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Tracking the polarisation state of light via Hong-Ou-Mandel interferometry

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arxiv 1912.12087 v1 pith:BDU7XXNM submitted 2019-12-27 quant-ph

Natapon Harnchaiwat , Feng Zhu , Niclas Westerberg , Erik Gauger , Jonathan Leach This is my paper
classification quant-ph
keywords polarisationstatechangeshong-ou-mandellightaccurateachievedapplied
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We provide a statistically robust and accurate framework to measure and track the polarisation state of light employing Hong-Ou-Mandel interference. This is achieved by combining the concepts of maximum likelihood estimation and Fisher information applied to photon detection events. Such an approach ensures that the Cram\'er-Rao bound is saturated and changes to the polarisation state are established in an optimal manner. Using this method, we show that changes in the linear polarisation state can be measured with 0.6 arcminute precision (0.01 degrees).

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