Skip to main content

4 Result(s)

within Tsuyoshi Sasaki Usuda Remove this filter Quantum Physics Remove this filter

and

  1. Article

    Open Access

    Security enhancement of amplitude-shift keying-type asymmetric quantum communication systems

    Recently, we proposed an amplitude-shift keying asymmetric quantum communication system and evaluated its reliability when using the quasi-Bell state and two-mode squeezed vacuum state (TSVS) as an entangled l...

    Tiancheng Wang, Tsuyoshi Sasaki Usuda in Quantum Information Processing (2024)

    Download PDF (1004 KB) View Article

  2. No Access

    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)

  3. No Access

    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)

  4. No Access

    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)