Beyond coincidence in Hong-Ou-Mandel interferometry

Hamish Scott, Dominic Branford, Niclas Westerberg, Jonathan Leach, Erik M. Gauger

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
109 Downloads (Pure)


The Hong-Ou-Mandel effect provides a mechanism to determine the distinguishability of a photon pair by measuring the bunching rates of two photons interfering at a beam splitter. Of particular interest is the distinguishability in time, which can be used to probe a time delay. Photon detectors themselves give some timing information, however, while that resolution may dwarf that of an interferometric technique, typical analyses reduce the interference to a binary event, neglecting temporal information in the detector. By modeling detectors with number and temporal resolution we demonstrate a greater precision than coincidence rates or temporal data alone afford. Moreover, the additional information can allow simultaneous estimation of a time delay alongside calibration parameters, opening up the possibility of calibration-free protocols and approaching the precision of the quantum Cramér-Rao bound.

Original languageEnglish
Article number033714
JournalPhysical Review A
Issue number3
Publication statusPublished - 10 Sept 2020


  • quant-ph

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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