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Author: search.filters.author.Suchat, S.Subject: search.filters.subject.Quantum key distribution

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    Error corrections of quantum key distribution of the quantum codes via optical wireless link
    (2011-03-01)
    Taengtang, T.
    ;
    Praithoonwattanakit, K.
    ;
    Yupapin, P. P.
    ;
    Suchat, S.
    Quantum key generated by using a fiber optic Mach Zehnder interferometer incorporating a fiber optic ring resonator is proposed. The generated quantum key is distributed via an optical wireless link system, which is available for the free space link. The random quantum bits can be formed and used as the secret codes in quantum communication system. By adding an ancillary photon after the signal photon within the correlation time of the fiber noise and by performing quantum parity checking, the high fidelity to the noiseless quantum in free space is achieved by the technique known as the quantum error correction. © 2010 Elsevier GmbH. All rights reserved.
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    Quantum key distribution via fiber optic, fidelity and error corrections
    (2010-11-01)
    Suchat, S.
    ;
    Haisirikul, N.
    ;
    Thaengtang, T.
    ;
    Paithoonwattanakij, K.
    ;
    Yupapin, P. P.
    We propose an interesting scheme on photon states generation using a fiber optic Mach Zehnder interferometer incorporating a fiber optic ring resonator without any optical pumping parts including in the system, which is available for long-distance link. In principle, the state of a quantum bit, it is known, unknown, or entangled to other systems. The desired quantum states are generated and transmitted in the link via a fiber optic. The transmission quality in terms of quantum fidelity is analyzed, where a high fidelity to the noiseless quantum channel is achieved by adding an ancillary photon after the signal photon within the correlation time of the fiber noise and by performing the quantum parity checking method. The error correction is also analyzed. For simplicity, feature and robustness against path-length mismatches among the nodes make our scheme suitable for multi-user quantum communication networks. © 2009 Elsevier GmbH. All rights reserved.
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    Continuous variable quantum key distribution via a simultaneous optical-wireless up-down-link system
    (2010-09-01)
    Suchat, S.
    ;
    Pornsuwancharoen, N.
    ;
    Yupapin, P. P.
    We propose a remarkably simple system of a continuous variable quantum key distribution using chaotic signals generated by a soliton pulse within a nonlinear micro-ring resonator system. By using the appropriate soliton input power and micro-ring parameters, continuous signals are generated spreading over the spectrum. Polarized photons are formed incorporating the polarization control unit into the micro-ring system, which allows different time slot entangled photons to be randomly formed. Two different frequency bands for up-down-link converters can be selected (filtered) and performed, which is available for the simultaneous up-down-link application in the telephone networks. Results obtained have shown that the application of such a system for continuous variable quantum cryptography via optical-wireless up-down-link converters within a single system is plausible. © 2009 Elsevier GmbH. All rights reserved.
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