Abstract
We report the generation of long-range entanglement in a macroscopic spin singlet (MSS) [1,2] via collective quantum non-demolition (QND) measurement [3] a global entanglement method predicted [4] to produce entanglement at all length scales. In a cold 87Rb spin ensemble of up to 2 × 106 atoms, we generate a MSS, entangling at least half of the atoms. Using a gradient field to convert singlets to triplets, we detect the decay of entanglement in the MSS via spin noise spectroscopy [4] consistent with a mean entanglement length comparable to the size of the atom cloud (~ 4mm), three orders of magnitude larger than previously detected in atomic spin systems [5].
© 2015 IEEE
PDF ArticleMore Like This
Naeimeh Behbood, Mario Napolitano, Giorgio Colangelo, Brice Dubost, Silvana Palacios Álvarez, Robert J. Sewell, Geza Tóth, and Morgan W. Mitchell
QM1B.2 Quantum Information and Measurement (QIM) 2012
Naeimeh Behbood, Mario Napolitano, Giorgio Colangelo, Brice Dubost, Silvana Palacios Álvarez, Robert J. Sewell, Geza Tóth, and Morgan W. Mitchell
QF3E.3 Quantum Electronics and Laser Science Conference (CLEO:FS) 2012
Naeimeh Behbood, Brice Dubost, Mario Napolitano, Marco Koschorreck, Robert J. Sewell, Geza Tóth, and Morgan W. Mitchell
EC1_2 European Quantum Electronics Conference (EQEC) 2011