Spin Squeezing Property of Weighted Graph States
arXiv:1204.6479 · doi:10.1103/PhysRevA.86.023812
Abstract
We study the spin squeezing property of weighted graph states, which can be used to improve the sensitivity in interferometry. Decoherence reduces the spin squeezing property but the result remains superior over other reference schemes with GHZ-type maximally entangled states and product states. We study the time evolution of spin squeezing of weighted graph states coupled to different decoherence channels. Based on the analysis, the spin squeezing of the weighted graph states is robust in the presence of decoherence and the decoherence limit in the improvement of the interferometric sensitivity is still achievable.
12 pages, 15 figures. Some sentences were rewritten
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