KIP publications

 
year 2014
author(s) W. Muessel, H. Strobel, D. Linnemann, D. B. Hume, and M. K. Oberthaler
title Scalable Spin Squeezing for Quantum-Enhanced Magnetometry with Bose-Einstein Condensates
KIP-Nummer HD-KIP 14-66
KIP-Gruppe(n) F20
document type Paper
Keywords Scalable Spin Squeezing, Quantum-Enhanced Magnetometry, Bose-Einstein Condensates
source Phys. Rev. Lett. 113, 103004 – Published 2014, 5 pages , arXiv:1405.6022
doi http://dx.doi.org/10.1103/PhysRevLett.113.103004
Abstract (en)

A major challenge in quantum metrology is the generation of entangled states with a macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing generated via nonlinear 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 12 300 particles, from which we infer that similar squeezing can be obtained for more than 107 atom. 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 μm3.

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URL Scalable Spin Squeezing for Quantum-Enhanced Magnetometry with Bose-Einstein Condensates Phys. Rev. Lett. 113, 103004 – Published 5 September 2014 W. Muessel, H. Strobel, D. Linnemann, D. B. Hume, and M. K. Oberthaler
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