Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.155304
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Funding
- Centre QUEST
- DFG (Research Training Group 1729)
- DFF
- Lundbeck Foundation
- EMRP
- EMRP participating countries within EURAMET
- European Union
- MINECO [FIS2012-36673-C03-03]
- Basque Government [IT4720-10]
- OTKA [K83858]
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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 -11: 4(5) dB.
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