Abstract
In quantum communication theory, an input signal is represented by the quantum state. The input state changes under the influence of noise and loss associated with a channel. The attenuation process is a model of quantum channel describing an optical communication process. When an input state changes to an output state through a channel, the amount of information carried from the input state to the output state is represented by the quantum mutual entropy (information). The quantum communication theory has been studied by various researchers [4–7,11,13,15,16,18].
In §1, we briefly review a quantum channel for attenuation processes, and we explain a quantum entropy and a quantum mutual entropy in quantum communication systems in §2. By using the general framework defined in [16], we discuss the convergence (speed) of the mutual entropy and mean mutual entropy for attenuation process in §3.
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Ohya, M., Watanabe, N. (1995). A Mathematical Study of Information Transmission in Quantum Communication Processes. In: Belavkin, V.P., Hirota, O., Hudson, R.L. (eds) Quantum Communications and Measurement. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1391-3_36
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DOI: https://doi.org/10.1007/978-1-4899-1391-3_36
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