Measurement devices could benefit from entangled correlations to yield a measurement sensitivity approaching the physical Heisenberg limit. Building upon previous magnetometric work using pseudo-entangled spin states in solution-state NMR, we present two conceptual advancements to better prepare and interpret the pseudo-entanglement resource as well as the use of a 13-spin cat state to measure the local magnetic field with a sensitivity beyond the standard quantum limit.
@article{arxiv.0907.1372,
title = {Magnetic field sensors using 13-spin cat states},
author = {Stephanie Simmons and Jonathan A. Jones and Steven D. Karlen and Arzhang Ardavan and John J. L. Morton},
journal= {arXiv preprint arXiv:0907.1372},
year = {2010}
}
Comments
6 pages, 5 figures; v2: corrected figure 3, expanded conclusion, simplified explanation of equation 2; v3: accepted version