Non-Equilibrium Dynamics of Quantum Dense Coding Process

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  • Yonemura Tomoko
    Graduate School of Humanities and Sciences and Department of Physics, Faculty of Science, Ochanomizu University
  • Kitajima Sachiko
    Graduate School of Humanities and Sciences and Department of Physics, Faculty of Science, Ochanomizu University
  • Shibata Fumiaki
    Graduate School of Humanities and Sciences and Department of Physics, Faculty of Science, Ochanomizu University

書誌事項

公開日
2004
DOI
  • 10.1143/jpsj.73.855
公開者
一般社団法人 日本物理学会

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説明

Theory of quantum mechanical communication channel under the influence of environmental fluctuations is formulated on the basis of non-equilibrium statistical mechanics. The formalism is explicitly applied to the quantum dense coding process where a qubit signal is sent into the channel in which the temperature and/or quantum fluctuations disturb an initial coherency of the signal. A quantum channel matrix, the Shannon’s mutual information and quantum mechanical mutual information are analytically obtained and numerically evaluated. It is shown that the temperature effect is quite large in the signal transmission processes.

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