The reporter learned from the University of Science and Technology on the 11th that Professor Pan Jianwei and his colleagues realized important technological breakthroughs in the development of miniaturized quantum communication systems. The related results were published in the optical journal "Optical Express". According to reports, Professor Pan Jianwei and his colleague Zhang Jun have achieved the first 1.25 GHz InGaAs/InP single photon detector monolithic integrated readout circuit in the world. This technology breakthrough can make the largest volume of high-speed quantum communication terminal equipment. Module size is reduced by more than an order of magnitude. It is estimated that the module can be reduced in size by 20 times compared with the existing functional high-speed single photon detector. The single photon detector is the most sensitive instrument for measuring weak light, and has a wide range of application requirements in the fields of quantum information and laser radar. The current mainstream communication band single photon detection solutions include upconversion single photon detectors, superconducting nanowire single photon detectors and InGaAs/InP avalanche diode single photon detectors. The InGaAs/InP single photon detector has the advantages of low cost, small size, and no need for ultra-low temperature refrigeration, and has been widely used in practical quantum communication and other fields. In view of the urgent need for miniaturized quantum communication devices in the future, it is necessary to reduce the volume of high-speed single photon detectors. The Pan Jianwei team further developed a new weak avalanche signal extraction technology, and finally developed a monolithic integrated readout circuit chip of 1.25 GHz single photon detector with a size of 15 mm×15 mm by using low temperature co-fired ceramic technology. According to reports, after the chip is applied to the detector system, the performance is characterized by a detection efficiency of 27.5% and a dark count of 1.2kcps at -50°C, which is almost identical to the test result of the board-integrated readout circuit. Functional features were verified. The chip was then tested for 70 hours of continuity, the index parameters remained unchanged, and the stability of the chip was verified. Then, using the photoelectric integration technology, the high-speed single photon detector integrated component is formed, and combined with the auxiliary circuit of the detector system, the integrated micro-high-speed single photon detector module is finally realized. It is estimated that compared with the existing high-performance single-photon detector with the same function, the module can be reduced by 20 times, which provides a strong support for the development of miniaturized quantum communication systems. (Finish)
Floor heating pipe refers to a pipe used as a circulating flow carrier of low temperature hot water in the ground radiation heating system of low temperature hot water.
Floor heating pipe refers to a pipe used as a circulating flow carrier of low temperature hot water in the ground radiation heating system of low temperature hot water.
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