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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Time-tagged coincidence counting unit for large-scale photonic quantum computing

    摘要： Real-time analysis of single-photon coincidence is critical in photonic quantum computing. The large channel number and high counting rate foreseen in such experiments pose a big challenge for the conventional time tagged method and coincidence instruments. Here we propose a real-time time-tagged coincidence method and a data filtering solution, demonstrated by a 32-channel coincidence counting unit that has been implemented successfully on a field-programmable gate array system. The unit provides high counting rates, a tunable coincidence window, and a timing resolution of 390 ps. Beyond that, it is feasible to be scaled up to 104 channels and is thus ideally suited for channel consuming applications such as boson sampling. Based on the versatility and scalability the unit has shown, we believe that it is the turn-key solution for many single-photon coincidence counting applications in photonic quantum computing.

    关键词： boson sampling,FPGA,single-photon coincidence,time-tagged coincidence counting,photonic quantum computing

    更新于2025-09-23 15:21:21

  • SPAD-Based LiDAR Sensor in 0.35 μm Automotive CMOS with Variable Background Light Rejection

    摘要： We present a SPAD-based LiDAR sensor fabricated in an automotive certified 0.35 μm CMOS process. Since reliable sensor operation in high ambient light environment is a crucial factor in automotive applications, four SPADs are implemented in each pixel to suppress ambient light by the detection of photon coincidences. By pixel individual adjustment of the coincidence parameters to the present ambient light condition, an almost constant measurement performance is achieved for a wide range of different target reflectance and ambient illumination levels. This technique allows the acquisition of high dynamic range scenes in a single laser shot. For measurement and demonstration purpose a LiDAR camera with the developed sensor has been built.

    关键词： time-of-flight (TOF),background rejection,single-photon avalanche diode (SPAD),range imaging,light detection and ranging (LiDAR),photon coincidence

    更新于2025-09-04 15:30:14