Development of quantum communication system in photon-frequency basis using fiber optic components

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A recent surge in demand for secure communication has spurred interest in developing a viable quantum communication protocol. Here it is demonstrated that the unprecedented frequency degree of freedom of light is rather suited for this purpose, as opposed to the many that call for specialty hardware to implement with. In fact, ubiquitous fiber optic components conveniently can provide its platform simply by introducing interference of the electric fields associated with the otherwise non-overlapping subbands of frequency(wavelength)-division multiplexing. An alternative quantum key distribution scheme is proposed and implemented by taking advantage of single photon interference in the time domain.