Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.040403
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Funding
- U. S. Office of Naval Research [N00014-07-1-0304]
- Australian Research Council's Discovery Projects [DP0343094]
- National Nuclear Security Administration of the U. S. Department of Energy [DE-AC52-06NA25396]
- Perimeter Institute for Theoretical Physics
- Industry Canada
- Ministry of Research Innovation
- Australian Research Council [DP0343094] Funding Source: Australian Research Council
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A parameter whose coupling to a quantum probe of n constituents includes all two-body interactions between the constituents can be measured with an uncertainty that scales as 1/n(3/2), even when the constituents are initially unentangled. We devise a protocol that achieves the 1/n(3/2) scaling without generating any entanglement among the constituents, and we suggest that the protocol might be implemented in a two-component Bose-Einstein condensate.
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