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- W2092137951 abstract "In terms of quantum Fisher information (QFI), a quantity χ 2 was introduced by Pezzé and Smerzi (Phys. Rev. Lett. 102 100401, 2009). They pointed out that the inequality χ 2<1 was a sufficient condition for multiparticle entanglement. For the two-qubit symmetric states, we found that the inequality χ 2<1 is a necessary and sufficient condition for entanglement and spin squeezing, and that χ 2 is equal to the second kind of spin squeezing parameter $xi _{2}^{2}$ . For the two-qubit asymmetric states, it is only a sufficient condition. In order to make it a necessary and sufficient condition, we extend the concept of the QFI and χ 2, and generalize the relations among the entanglement measurement, the spin squeezing parameters and χ 2 in symmetric pure states to arbitrary pure states." @default.
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- W2092137951 date "2010-07-28" @default.
- W2092137951 modified "2023-09-27" @default.
- W2092137951 title "Quantum Fisher Information in Two-Qubit Pure States" @default.
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- W2092137951 doi "https://doi.org/10.1007/s10773-010-0432-0" @default.
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