Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.82.042114
Title: Quantum metrology with molecular ensembles
Authors: Schaffry, M.
Gauger, E.M.
Morton, J.J.L.
Fitzsimons, J.
Benjamin, S.C. 
Lovett, B.W.
Issue Date: 28-Oct-2010
Source: Schaffry, M., Gauger, E.M., Morton, J.J.L., Fitzsimons, J., Benjamin, S.C., Lovett, B.W. (2010-10-28). Quantum metrology with molecular ensembles. Physical Review A - Atomic, Molecular, and Optical Physics 82 (4) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.82.042114
Abstract: The field of quantum metrology promises measurement 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. © 2010 The American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/112498
ISSN: 10502947
DOI: 10.1103/PhysRevA.82.042114
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