Magnetic Field Estimation at and beyond 1/N Scaling via an Effective Nonlinearity

• DOI: 10.48550/arxiv.0708.2730
• Publication Date: 2007-01-01
• Authors: Chase, Bradley A.; Partner, Heather L.; Black, Brigette D.; Baragiola, Benjam...; Cook, Robert L.; Geremia, JM
• Keywords: Quantum Physics; 0202 electrical engineering, electronic engineering, information engineering; FOS: Physical sciences; 02 engineering and technology; Quantum Physics (quant-ph)

We provide evidence, based on direct simulation of the quantum Fisher information, that 1/N scaling of the sensitivity with the number of atoms N in an atomic magnetometer can be surpassed by double-passing a far-detuned laser through the atomic system during Larmor precession. Furthermore, we predict that for N>>1, the proposed double-pass atomic magnetometer can essentially achieve 1/N scaling without requiring any appreciable amount of entanglement.<br/>Please visit http://qmc.phys.unm.edu/ to download additional resources, including all source code and data files used to produce this manuscript<br/>