Scalable Spin Squeezing for Quantum-Enhanced Magnetometry with Bose-Einstein Condensates
Abstract
A major challenge in quantum metrology is the generation of entangled states with macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing generated via non-linear dynamics in Bose Einstein condensates, combined with suitable trap geometries, allows scaling to large ensemble sizes. We achieve a suppression of fluctuations by 5.3(5) dB for 12300 particles, which implies that similar squeezing can be achieved for more than 10 atoms. With this resource, we demonstrate quantum-enhanced magnetometry by swapping the squeezed state to magnetically sensitive hyperfine levels that have negligible nonlinearity. We find a quantum-enhanced single-shot sensitivity of 310(47) pT for static magnetic fields in a probe volume as small as 90 m.
Cite
@article{arxiv.1405.6022,
title = {Scalable Spin Squeezing for Quantum-Enhanced Magnetometry with Bose-Einstein Condensates},
author = {W. Muessel and H. Strobel and D. Linnemann and D. B. Hume and M. K. Oberthaler},
journal= {arXiv preprint arXiv:1405.6022},
year = {2015}
}
Comments
12 pages, 9 figures