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Mean spin direction and spin squeezing in superpositions of spin coherent states

100%
Yan D., Wang X., Song L., Zong Z.
Open Physics
|
2007
|
vol. 5
|
issue 3
367-376
EN
We consider the mean spin direction (MSD) of superpositions of two spin coherent states (SCS) | ± μ〉, and superpositions of | μ〉 and | μ*〉 with a relative phase. We find that the azimuthal angle exhibits a π transition for both states when we vary the relative phase. The spin squeezing of the states, and the bosonic counterpart of the mean spin direction are also discussed.
2
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Entanglement conditions for four-mode states via the uncertainty relations in conjunction with partial transposition

76%
Song L., Wang X., Yan D., Li Y.
Open Physics
|
2008
|
vol. 6
|
issue 2
199-204
EN
From the Heisenberg uncertainty relation in conjunction with partial transposition, we derive a class of inequalities for detecting entanglements in four-mode states. The sufficient conditions for bipartite entangled states are presented. We also discuss the generalization of the entanglement conditions via the Schrödinger-Robertson indeterminacy relation, which are in general stronger than those based on the Heisenberg uncertainty relation.
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