Thursday, June 13, 2013

1306.2825 (A R Usha Devi et al.)

Equivalence of classicality and separability based on P phase-space
representation of symmetric multiqubit states
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A R Usha Devi, A K Rajagopal, Sudha, H S Karthik, J Prabhu Tej
Classical and quantum world views differ in peculiar ways. Understanding decisive quantum features -- for which no classical explanation exist -- and their interrelations is of foundational interest. Moreover, recognizing non-classical features carries practical significance in information processing tasks as it offers insights as to why quantum protocols work better than their classical counterparts. We focus here on two celebrated notions of non-classicality viz., negativity of P phase-space representation and entanglement in symmetric multiqubit systems. We prove that they imply each other.
View original: http://arxiv.org/abs/1306.2825

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