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Entropy 2016, 18(4), 116;

The Effect of Spin Squeezing on the Entanglement Entropy of Kicked Tops

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
Complexity Institute, Nanyang Technological University, 18 Nanyang Drive, Singapore 637723, Singapore
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editors: Gerardo Adesso and Jay Lawrence
Received: 20 November 2015 / Revised: 14 March 2016 / Accepted: 22 March 2016 / Published: 2 April 2016
(This article belongs to the Special Issue Entanglement Entropy)
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In this paper, we investigate the effects of spin squeezing on two-coupled quantum kicked tops, which have been previously shown to exhibit a quantum signature of chaos in terms of entanglement dynamics. Our results show that initial spin squeezing can lead to an enhancement in both the entanglement rate and the asymptotic entanglement for kicked tops when the initial state resides in the regular islands within a mixed classical phase space. On the other hand, we found a reduction in these two quantities if we were to choose the initial state deep inside the chaotic sea. More importantly, we have uncovered that an application of periodic spin squeezing can yield the maximum attainable entanglement entropy, albeit this is achieved at a reduced entanglement rate. View Full-Text
Keywords: quantum entanglement; chaos; quantum squeezing quantum entanglement; chaos; quantum squeezing

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Ong, E.T.S.; Chew, L.Y. The Effect of Spin Squeezing on the Entanglement Entropy of Kicked Tops. Entropy 2016, 18, 116.

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