chanelink logo
CHANELINK
English

Shanghai Microsystems Institute has developed a high-speed photon detector with distinguishable photon numbers

445
2024-07-12 11:14:40
See translation

Recently, Li Hao and You Lixing's team from the Chinese Academy of Sciences Shanghai Institute of Microsystems and Information Technology developed an ultrahigh speed, photon number resolvable optical quantum detector with a maximum count rate of 5GHz and a photon number resolution of 61 by using the sandwich structure superconducting nanowires and multi wires working in parallel. The related research results, titled "Superconducting single photon detector with speed of 5 GHz and photon number resolution of 61", were published online in Photonics Research and were selected for editorial recommendation.

In recent years, superconducting nanowire single photon detectors have been widely used in quantum communication, optical quantum computing, and quantum mechanics principle verification due to their high efficiency, low dark count rate, and excellent time resolution.

The team has developed a highly efficient, ultra high speed, and high photon resolution superconducting detector integrated system. To ensure the portability and reliability of the detection system, the project has built a cooling integrated system based on a GM small refrigeration mechanism. The system supports 64 electrical channels and has a minimum operating temperature of 2.3 K. The detector chip integrates 64 superconducting nanowires on a distributed Bragg reflector, achieving both improved photon absorption and detection speed. After characterization, the yield of nanowire preparation was 61/64, and the system detection efficiency reached 90% at a wavelength of 1550 nm. The maximum counting rate was 5.2 GHz, and the counting rate was 1.7 GHz when the detection efficiency decreased by 3dB. The photon number resolution was 61. The performance indicators of this detection system are expected to support applications such as deep space laser communication, high-speed quantum communication, and basic quantum optical experiments.

The research work was supported by the Science and Technology Innovation 2030 Major Project, the National Natural Science Foundation of China, the Youth Innovation Promotion Association of the Chinese Academy of Sciences, and the "Sailing Plan" of Shanghai.


Device structure (a), superconducting nanowires (b), device packaging (c), and refrigeration system (d)

Source: Shanghai Institute of Microsystems and Information Technology, Chinese Academy of Sciences

Related Recommendations

  • Unsupervised physical neural network empowers stacked imaging denoising algorithm

    In view of the reconstruction problem of stack imaging technology in noisy environment, Lin Nan's team from Shanghai Institute of Optics and Mechanics, Chinese Academy of Sciences, proposed an innovative method ProPtyNet based on unsupervised physical neural network, which is expected to be applied to chip CD measurement and defect detection. The article was published in Optics and lasers in engin...

    03-25
    See translation

  • Coherent CEO Resigns in Restructuring

    Recently, laser giant Coherent (COHR) released an announcement.Coherent Corporation announced that President Walter R. Bashaw II will resign on September 6, 2024, due to a company restructuring that resulted in the cancellation of his position.His resignation is classified as a 'Good Reason' termination, which ensures that he will receive full severance compensation in accordance with existing com...

    2024-08-20
    See translation

  • TAU Systems upgrades the University of Texas desktop laser to a peak power of 40 terawatts

    TAU Systems, a manufacturer of ultra fast compact laser plasma accelerators, announced today that it has successfully upgraded the existing desktop terawatt laser (UT 3) at the University of Texas to a new and improved performance that provides power for compact particle accelerators. The upgraded UT 3 driver laser can now generate ultra short pulses with a peak power of 40 terawatts.This upgrade ...

    2023-08-21
    See translation

  • Assisting Gas Mixing to Promote the Development of Fiber Laser Technology

    Just ten years ago, fiber laser cutting machines were considered experts in thin plates. The stores quickly realized that they had to invest in them to compete, at least by reducing their instrument materials. For high-quality sheet metal cutting, CO2 laser is still the way to go. Of course, fiber lasers can cut thicker blanks, but the quality is not very good, and their speed advantage almost dis...

    2024-01-11
    See translation

  • China University of Science and Technology has made significant progress in the field of pure red perovskite light-emitting diodes

    Recently, four research groups from the University of Science and Technology of China, namely Yao Hongbin, Fan Fengjia, Lin Yue, and Hu Wei, have collaborated to make significant progress in the field of pure red perovskite light-emitting diodes (LEDs). The team independently invented the Electrical Excitation Transient Spectroscopy (EETA) technology and used it to reveal that hole leakage is the ...

    05-12
    See translation