Berlin 2014 – wissenschaftliches Programm
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.72: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Accuracy bounds for gradient metrology with PI atomic ensembles — •Iagoba Apellaniz1, Iñigo Urizar-Lanz1, Zoltán Zimboras1, and Géza Toth1, 2, 3 — 1Dept. of Theoretical Physics, University of the Basque Country, Leioa, Spain. — 2IKERBASQUE, Basque Foundation for Science, Bilbao, Spain — 3Wigner Research Center for Physics, Hungarian Academy of Science, Budapest, Hungary
We study gradient magnetometry with atomic ensembles. The accuracy bounds for the estimation of the gradient for a single atomic ensemble is determined, assuming that the state of the ensemble is permutationally invariant. Our bounds are obtained from calculations based on the multi-parametric quantum Fisher information, and they are generally valid for all possible measurements.
A setup with a single atomic ensemble has several advantages: (i) the spatial resolution can be better and the experimental requirements are smaller since they are globally prepared, and (ii) single ensemble states insensitive to homogeneous fields, for instance singlet states, can also be used and they make it possible to measure the gradient without the need to measure the homogeneous field.