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The fast development of superconducting nanowire single photon detector(SNSPD) in the past decade has enabled many advances in quantum informationtechnology. The best system detection efficiency (SDE) record at 1550 nmwavelength was 93% obtained from SNSPD made of amorphous WSi which usuallyoperated at sub-kelvin temperatures. We first demonstrate SNSPD made ofpolycrystalline NbN with SDE of 90.2% for 1550 nm wavelength at 2.1K,accessible with a compact cryocooler. The SDE saturated to 92.1% when thetemperature was lowered to 1.8K. The results lighten the practical and highperformance SNSPD to quantum information and other high-end applications.

NbN superconducting nanowire single photon detector with efficiency over 90% at 1550 nm wavelength operational at compact cryocooler temperature