Quantum key distribution via an optical wireless communication link for telephone networks

Abstract

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...

Generalized fast and slow lights using multi-state microring resonators for optical wireless links

“…By using the proposed system, a wide range of the spread wavelength domain can also be generated and can thus become available, which means that the wavelength multiplexing, especially dense wavelength division multiplexing (DWDM) via optical wireless link, is plausible. Moreover, the use of quantum key distribution via optical wireless is confirmed by Suchat et al [8] and it is plausible.…”

Chaotic signal generation and coding using a nonlinear micro ring resonator

“…The selected input signals can be used to control the required chaotic encoding, which can be distributed into the optical transmission link. The most important advantage of the proposed system is the easy implementation compared to the well-known secure communication technique called quantum cryptography [14], which will be extremely difficult in the realistic system, while the requirement in terms of security is acceptable. Eventually, the required information can be retrieved when the decode technique and the tunable filters are employed by the required clients.…”

Thermal dissipation effects of the entangled photon generated by a nonlinear ring resonator

“…The advantage of using an entangled photon pair over a single photon is that it has more reliable energy to perform the realistic application, while the entangled photon pair is enough to form the required random encryption code. Several schemes have proposed the use of the polarized photon in fiber optic to generate the entangled pair [3][4][5], where the technique known as quantum cryptography could be formed and utilized the idea of perfect communication security. Further, we have evidence that a micro ring device is fabricated and used to replace the fiber ring resonator [6,7], where the more interesting application concept is that such a device can be implemented into the small device, for instance, mobile telephone hand set.…”