4.7 Article

One-way deficit and Holevo quantity of generalized n-qubit Werner state

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Summary: The importance of Holevo quantity and SU(2)-invariant states in quantum information processing is explored. The analytical calculation of Holevo quantity for bipartite systems composed of spin-j and spin-1/2 subsystems with SU(2) symmetry is performed, specifically when projective measurements are conducted on the spin-1/2 subsystem. The relationships between Holevo quantity, its maximal values, and the states are analyzed in detail. The study reveals that the Holevo quantity increases in a certain parameter region and decreases in another as the spin-j increases. The maximum value of the Holevo quantity is achieved at a specific parameter value, and it decreases as the dimension of the system increases.

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