Quantum technology is thriving globally, with quantum communication and quantum computing being highly dependent on cryogenic technology ranging from 1 K to mK. Adopting the pioneering approach of four-stage high-frequency pulse tube coupled by JT cooler, we developed the hybrid cryocooler achieving 1.36 K, which is the lowest temperature ever reached in the world for similar arrangements. It has been verified in the cooling of superconducting nanowire single-photon detectors, one of the core components of the optical quantum computers. We have the production capability of associated cryocooling systems required in optical quantum computing, space quantum communication and deep space exploration.
Following the progress, we further developed the full-technology chain, high cooling capacity mK cryogen-free dilution refrigerator and achieved a no-load temperature of 7 mK and a net cooling capacity of more than 1,200 μW at 100 mK in which the self-developed pre-cooling pulse tube cryocooler with a cooling capacity of more than 2.8 W at 4.2 K is distinctive. This has made important contributions to the development in superconducting quantum computing and fundamental research of quantum properties.
