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Heisenberg-scaling measurement of the single-photon Kerr non-linearity using mixed states.
- Source :
- Nature Communications; 1/8/2018, Vol. 9 Issue 1, p1-6, 6p
- Publication Year :
- 2018
-
Abstract
- 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 quantumenhanced scaling of N<superscript>2</superscript>, which in theory allows a better-than-classical scaling in practical measurements. In this work, utilizing mixed states with a large uncertainty and a postselection 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 × 10<superscript>-8</superscript> rad was observed with a precision of ≃3.6 × 10 <superscript>-10</superscript> rad. From the use of mixed states, the upper bound of quantum fisher information is improved to 2N<superscript>2</superscript>. Moreover, by using an imaginary weak-value the scheme is robust to noise originating from the self-phase modulation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 9
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 137986843
- Full Text :
- https://doi.org/10.1038/s41467-017-02487-z