Relevant results published in the optical field authoritative journal "Optical Express" on.
According to reports, Professor Pan Jianwei and his colleagues Zhang Jun, etc. in the world for the first time 1.25GHz InGaAs / InP single-photon detector monolithic readout circuit, the technology breakthrough can make high-speed quantum communication terminal equipment, the largest proportion of the detector The module size is reduced by more than one order of magnitude, which is estimated to reduce the module size by 20 times compared with the existing high-speed single-photon detector with the same function.
Single-photon detector is the most sensitive instrument for weak light measurement, and has wide application requirements in quantum information, laser radar, etc. The mainstream communication band single-photon detection solutions include up-conversion single photon detector, superconducting nanowire single Photon detector and InGaAs / InP avalanche diode single photon detector.InGaAs / InP single photon detector with low cost, small size, no need for ultra-low temperature refrigeration and other advantages, has been widely used in practical fields such as quantum communication.
In view of the urgent demand for miniaturized quantum communication devices in the future, the size of high-speed single-photon detectors needs to be reduced.Pan Jianwei team further developed a new faint avalanche signal extraction technology and finally developed a 1.25 GHz single photon Detector monolithic integrated readout circuit chip, size 15mm × 15mm.
According to reports, the chip used in the detector system, the performance of the characterization, -50 ℃ detection efficiency of 27.5%, the dark count of 1.2kcps, with board-level integrated readout circuit test results are almost the same, the chip Functional characteristics have been verified.Then the chip for 70 hours of continuity test, the index parameters remain unchanged, the stability of the chip has been verified.
Subsequently, the integration of high-speed single-photon detector and the accessory circuit of the detector system were completed by means of optoelectronic integration technology to finally realize the integrated and integrated micro-high-speed single photon detector module.According to the calculation, Compared with photon detectors, the module can be reduced by 20 times the volume, which provides a strong support for the development of miniaturized quantum communication system.