Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 61: Quantum Information: Concepts and Methods 4
Q 61.10: Talk
Friday, March 18, 2011, 12:45–13:00, SCH A118
Differencial Magnetometry with Multipartite Singlets — •Iñigo Urizar-Lanz1 and Géza Tóth1,2,3 — 1Theoretical Physics, The University of the Basque Country, E-48080 Bilbao, Spain — 2IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao, Spain — 3Research Institute for Solid State Physics and Optics, H-1525 Budapest, Hungary
We present a method for measuring the gradient of a magnetic field using a multi-qubit singlet state taking advantage of the fact that the singlet state is insensitive to homogenous fields. By measuring the time dependence of the variance of the collective angular momentum operators, we obtain the gradient of the magnetic field. We present realistic calculations for singlet states realized in a spin chain or with cold atomic ensembles.