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학술지
Low-Noise Single-Photon Detector for the 1.5-μm Wavelength Region
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- 저자
- 이승훈, 정규현, 김경헌, 이민희, 안준태, 최상현, 박철우, 박준범, 성문
- 발행일
- 200701
- 출처
- Journal of the Korean Physical Society, v.50 no.1, pp.1-5
- ISSN
- 0374-4884
- 출판사
- 한국물리학회 (KPS)
- 협약과제
- 05MB5200, L+ 밴드대 광증폭기용 광섬유 및 소자 개발, 안준태
- 초록
- This paper describes an experimental demonstration and characterization of a InGaAs avalanchephotodiode (APD)-based low-noise single-photon detector developed for quantum cryptography at a wavelength of 1.5 μm. At the operation temperature of .50 C with a gated Geiger mode, we obtained a quantum efficiency of 21 % with a dark count probability per gate of 2.6 × 10.5 for a gate frequency of 10 kHz. The measured noise equivalent power (NEP) was 8.6 × 10.17 W/Hz1/2, which was the lowest value achieved so far at a thermoelectrically cooled temperature, which is an important factor for low quantum-bit error rates (QBER) in a quantum key distribution (QKD). The afterpulsing probability measured by varying the gate duration and separation indicated that the gate separation should be greater than 40 μs for 2.4-ns gate pulses to avoid the afterpulse effect. The developed single-photon detector turns out to be suitable for a 73-km fiber-optic quantum-key distribution in realistic conditions.덴f
- KSP 제안 키워드
- Bit Error Rate(And BER), Dark count, Fiber optic, Geiger mode, Low noise, Operation temperature, Quantum Efficiency, Quantum bit, Quantum cryptography, Realistic conditions, Single-photon detector