Capacity with energy constraint in coherent state channel

Authors:
Masahito Hayashi
Affiliations:
Graduate School of Information Sciences, Tohoku University, Sendai, Japan
Venue:
IEEE Transactions on Information Theory
Year:
2010

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Abstract

In this paper, we consider two kinds of energy constraints when the output state is a coherent state. Conventional constraint is a constraint on the total energy per a smgle communiation mode. This paper proposes another energy constraints, which is a constraint on the total energy during a fixed period. The first setting can be easily dealt with by using the conventional capacity formula. This paper analyzes the second setting when the number of communication modes is or is not limited.