High precision metrology from the fisher information of a Hong-Ou-Mandel interferometer

Ashley Lyons, G. Knee, Eliot Bolduc, Thomas Roger, Jonathan Leach, Erik Gauger, Daniele Faccio

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Quantum interference forces two indistinguishable input photons to depart a beamsplitter in the same (of two possible) spatial output modes; this is known as the Hong-Ou-Mandel (HOM) effect. It provides a quantitative way of measuring the distinguishability between two photons and also has been utilised to determine their relative temporal delays [1,2]. HOM interferometry offers numerous advantages over its classical counterpart, most importantly it lacks any dependence on the phase of the photons and therefore can potentially provide reliable measurements in environments where the phase is unstable. To date there have been very few investigations on the precision that is achievable with HOM interferometry. Experiments with collinear geometries have yielded sensitivities as low as 0.1fs however these approaches are limited to measurements of birefringence and other polarisation dependent effects [3,4], as the precision derives from the inherently stable shared path of the photon pairs. Typical non-shared path HOM interferometers exhibit resolution of roughly 1-3 fs (0.3-1 μm).
Original languageEnglish
Title of host publicationEuropean Quantum Electronics Conference 2017
PublisherOSA Publishing
ISBN (Print)9781509067367
Publication statusPublished - 25 Jun 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


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