Abstract
Recent experiments demonstrate the production of many thousands of neutral atoms entangled in their spin degrees of freedom. We present a criterion for estimating the amount of entanglement based on a measurement of the global spin. It outperforms previous criteria and applies to a wider class of entangled states, including Dicke states. Experimentally, we produce a Dicke-like state using spin dynamics in a Bose-Einstein condensate. Our criterion proves that it contains at least genuine 28-particle entanglement. We infer a generalized squeezing parameter of .
- Received 27 February 2014
DOI:https://doi.org/10.1103/PhysRevLett.112.155304
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© 2014 Published by American Physical Society
Synopsis
Measuring Entanglement Among Many Particles
Published 17 April 2014
Multiparticle entanglement has been difficult to characterize, but a new method provides a way to assess this with measurements of the total spin.
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