Document Detail

Magnetic sensitivity beyond the projection noise limit by spin squeezing.
MedLine Citation:
PMID:  23368463     Owner:  NLM     Status:  In-Data-Review    
We report the generation of spin squeezing and entanglement in a magnetically sensitive atomic ensemble, and entanglement-enhanced field measurements with this system. A maximal m_{f}=±1 Raman coherence is prepared in an ensemble of 8.5×10^{5} laser-cooled ^{87}Rb atoms in the f=1 hyperfine ground state, and the collective spin is squeezed by synthesized optical quantum nondemolition measurement. This prepares a state with large spin alignment and noise below the projection-noise level in a mixed alignment-orientation variable. 3.2 dB of noise reduction is observed and 2.0 dB of squeezing by the Wineland criterion, implying both entanglement and metrological advantage. Enhanced sensitivity is demonstrated in field measurements using alignment-to-orientation conversion.
R J Sewell; M Koschorreck; M Napolitano; B Dubost; N Behbood; M W Mitchell
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Publication Detail:
Type:  Journal Article     Date:  2012-12-19
Journal Detail:
Title:  Physical review letters     Volume:  109     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2013-02-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  253605     Citation Subset:  IM    
ICFO-Institut de Ciencies Fotoniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain.
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