Linear optical quantum metrology with single photons: experimental errors, resource counting, and quantum Cramér-Rao bounds

Jonathan P. Olson*, Keith R. Motes, Patrick M. Birchall, Nick M. Studer, Margarite Laborde, Todd Moulder, Peter P. Rohde, Jonathan P. Dowling

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    Quantum number-path entanglement is a resource for supersensitive quantum metrology and in particular provides for sub-shot-noise or even Heisenberg-limited sensitivity. However, such number-path entanglement is thought to have been resource intensive to create in the first place, typically requiring either very strong nonlinearities or nondeterministic preparation schemes with feedforward, which are difficult to implement. Recently [K. R. Motes, Phys. Rev. Lett. 114, 170802 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.170802], it was shown that number-path entanglement from a BosonSampling inspired interferometer can be used to beat the shot-noise limit. In this paper we compare and contrast different interferometric schemes, discuss resource counting, calculate exact quantum Cramér-Rao bounds, and study details of experimental errors.

    Original languageEnglish
    Article number013810
    Pages (from-to)1-10
    Number of pages10
    JournalPhysical Review A
    Volume96
    Issue number1
    DOIs
    Publication statusPublished - 10 Jul 2017

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