2014 年 49 巻 8 号 p. 425-432
We present our recent progress in development of a superconducting nanowire single-photon detector (SSPD) system. Our practical SSPD system with a compactGifford-McMahon cryocooler successfully achieved the high system detection efficiency of 74%, low dark count of 100 cps, and small timing jitter of 68 ps in one device simultaneously, which is useful for actual applications. Furthermore, we propose and demonstrate a new strategy to resolve a trade-off problem between the system detection efficiency and counting rate (speed) in the SSPD.