We discussed the accuracy of the estimation of the n identical unknown actions of SU(2) with using quantum entanglement. We find that this problem has a similar structure to the same estimation problem with the knowledge of the eigenvalue, which was discussed by Bužek, Derka and Massar. When the number n of systems acted on by the unknown action is enough large, the estimation error goes to 0 with the order 1n2.

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