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QI: Fachverband Quanteninformation
QI 8: Quantum Sensors and Metrology
QI 8.8: Vortrag
Mittwoch, 7. September 2022, 17:15–17:30, H9
Gradient Magnetometry with Atomic Ensembles — •Iagoba Apellaniz1, Iñigo Urizar-Lanz1, Zoltán Zimborás1,2,3, Philipp Hyllus1, and Géza Tóth1,2,4 — 1Department of Physics, University of the Basque Country UPV/EHU, P. O. Box 644, E-48080 Bilbao, Spain — 2Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, 14195 Berlin, Germany — 3Wigner Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary — 4IKERBASQUE, Basque Foundation for Science, E-48013 Bilbao, Spain
We study gradient magnetometry with ensembles of atoms with arbitrary spin. We calculate precision bounds for estimating the gradient of the magnetic field based on the quantum Fisher information. For states that are sensitive to homogeneous fields, a simultaneous measurement is needed, as the homogeneous field must also be estimated.
We present a method to calculate precision bounds for gradient estimation with two spatially separated atomic ensembles. We also consider a single atomic ensemble with an arbitrary density profile, where the atoms cannot be addressed individually, and which is a very relevant case for experiments.
[1] I. Apellaniz et al., Phys. Rev. A, 97 053603 (2018)
[2] G. Vitagliano et al., arXiv:2104.05663 (2021)