Suppression of spin projection noise in broadband atomic magnetometry.
We demonstrate that quantum nondemolition measurement, combined with a suitable parameter estimation procedure, can improve the sensitivity of a broadband atomic magnetometer by reducing uncertainty due to spin projection noise. Furthermore, we provide evidence that real-time quantum feedback control offers robustness to classical uncertainties, including shot-to-shot atom number fluctuations, that would otherwise prevent quantum-limited performance.
Geremia
J M
JM
Physics and Control & Dynamical Systems, California Institute of Technology, Pasadena California 91125, USA. jgeremia@Caltech.EDU
Stockton
John K
JK
Mabuchi
Hideo
H