Abstract
We investigate the properties of spin squeezing in a general superposition of multi-qubit GHZ state and W state. It is shown that the mean spin direction is determined by the coefficients of superposition and the relative phase between the GHZ state and the W state; while the length of mean spin and spin squeezing parameter are only determined by coefficient of superposition.
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Yi, XJ., Wang, JM. Spin Squeezing of Superposition of Multi-Qubit GHZ State and W State. Int J Theor Phys 50, 2520–2525 (2011). https://doi.org/10.1007/s10773-011-0741-y
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DOI: https://doi.org/10.1007/s10773-011-0741-y