuous beams of light Adaptive phase estimation is more accurate than non-adaptive phase estimation for continuous beams of light

2004-05-13

arxiv.org/abs/quant-ph/0405066v1

Physics

Quantum Physics

15 pages, 9 figures, submitted to PRA

Scientific paper

10.1103/PhysRevA.70.043812

We consider the task of estimating the randomly fluctuating phase of a continuous-wave beam of light. Using the theory of quantum parameter estimation, we show that this can be done more accurately when feedback is used (adaptive phase estimation) than by any scheme not involving feedback (non-adaptive phase estimation) in which the beam is measured as it arrives at the detector. Such schemes not involving feedback include all those based on heterodyne detection or instantaneous canonical phase measurements. We also demonstrate that the superior accuracy adaptive phase estimation is present in a regime conducive to observing it experimentally.

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