Journal
PHYSICAL REVIEW A
Volume 82, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.022330
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Funding
- Engineering and Physical Sciences Research Council through the Quantum Information Processing-Interdisciplinary Research Collaboration [GR/S82176/01]
- Centre for Advanced Electron Spin Resonance [EP/D048559/1]
- EPSRC [EP/D048559/1, EP/H025952/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D048559/1, EP/H025952/1] Funding Source: researchfish
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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 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.
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