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Heisenberg-scaling measurement of the single-photon Kerr non-linearity using mixed states
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Number of Authors: 112018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 93Article in journal (Refereed) Published
Abstract [en]

Improving the precision of measurements is a significant scientific challenge. Previous works suggest that in a photon-coupling scenario the quantum fisher information shows a quantum-enhanced scaling of N-2, which in theory allows a better-than-classical scaling in practical measurements. In this work, utilizing mixed states with a large uncertainty and a post-selection of an additional pure system, we present a scheme to extract this amount of quantum fisher information and experimentally attain a practical Heisenberg scaling. We performed a measurement of a single-photon's Kerr non-linearity with a Heisenberg scaling, where an ultra-small Kerr phase of. 6 x 10(-8) rad was observed with a precision of similar or equal to 3.6 x 10(-10) rad. From the use of mixed states, the upper bound of quantum fisher information is improved to 2N(2). Moreover, by using an imaginary weak-value the scheme is robust to noise originating from the self-phase modulation.

Place, publisher, year, edition, pages
2018. Vol. 9, article id 93
Keywords [en]
Quantum metrology, Quantum optics
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Other Natural Sciences
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URN: urn:nbn:se:su:diva-152550DOI: 10.1038/s41467-017-02487-zISI: 000419446600021PubMedID: 29311543OAI: oai:DiVA.org:su-152550DiVA, id: diva2:1183883
Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved

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Kedem, Yaron
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