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

Natapon Harnchaiwat, Feng Zhu, Niclas Westerberg, Erik Gauger, Jonathan Leach

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)
46 Downloads (Pure)


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 Cramér-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).
Original languageEnglish
Pages (from-to)2210-2220
Number of pages11
JournalOptics Express
Issue number2
Early online date15 Jan 2020
Publication statusPublished - 20 Jan 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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