Generation of macroscopic singlet states in a cold atomic ensemble

Behbood, N. and Martin, Ciurana F. and Colangelo, G. and Napolitano, M. and Tóth, Géza and Sewell, R. J. and Mitchell, M. W. (2014) Generation of macroscopic singlet states in a cold atomic ensemble. PHYSICAL REVIEW LETTERS, 113 (9). ISSN 0031-9007

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Abstract

We report the generation of a macroscopic singlet state in a cold atomic sample via quantum non- demolition (QND) measurement induced spin squeezing. We observe 3 dB of spin squeezing and detect entanglement with 5σ statistical significance using a generalized spin squeezing inequality. The degree of squeezing implies at least 50% of the atoms have formed singlets.

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