Quest towards ultimate performance in superconducting nanowire single photon detectors

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（2）
• 页码范围: 80-81
• 页数: 2页
• 语种: 英文

摘要

In 2007,superconducting nanowire single photon detectors (SSPD or SNSPD) [1] made an outstanding impact in the field of quantum information technology by demonstrating quantum key distribution (QKD) over a 200-km optical fiber with a 42-dB optical loss using a practical SNSPD system [2].This successful demonstration was realized thanks to its extremely low dark count rate (DCR) of a few Hz and short timing jitter of 60 ps,while the system detection efficiency (SDE) showed a poor value of 0.7％ at a wavelength of 1550 nm.After-wards,significant efforts have been devoted to the improvement of SDE in practical systems,and remarkable advancements have been continually achieved in the past decade.The SDE of SNSPD is primarily determined by the product of three factors:optical coupling efficiency (ηoc),absorption efficiency (ηabs),and intrinsic detection efficiency (ηint).Therefore,the advancements to increase each factor cumulatively resulted in the improvement of SDE.