High-speed and high-performance polarization-based quantum key distribution system without side channel effects caused by multiple lasers

Heasin Ko; Byung-Seok Choi; Joong-Seon Choe; Kap-Joong Kim; Jong-Hoi Kim; Chun Ju Youn

doi:doi:10.1364/PRJ.6.000214

Photonics Research, 2018, 6 (3): 03000214, Published Online: Jul. 10, 2018

High-speed and high-performance polarization-based quantum key distribution system without side channel effects caused by multiple lasers Download： 527次

Heasin Ko ^1,3Byung-Seok Choi ¹Joong-Seon Choe ¹Kap-Joong Kim ¹Jong-Hoi Kim ¹Chun Ju Youn ^1,2,*

Author Affiliations

¹ Photonic/Wireless Convergence Components Research Division, Electronics and Telecommunications Research Institute, Daejeon 34129, South Korea

² School of Advanced Device Technology, University of Science & Technology, Daejeon 34113, South Korea

³ e-mail: seagod.ko@etri.re.kr

Figures & Tables

Fig. 1. Experimental setup for measuring performance degradation of a polarization-based BB84 QKD system under high DC bias current. An example of aperiodic current signals generated from a FPGA is depicted. FPGA, field-programmable gate array; LD, laser diode; Sync. LD, synchronization laser diode; Sync. PD, synchronization photodiode; DM, dichroic mirror; HWP, half-wave plate; ND filter, neutral density filter; PBS, polarization beam splitter; BS, beam splitter; PD, photodetector; SPD, single photon detector.

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Fig. 2. Detection probability distribution of the received signals under IDC=0.95Ith, which was estimated at the FPGA with a timing resolution of 125 ps. CSE represents the photon counts created by the spontaneous emission process.

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Fig. 3. Side channel effects and the performance of the QKD system under IDC=0. (a) Side channel effects of temporal disparity and intensity fluctuation. Second pulses out of two consecutive pulses in a 1 s time block are measured for different time intervals from 2.5 to 40 ns. Details of the measurement methods are described in [11]. (b) QBER as a function of the signal window with temporal filtering. The signal window was resized from 2.5 to 0.5 ns, with a resolution of 0.25 ns. (c) Sifted key rate and secure key rate as functions of the signal window with temporal filtering.

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Fig. 4. Side channel effects and performance of the QKD system under IDC=0.95Ith. (a) Side channel effects of temporal disparity and intensity fluctuation. Second pulses out of two consecutive pulses in a 1 s time block were measured for different time intervals from 2.5 to 40 ns. Details of the measurement methods are described in [11]. (b) QBER as a function of the signal window with temporal filtering. The signal window was resized from 2.5 to 0.5 ns, with a resolution of 0.25 ns. (c) Sifted key rate and secure key rate as functions of the signal window with temporal filtering.

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Fig. 5. Spectral characteristics of photon pulses for different DC bias and AC pulse conditions.

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Heasin Ko, Byung-Seok Choi, Joong-Seon Choe, Kap-Joong Kim, Jong-Hoi Kim, Chun Ju Youn. High-speed and high-performance polarization-based quantum key distribution system without side channel effects caused by multiple lasers[J]. Photonics Research, 2018, 6(3): 03000214.

High-speed and high-performance polarization-based quantum key distribution system without side channel effects caused by multiple lasers Download： 527次

Fig. 2. Detection probability distribution of the received signals under IDC=0.95Ith, which was estimated at the FPGA with a timing resolution of 125 ps. CSE represents the photon counts created by the spontaneous emission process.

Fig. 5. Spectral characteristics of photon pulses for different DC bias and AC pulse conditions.

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High-speed and high-performance polarization-based quantum key distribution system without side channel effects caused by multiple lasers Download： 527次

Fig. 2. Detection probability distribution of the received signals under IDC=0.95Ith, which was estimated at the FPGA with a timing resolution of 125 ps. CSE represents the photon counts created by the spontaneous emission process.

Fig. 5. Spectral characteristics of photon pulses for different DC bias and AC pulse conditions.

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