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

15 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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