Experimental implementation of an NMR NOON state thermometer

Utilizing the highly correlated quantum NOON states of spins, we have implemented a proof-of-principle quantum thermometer using the NMR technique for measuring the variation of local magnetic field with the temperature. The system used was the star topology system of hexafluorophosphate molecules,...

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Bibliographic Details
Published in:Quantum information processing 2019-09, Vol.18 (9), p.1-13, Article 294
Main Authors: Uhlig, C. V. H. B., Sarthour, R. S., Oliveira, I. S., Souza, A. M.
Format: Article
Language:English
Subjects:
Data Structures and Information Theory
Magnetic fields
Mathematical Physics
NMR
Noon
Nuclear magnetic resonance
Physics
Physics and Astronomy
Quantum Computing
Quantum Information Technology
Quantum Physics
Spintronics
Topology
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Summary:Utilizing the highly correlated quantum NOON states of spins, we have implemented a proof-of-principle quantum thermometer using the NMR technique for measuring the variation of local magnetic field with the temperature. The system used was the star topology system of hexafluorophosphate molecules, and the thermometer showed a sensitivity of 85 nT / ∘ C. Using the hexafluorophosphate and the trimethylphosphite spin systems, we have quantified the advantage of the quantum protocol over the classical one for measuring magnetic field. The quantum protocol showed the best performance for the sensing time of T max = 20 ms, where the errors in the measurement scaled as the Heisenberg limit 1 /  N . The thermometer implementation provided measurements in the temperature with errors scaling approximately with the Heisenberg limit, more precisely N - 0.94 .
ISSN:1570-0755
1573-1332
DOI:10.1007/s11128-019-2406-3