Abstract:

In the beginning of this century, a new type of detector, superconducting nanowire single photon detector (SNSPD) joined the family of superconducting sensors and detectors. Soon, it has been turning to be one of the most important players in this family since it surpasses the semiconducting single photon detectors (APD: avalanche photodiode and PMT: photo multiplier tube) with many advantages, such as high detection efficiency, low dark count rate, low timing jitter and higher counting speed. Now you may buy the commercial SNSPDs including the cryogenic system from a few start-up companies in the world. Many interesting applications and demonstrations of SNSPDs has been demonstrated in past a few years.

In this talk, I will introduce our work on SNSPD and its applications including quantum information in SIMIT, CAS.

(i) High detection efficiency SNSPD for the fiber communication wavelength of 1550 nm;

(ii) High detection efficiency SNSPD for wavelengths from the visible to near infrared;

(iii) How to reduce the dark count rate of SNSPD by the on-chip film narrow-bandpass filter;

(iv) How to realize SNSPD with high polarization extinction ratio;

(v) Demonstration of SNSPD applications.