Variational optimization on dipolar spin chains reaches 0.92 of the quantum Fisher information benchmark for joint magnetometry and gradiometry, delivering a 4.2x advantage over the standard quantum limit.
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Variational Joint Magnetometry and Gradiometry on Dipolar Spin Chains
Variational optimization on dipolar spin chains reaches 0.92 of the quantum Fisher information benchmark for joint magnetometry and gradiometry, delivering a 4.2x advantage over the standard quantum limit.