Magnetic field sensors using 13-spin cat states

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Authors
Simmons, Stephanie
Jones, Jonathan A.
Karlen, Steven D.
Ardavan, Arzhang
Morton, John J. L.
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Abstract
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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.
Comment: 6 pages, 5 figures; v2: corrected figure 3, expanded conclusion, simplified explanation of equation 2; v3: accepted version
Keywords
Quantum Physics
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