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Author: search.filters.author.Suchat, S.Subject: search.filters.subject.Quantum dense coding

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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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    An experiment of optical encryption technique with quantum security for mobile phone up-link converter
    (2002-01-01)
    Suchat, S.
    ;
    Paiboon, S.
    ;
    Yupapin, P. P.
    The data encryption/decryption is employed to secure the transported data that is now become very importance issue for communication and networks. However, the general encryption is not absolute secure of the required information. The absolute security technique is known as quantum security where the principle of the technique is that the required data is encrypted/decrypted by quantum transported channel. The transported signals are randomly coded/decoded by using the quantum entanglement pairs. The quantum entangle is created by using a single pulse i.e. single photon that occupies the random polarization states, where the required polarization states can be formed be sender and receiver at any time linking by quantum channel. In this paper, the single pulse is created by a CW laser diode that is launched into the classical Mach-Zehnder Interferometer. The single pulse is generated and detected when a light beam is modulated by signal from signal generator with suitable driven frequency on a LiNbO<inf>3</inf> crystal. Then the entanglement signals can be realized and transmitted via classical optical system. The quantum dense coding can also be performed by the technique of dense wavelength division multiplexing technique, where each of transmitted wavelengths can be randomly formed entanglement pairs, then the dense code/decode schemes can be employed and linked via cable or wireless transmission.