Journal
NEW JOURNAL OF PHYSICS
Volume 19, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aa5512
Keywords
quantum metrology; absorption spectroscopy; sub-Poissonian photon statistics; ultimate quantum limit
Categories
Funding
- DSTL
- EPSRC
- ERC
- Wilkinson Foundation
- Wolfson Merit Award
- EPSRC Early Career Fellowship
- Engineering and Physical Sciences Research Council [EP/J017175/1, EP/I035935/1, EP/K021931/1, EP/M024385/1, 1225845, EP/M01326X/1, EP/L024020/1] Funding Source: researchfish
- EPSRC [EP/L024020/1, EP/M024385/1, EP/I035935/1, EP/M01326X/1, EP/J017175/1, EP/K021931/1] Funding Source: UKRI
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Absorption spectroscopy is routinely used to characterise chemical and biological samples. For the state-of-the-art in laser absorption spectroscopy, precision is theoretically limited by shot-noise due to the fundamental Poisson-distribution of photon number in laser radiation. In practice, the shotnoise limit can only be achieved when all other sources of noise are eliminated. Here, we use wavelength-correlated and tuneable photon pairs to demonstrate how absorption spectroscopy can be performed with precision beyond the shot-noise limit and near the ultimate quantum limit by using the optimal probe for absorption measurement-single photons. Wepresent a practically realisable scheme, which we characterise both the precision and accuracy of by measuring the response of a control feature. Wedemonstrate that the technique can successfully probe liquid samples and using two spectrally similar types of haemoglobin we show that obtaining a given precision in resolution requires fewer heralded single probe photons compared to using an idealised laser.
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