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Physical Review Applied

Publisher’s Note: Sub-Shot-Noise Transmission Measurement Enabled by Active Feed-Forward of Heralded Single Photons [Phys. Rev. Applied 8 , 014016 (2017)]

Javier Sabines-Chesterking, Rebecca Whittaker, Siddarth Koduru Joshi, Patrick M. Birchall, Paul‐Antoine Moreau, A. McMillan, Hugo V. Cable, Jeremy L. O’Brien, John Rarity, Jonathan C. F. Matthews

Published Oct 13, 2017• 1 citation
Publisher

Abstract

Received 5 October 2017DOI:https://doi.org/10.1103/PhysRevApplied.8.049902Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasOptical quantum information processingPhotonicsQuantum fluctuations & noiseQuantum measurementsQuantum metrologyQuantum opticsSingle photon sourcesAtomic, Molecular & Optical

DOI
10.1103/physrevapplied.8.049902

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Received 5 October 2017DOI:https://doi.org/10.1103/PhysRevA.96.049903Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.©2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum computationQuantum formalismQuantum information processingQuantum measurementsQuantum metrologyQuantum theoryQuantum tomographyTechniquesPhase space methodsQuantum InformationAtomic, Molecular & OpticalStatistical PhysicsGeneral Physics
The limit of precision in optical measurements is due to quantum fluctuations, which are governed by Poissonian statistics. With a clever setup, however, the authors achieve a precision in transmission measurements that beats this limit, without the selective analysis of recorded data (post-selection). This shows that the single-photon-detector approach, used by many groups worldwide, is viable for real-world optical quantum metrology, not just proof-of-principle tests. In turn, this demonstration unlocks an array of techniques for quantum-state engineering that crucially depend on single-photon detection.
Received 19 January 2017DOI:https://doi.org/10.1103/PhysRevPhysEducRes.13.019901Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAssessmentInstructional materials developmentInstructional strategiesPhysics Education Research
Sub-shot-noise performance in transmission measurements can be achieved in optical quantum metrology owing to significantly lower uncertainty in light intensity of quantum beams compared to their classical counterparts. In this work, we simulate the outcome of an experiment that uses a multiplexed single-photon source, considering several types of experimental losses, where we show that the sub-Poissonian statistics of the output is key for achieving sub-shot-noise performance. We compare the numerical results with the shot-noise limit attained using coherent sources and the quantum limit, obtained with an ideal photon-number Fock state. We also investigate conditions in which threshold detectors can be used, as well as the effect of input light fluctuations. Our results show that sub-shot-noise performance can be achieved with improvement factors ranging from 1.5 to 2, even without using number-resolving detectors.