Quantum Communication, Quantum Radar, and Quantum Cipher II

Dear Colleagues,

As a natural development of quantum information science, research on quantum communication, quantum radar, and quantum cryptography has been actively conducted in the field of physics and various principles have been proposed. However, at present, in the actual application environment, the research to date has not contributed to the realization of systemic devices that surpass conventional functions. Therefore, the research and development of quantum technology from an engineering and technology perspective are necessitated. In the first volume of this Special Issue, we were able to include pioneering papers reflecting research in which quantum effects outperform conventional technologies in real environments. The second volume of this Special Issue provides an opportunity for a discussion that will promote specific research on the aforementioned quantum techniques, which are effective even in poor environments. Through these two volumes, we can expect quantum communication to further expand the possibilities of ultrahigh-speed optical communication, for quantum radar to make all-weather sensors feasible, and for macroscopic quantum cryptography to contribute to enhancing the security of the physical layer of current optical networks. This Special Issue aims to consolidate and publish the latest research trends in order to fulfil the above goals. It will publish invited papers, original papers, short reviews, and proposals for future prospects. 

Prof. Dr. Osamu Hirota
Guest Editor

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• Quantum Communication, Quantum Radar, and Quantum Cipher in Entropy (10 articles)