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Heisenberg-scaling measurement of the single-photon Kerr non-linearity using mixed states
- Source :
- Nature Communications, Vol 9, Iss 1, Pp 1-6 (2018), Nature Communications
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 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 quantum-enhanced scaling of N2, 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 × 10−8 rad was observed with a precision of ≃3.6 × 10−10 rad. From the use of mixed states, the upper bound of quantum fisher information is improved to 2N2. Moreover, by using an imaginary weak-value the scheme is robust to noise originating from the self-phase modulation.<br />Quantum metrology usually relies on entanglement or squeezing for pursuing Heisenberg-limited precision. In this work, instead, the authors demonstrate Heisenberg-scaling measurement of a single photon Kerr’s nonlinearity using less-demanding mixed states.
- Subjects :
- Photon
Science
Phase (waves)
FOS: Physical sciences
Physics::Optics
General Physics and Astronomy
02 engineering and technology
Quantum entanglement
01 natural sciences
Noise (electronics)
Upper and lower bounds
Article
General Biochemistry, Genetics and Molecular Biology
Quantum mechanics
0103 physical sciences
Quantum metrology
lcsh:Science
010306 general physics
Scaling
Physics
Quantum Physics
Multidisciplinary
General Chemistry
021001 nanoscience & nanotechnology
Nonlinear system
lcsh:Q
Quantum Physics (quant-ph)
0210 nano-technology
Physics - Optics
Optics (physics.optics)
Subjects
Details
- ISSN :
- 20411723
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Nature Communications
- Accession number :
- edsair.doi.dedup.....b87eed794f9aa776eeb8b007e6e3a0f8