Abstract. We propose a new system of quantum key distribution via optical wireless communication links, where the required information, especially telephone conversation, can be secured by using a quantum code/decode ͑CODEC͒ technique incorporated in the networks. The entangled photons can be encoded into the classical information and then the decoded signal can also be retrieved. The proposed system consists of quantum key generation and uplink and downlink parts that can be implemented in the mobile telephone handset and networks. Such a system and technique show the feasibility of use for a perfectly security telephone networks. The mobile telephone has been widely and commonly used for nearly two decades. Because many applications can be provided by a network provider, the demand for use of the mobile phone is large. Furthermore, there are some advantages including a small size, lightweight, and especially, low cost, which means these phones can be applied worldwide. However, there is a serious problem of interception, when perfect security is required by users. Up to now, no system that can secure personal data safely from an eavesdropper has been implemented in telephone networks. Recently, Yupapin and Suchat 1 reported the use of weak light to produce nonlinear behavior of light in a fiber optic ring resonator instead of using a strong light pulse in an ordinary single-mode fiber. Four-wave mixing results from the delayed pulse trains and nonlinear Kerr-type effects in a fiber ring resonator could perform the required entangled states after certain controlled polarization states. Delayed polarization modes via the ring resonator 2 were combined, and the entangled photon states were observed and registered. In practice, the simple design and arrangement of quantum key generation can result in a quantum device for mobile telephone and realistic network use, i.e., the quantum key generation device is now possible in the micrometer scale range. An optical link has shown the potential of being used for long-distance quantum communication, where the transmission of classical and quantum channels are required to transmit via an optical wireless link and where the sender and user can confirm the requested data. Zhou et al. 3 proposed an optical fiber communication system for optical downlink transmission with remote millimeter-wave local-oscillator delivery for intermediate frequency fiber uplink transmission by a wireless transmission of several kilometers. Manderbach et al. 4 have reported on the experimental implementation of BennettBrassard 1984 ͑BB84͒-protocol-type quantum key distribution over a 144-km free-space link using weak coherent laser pulses.In this communication, we propose the concept of an optical wireless communication link for telephone networks. In this concept, we assume that quantum cryptography, quantum teleportation, quantum key and quantum coding and decoding can be implemented using an optical wireless communication link, where the uplink and downlink can be performed and used by a comm...

The use of a modified add-drop filter configured by the coupled two side rings for photon squeezing system is proposed. There are two forms of the coupling energies when photons travel around the micro -ring resonator that it is coupled by the two nonlinear side rings. They are the external disturbances known as the construction(creation, ̂ ) and destruction (annihilation, ̂) energy operators, which can disturb the traveling photons on the nonlinear microring resonator, from which the nonlinear behaviour called a four-wave mixing (FWM) is introduced by the coupled rings, which leads the system being unstable from the harmonic motion, from which the squeezed photons can occur. In a simulation, the obtained result of such a proposed behavior is confirmed by using the commercial Opti-wave and MATLAB software programs, whereas the suitable simulation parameters were chosen, the quantum harmonic squeezed photon theory is also reviewed, and the numerical details were given.

Past and slow light behaviors are the interesting aspects of light which can be useful for many fundamental and applied researches. Pornsuwancharoen and Yupapin et al. [1] have proposed the use of a simple device called “microring resonator” to perform such behaviors. In this research work, the four different behaviors of light i.e., fast, slow, stopping and storing of light where investigated using a ring resonator. Nowadays, stopping or cooling light beam has become the promising technique for atom/molecule trapping investigations (using static or dynamic tweezers), especially, after the announcement of Nobel Prize 2012 in Physics on the whispering gallery modes [2, 3]. There are two more kinds of devices that can be used to trap light beams, the use of microcavity arrays performed by Yanik and Fan [4], and nonlinear microring resonator by Yupapin and Pornsuwancharoen [5] for stopping light (laser beam). Nanyang Technological University scientists have also done experiment to slowing the light in microresonators using a microring system recently [6]. This concept is a concrete backbone for many applications.

We propose a new system for multi-entangled photons generation using an all fiber optic arrangement. The generation of the entangled states of two, four and eight entangled photons using an all fiber optic scheme is analyzed. The timing-walk off on the entangled state of two and four entangled photons suffering from the polarization in fiber optic is characterized. The compensation of such effects and the optimal entangled states of the entangled photons in fiber optic are analyzed and discussed.

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