Phys. Rev. A 82, 022330 (2010) [5 pages]Magnetic field sensors using 13-spin cat statesReceived 9 July 2009; published 26 August 2010 Measurement devices could benefit from entangled correlations to yield a measurement sensitivity approaching the physical Heisenberg limit. Building upon previous magnetometric work using pseudoentangled spin states in solution-state NMR, we present two conceptual advancements to better prepare and interpret the pseudoentanglement resource. We apply these to a 13-spin cat state to measure the local magnetic field with a 12.2 sensitivity increase over an equivalent number of isolated spins. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.82.022330
DOI:
10.1103/PhysRevA.82.022330
PACS:
03.67.Mn, 07.55.Ge, 76.60.-k
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