Entanglement and Extreme Spin Squeezing

Anders S. Sørensen and Klaus Mølmer
Phys. Rev. Lett. 86, 4431 – Published 14 May 2001
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Abstract

For any mean value of a Cartesian component of a spin vector we identify the smallest possible uncertainty in any of the orthogonal components. The corresponding states are optimal for spectroscopy and atomic clocks. We show that the results for different spin J can be used to identify entanglement and to quantify the depth of entanglement in systems with many particles. With the procedure developed in this Letter, collective spin measurements on an ensemble of particles can be used as an experimental proof of multiparticle entanglement.

  • Received 10 November 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.4431

©2001 American Physical Society

Authors & Affiliations

Anders S. Sørensen and Klaus Mølmer

  • Institute of Physics and Astronomy, University of Aarhus, DK-8000 Århus C., Denmark

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Vol. 86, Iss. 20 — 14 May 2001

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