Abstract
The general quantum communication process, with the optical communication process as its actual model, is strictly formulated mathematically in terms of Ohya's quantum mechanics channel, which describes the state change. Until recently the decay process and the amplifier process have been described as actual communication processes, using the concepts of the channel and its extension, lifting. Based on that description, the error probability and SNP are derived. This paper introduces a new system called the control system into the communication process, and provides the squeezed vacuum state as the quantum state of the system. We examine how conventional communication efficiency can be improved by the squeezed vacuum state, using the error probability. © 1998 Scripta Technica. Electron Comm Jpn Pt 3, 81(7): 18–27, 1998
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