Quantum metrology with molecular ensembles

Marcus Schaffry*, Erik M. Gauger, John J. L. Morton, Joseph Fitzsimons, Simon C. Benjamin, Brendon W. Lovett

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


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.

Original languageEnglish
Article number042114
Number of pages5
JournalPhysical Review. A, Atomic, molecular, and optical physics
Issue number4
Publication statusPublished - 28 Oct 2010


  • Noon states
  • Limit


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