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    Chapter

    Superadditivity in Capacity of Quantum Channel by Classical Pseudo-Cyclic Codes

    Analytical solution of mutual information by square-root measurement for binary linear code is given. Applying the solution, we show properties of superadditivity in capacity by BCH codes with codeword length ...

    Shogo Usami, Tsuyoshi Sasaki Usuda… in Quantum Communication, Computing, and Meas… (2002)

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    Chapter

    Group Covariant Signals in Quantum Information Theory

    Necessary and sufficient condition for group covariant signals is given. This condition shows what kind of signals correspond to “group covariant signals.” We show by applying this condition that many signals,...

    Tsuyoshi Sasaki Usuda, Ichi Takumi in Quantum Communication, Computing, and Measurement 2 (2002)

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    Chapter

    Property of Mutual Information for M-ary Quantum-State Signals

    Numerical solutions of maximum mutual information for 3-ary phase-shift keyed coherent-state signals and 3-ary real-symmetric (lifted trine) signals, which are linearly independent signals, are shown. A condit...

    Tsuyoshi Sasaki Usuda, Ichi Takumi… in Quantum Communication, Computing, and Meas… (2002)

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    Chapter

    An Example of a Received Quantum State Controller by Optical Kerr Effect

    According to recent development of optical technology, performance of optical communication system almost achieves the theoretical limitation predicted by classical communication theory, which is so called sta...

    Tsuyoshi Sasaki-Usuda, Osamu Hirota in Quantum Communications and Measurement (1995)