TY  - JOUR
AU  - Wang, Zhen
AU  - Miki, S.
AU  - Fujiwara, M.
PY  - 2009
DA  - 2009//
TI  - Superconducting nanowire single-photon detectors for quantum information and communications
JO  - IEEE J. Sel. Topics Quantum Electron.
SP  - 1741
EP  - 1747
VL  - 15
IS  - 6
KW  - SSPD
AB  - Superconducting nanowire single-photon detectors (SNSPDs or SSPD) are highly promising devices in the growing field of quantum information and communications technology. We have developed a practical SSPD system with our superconducting thin films and devices fabrication, optical coupling packaging, and cryogenic technology. The SSPD system consists of six-channel SSPD devices and a compact Gifford-McMahon (GM) cryocooler, and can operate continuously on 100 V ac power without the need for any cryogens. The SSPD devices were fabricated from high-quality niobium nitride (NbN) ultrathin films that were epitaxially grown on single-crystal MgO substrates. The packaged SSPD devices were temperature stabilized to 2.96 K ± 10 mK. The system detection efficiency for an SSPD device with an area of 20 × 20 ¿m2 was found to be 2.6% and 4.5% at wavelengths of 1550 and 1310 nm, respectively, at a dark count rate of 100 Hz, and a jitter of 100 ps full-width at half maximum. We also performed ultrafast BB84 quantum key distribution (QKD) field testing and entanglement-based QKD experiments using these SSPD devices.
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ID  - Wang_etal2009
ER  -