Magnetic field sensors using 13-spin cat states

TL;DR

This paper introduces a novel 13-spin cat state sensor that leverages entanglement to surpass the standard quantum limit in magnetic field measurement sensitivity.

Contribution

It presents new methods for preparing and interpreting pseudo-entangled states and demonstrates the use of a 13-spin cat state for enhanced magnetic field sensing.

Findings

Achieved measurement sensitivity beyond the standard quantum limit.

Developed improved techniques for pseudo-entanglement preparation.

Utilized a 13-spin cat state for high-precision magnetometry.

Abstract

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.