Advantage of Coherent States in Ring Resonators over Any Quantum Probe Single-Pass Absorption Estimation Strategy

Alexandre Belsley, Euan J. Allen, Animesh Datta, Jonathan C.F. Matthews

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Quantum states of light have been shown to enhance precision in absorption estimation over classical strategies. By exploiting interference and resonant enhancement effects, we show that coherent-state probes in all-pass ring resonators can outperform any quantum probe single-pass strategy even when normalized by the mean input photon number. We also find that under optimal conditions coherent-state probes equal the performance of arbitrarily bright pure single-mode squeezed probes in all-pass ring resonators.

Original languageEnglish
Article number230501
JournalPhysical Review Letters
Issue number23
Publication statusPublished - 6 Jun 2022

Bibliographical note

Funding Information:
We thank Krishna C. Balram, Patrick M. Birchall, Osian Wolley, and Gabriel R. Higgins for helpful discussions. A. B. acknowledges support from the EPSRC Grant No. EP/S023607/1. E. J. A. acknowledges support from an EPSRC doctoral prize from EP/R513179/1 and the Royal Academy of Engineering under the Research Fellowship scheme. J. C. F. M. acknowledges support from the EPSRC UK Quantum Technology Hub in Quantum Enhanced Imaging (QuantIC) EP/T00097X/1. A. B. and J. C. F. M. acknowledge support from the ERC starting Grant No. ERC-2018-STG 803665. All data needed to evaluate the conclusions of the paper are present in the main text and the Supplementary Information.

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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