Highly Efficient Quantum Key Distribution System
Summary Quantum key distribution exploits the transmissiondetection of single photons’ quantum states to generatedistribute secure keys, allowing absolutely secure communication. We use a self-developed miniature single-photon source, together with the single-photon wavepacket engineering, to implement a highly efficient protocol of differential-phase-shift quantum key distribution. Using the Campus Fiber Network between National Tsing Hua UniversityNational Chiao Tung University, we demonstrate Taiwan’s first outdoor quantum key distribution. The technology not only benefits the development of distance unlimited absolutely secure communication networks for the commercialmilitary uses, but also opens up new opportunities for the R&Dmarkets in industry.        br /
Current quantum key distribution suffer from the low efficiency of creating a key bit from a photon. The key creation efficiency is determined, in good part, by the quantum efficiency of single-photon detectors. Our self-developed miniature single-photon source uses monolithic doubly resonant parametric down-conversion to prolong the coherence time of the single photons. Together with the single-photon wavepacket engineering, we distribute a photon equally in three pulses to implement a highly efficient protocol of differential-phase-shift quantum key distribution (90 key creation efficiency). Using the Campus Fiber Network between National Tsing Hua UniversityNational Chiao Tung University, we demonstrate Taiwan’s first outdoor quantum key distribution. The technology not only benefits the development of absolutely secure communication networks for the commercialmilitary uses, but also opens up new opportunities for the R&Dmarkets in industry.br /
Quantum key distribution allows the users with the keys to implement the uncrackable symmetric key algorithmsabsolutely secure communication. The technology not only can replace the need of key distribution by courier but also benefits the development of distance unlimited absolutely secure communication networks for the commercialmilitary uses by the government, corporations,military. The development of quantum key distribution will also spur the development of the highefficiency single-photon detectors, the high-speed intensityphase modulators,even the highly efficient single-photon sources, which are also the essential elements for applications such as the optical communication, optical LIDAR, observatory astronomy,biological imaging. 
Keyword Quantum Communication Quantum Key Distribution Single photon source Entangled photon Differential Phase Shift Quantum Key Distribution
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