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Quantum metrology with molecular ensembles

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schaffry2010physreva042114.pdf (324.8Kb)
Date
28/10/2010
Author
Schaffry, Marcus
Gauger, Erik M.
Morton, John J. L.
Fitzsimons, Joseph
Benjamin, Simon C.
Lovett, Brendon W.
Keywords
Noon states
Limit
QC Physics
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Abstract
The field of quantum metrology promisesmeasurement devices that are fundamentally superior to conventional technologies. Specifically, when quantum entanglement is harnessed, the precision achieved is supposed to scale more favorably with the resources employed, such as system size and time required. Here, we consider measurement of magnetic-field strength using an ensemble of spin-active molecules. We identify a third essential resource: the change in ensemble polarization (entropy increase) during the metrology experiment. We find that performance depends crucially on the form of decoherence present; for a plausible dephasing model, we describe a quantum strategy, which can indeed beat the standard strategy.
Citation
Schaffry , M , Gauger , E M , Morton , J J L , Fitzsimons , J , Benjamin , S C & Lovett , B W 2010 , ' Quantum metrology with molecular ensembles ' , Physical Review. A, Atomic, molecular, and optical physics , vol. 82 , no. 4 , 042114 . https://doi.org/10.1103/PhysRevA.82.042114
Publication
Physical Review. A, Atomic, molecular, and optical physics
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevA.82.042114
ISSN
1050-2947
Type
Journal article
Rights
© 2010. The American Physical Society.
Description
This work was supported by the EPSRC through QIP IRC (Grants No. GR/S82176/01 and No. GR/S15808/01), the National Research Foundation and Ministry of Education, Singapore, the DAAD, and the Royal Society.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5206

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