@article{2b68760575d74ff1b38863a53131e1b9,
title = "Advantage of Coherent States in Ring Resonators over Any Quantum Probe Single-Pass Absorption Estimation Strategy",
abstract = "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.",
author = "Alexandre Belsley and Allen, {Euan J.} and Animesh Datta and Matthews, {Jonathan C.F.}",
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. ",
year = "2022",
month = jun,
day = "10",
doi = "10.1103/PhysRevLett.128.230501",
language = "English",
volume = "128",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "23",
}