Robust quantum parameter estimation: coherent magnetometry with feedback

Details Robust quantum parameter estimation: coherent magnetometry with feedback Robust quantum parameter estimation: coherent magnetometry with feedback

2003-09-11

arxiv.org/abs/quant-ph/0309101v1

Phys. Rev. A 69, 032109 (2004)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.69.032109

We describe the formalism for optimally estimating and controlling both the state of a spin ensemble and a scalar magnetic field with information obtained from a continuous quantum limited measurement of the spin precession due to the field. The full quantum parameter estimation model is reduced to a simplified equivalent representation to which classical estimation and control theory is applied. We consider both the tracking of static and fluctuating fields in the transient and steady state regimes. By using feedback control, the field estimation can be made robust to uncertainty about the total spin number.

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