Magnetic Field Sensing Beyond the Standard Quantum Limit Using 10-Spin NOON States

DOI Web Site 19 Citations
  • Jonathan A. Jones
    Centre for Advanced Electron Spin Resonance (CAESR), Clarendon Laboratory, Oxford University, Oxford OX1 3PU, UK.
  • Steven D. Karlen
    Department of Materials, Oxford University, Oxford OX1 3PH, UK.
  • Joseph Fitzsimons
    Department of Materials, Oxford University, Oxford OX1 3PH, UK.
  • Arzhang Ardavan
    Centre for Advanced Electron Spin Resonance (CAESR), Clarendon Laboratory, Oxford University, Oxford OX1 3PU, UK.
  • Simon C. Benjamin
    Department of Materials, Oxford University, Oxford OX1 3PH, UK.
  • G. Andrew D. Briggs
    Department of Materials, Oxford University, Oxford OX1 3PH, UK.
  • John J. L. Morton
    Centre for Advanced Electron Spin Resonance (CAESR), Clarendon Laboratory, Oxford University, Oxford OX1 3PU, UK.

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Description

<jats:title>Quantum-Enhanced Measurement</jats:title> <jats:p> The single electron spin in a molecule, atom, or quantum dot precesses in a magnetic field and so can be used as a magnetic field sensor. As the number of spins in a sensor increases, so too does the sensitivity. Quantum mechanical entanglement of the spin ensemble should then allow the sensitivity to increase much more than would be expected from a simple increase in the number of individual spins in the ensemble. Using the highly symmetric molecule, trimethyl phosphite, a molecule containing a central P atom surrounded by nine hydrogen atoms, <jats:bold> Jones <jats:italic>et al.</jats:italic> </jats:bold> (p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="1166" related-article-type="in-this-issue" vol="324" xlink:href="10.1126/science.1170730">1166</jats:related-article> , published online 23 April) quantum mechanically entangled the 10 spins (or qubits) to generate a nearly 10-fold enhancement in the magnetic field sensitivity. The results pave the way for the further development of quantum sensors. </jats:p>

Journal

  • Science

    Science 324 (5931), 1166-1168, 2009-05-29

    American Association for the Advancement of Science (AAAS)

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