Approaching the quantum limit of precision in absorbance estimation using classical resources

Euan Allen, Javier J Sabines Chesterking, Alex R Mcmillan, Siddarth Koduru Joshi, Peter S Turner, Jonathan C F Matthews

Research output: Contribution to journalArticle (Academic Journal)peer-review

11 Citations (Scopus)
61 Downloads (Pure)


The utility of transmission measurement has made it a target for quantum enhanced measurement strategies.Here we find if the length of an absorbing object is a controllable variable, then, via the Beer-Lambert law,classical strategies can be optimized to reach within 83% of the absolute quantum limit in precision. Our analysisincludes experimental losses, detector noise, and input states with arbitrary photon statistics. We derive optimaloperating conditions for both classical and quantum sources, and observe experimental agreement with theoryusing Fock and thermal states
Original languageEnglish
JournalPhysical Review Research
Publication statusPublished - 12 Aug 2020

Structured keywords

  • Bristol Quantum Information Institute
  • QETLabs
  • Photonics and Quantum

Cite this