Conference Paper
The multiple coding gain with two criteria in an attenuated quantum channel
Postgrad. Course in Sci. & Technol., Meijo Univ., Nagoya
DOI: 10.1109/ISITA.2008.4895459 Conference: Information Theory and Its Applications, 2008. ISITA 2008. International Symposium on Source: IEEE Xplore

Conference Paper: On attainment of the capacity of broadband quantum channel by wavelength division multiplexing
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ABSTRACT: Recently, the exact solution of the capacity of an attenuated quantum channel which is a model of a long distance optical fiber channel was derived [V. Giovannetti, et al., Phys. Rev. Lett. 90, 027902, (2004)]. In particular, the capacity of a broadband quantum channel, which is the ultimate limit of quantum communications, was shown. In this paper, we consider wavelength division multiplexing in order to attain the capacity of a broadband quantum channel.Information Theory and its Applications (ISITA), 2010 International Symposium on; 11/2010 
Conference Paper: Formula of channel matrix for coded quantum signals by classical linear codes over Zm.
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ABSTRACT: A formula of channel matrix for linear codes over Zm is presented. mary PSK coherentstates are used as letter states and the squareroot measurement (SRM) is used as a decoding. First, arbitrary linear codes over Zm are shown to group covariant. Then the formula of channel matrix is derived by generalizing [T.S. Usuda, S. Usami, I. Takumi, and M. Hata, Phys. Lett. A305, pp.125134, (2002)]. Furthermore, the usefulness of the formula is considered.Proceedings of the International Symposium on Information Theory and its Applications, ISITA 2010, 1720 October 2010, Taichung, Taiwan; 01/2010 
Conference Paper: Property of capacity by WDM for attenuated quantum channel
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ABSTRACT: In 2004, Giovannetti and others gave both the broadband and narrowband channel capacities of an attenuated quantum channel [1]. However, the derived broadband channel capacity is impossible to realize. Therefore, we treat the broadband channel capacity as an upper bound and it is necessary to derive an achievable limit. In a previous work, to show the true capacity, the capacity by wavelength division multiplexing (WDM) was defined and compared with the broadband channel capacity when there is no attenuation [7]. We consider more detailed properties of this WDM capacity and attenuated channels with frequencydependent loss.Information Theory and its Applications (ISITA), 2012 International Symposium on; 01/2012
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