Cryptography – Communication system using cryptography – Fiber optic network
Reexamination Certificate
2011-01-11
2011-01-11
Moazzami, Nasser (Department: 2436)
Cryptography
Communication system using cryptography
Fiber optic network
C380S224000, C380S239000, C380S259000, C380S268000
Reexamination Certificate
active
07869600
ABSTRACT:
A dynamic range of intensity modulation is set to range from a maximum intensity Smax to a minimum intensity Smin. A difference Δ(=Smax−Smin) between the maximum intensity Smax and the minimum intensity Smin is divided by the number 2M of multilevel signals. Thus, a distance (an intensity difference) between adjacent signals is [Δ/2M]. The number 2M of multilevel signals is selected such that the distance [Δ/2M] between adjacent multilevel signals (between an intensity Siand an intensity Si+1) is sufficiently buried within a range of quantum fluctuations obtained when heterodyne measurements are made or buried within a range of quantum shot noise obtained when a direct detection is made. Bases of a basis group are each positioned for intensity signals so as to have a high intensity and a low intensity between which a distance is set to be a certain value smaller than a middle point intensity [Δ/2]. Note that adjacent bases are set to have an intensity signal transmitting a logical value “1” of transmission data and an intensity signal transmitting a logical value “0” of transmission data in an inverted manner.
REFERENCES:
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O. Hirota et al., “Quantum Stream Cipher Based on Optical Communications”, SPIE Proc. on Quantum Communication, vol. 5551, Jul. 8, 2004.
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G. A. Barbosa et al., “Secure Communication Using Mesoscopic Coherent States”, Phys. Rev. Lett., vol. 90, 227901, Jun. 6, 2003.
Fuse Masaru
Hirota Osamu
Souma Masaki
Moazzami Nasser
Panasonic Corporation
Reza Mohammad W
Wenderoth , Lind & Ponack, L.L.P.
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