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quant-ph2005★ 19 cited
Local Invariants and Pairwise Entanglement in Symmetric Multi-qubit System
A. R. Usha Devi, M. S. Uma, R. Prabhu +1
Pairwise entanglement properties of a symmetric multi-qubit system are analyzed through a complete set of two-qubit local invariants. Collective features of entanglement, such as s…
quant-ph2003★ 24 cited
Spin squeezing criterion with local unitary invariance
A. R. Usha Devi, Xiaoguang Wang, Barry C Sanders
We propose a new spin squeezing criterion for arbitrary multi-qubit states that is invariant under local unitary operations. We find that, for arbitrary pure two-qubit states, spin…
quant-ph2000
Spin Distributions for Bipartite Quantum Systems
A. R. Usha Devi
We carryout a comparative study of spin distributions defined over the sphere for bipartite quantum spin assemblies. We analyse Einstein-Podolsky-Rosen-Bohm (EPRB) spin correlation…