Abstract
The general one-particle spin states are considered. It is shown that information contained in a spin-1/2 state can be recorded in an equivalent form with the help of three mixed completely decoherent qubit states. The density matrix of such a system has the form of the tensor product of three diagonal matrices. The linear operator defined in the space of one-particle spin states generates some transform of the tensor products of the diagonal matrices. We construct this transform in the explicit form.
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Adam, P., Andreev, V.A., Janszky, J. et al. Tensor product representation of qubit and its transform under linear-operator action. J Russ Laser Res 30, 109–121 (2009). https://doi.org/10.1007/s10946-009-9067-0
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DOI: https://doi.org/10.1007/s10946-009-9067-0