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Journal Article
Free-space quantum key distribution transmitter system using WDM filter for channel integration
- Authors
- Minchul Kim, Kyongchun Lim, Joong-Seon Choe, Byung-Seok Choi, Kap-Joong Kim, Ju Hee Baek, Chun Ju Youn
- Issue Date
- 2024-10
- Citation
- ETRI Journal, v.46, no.5, pp.806-816
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원
- Language
- English
- Type
- Journal Article
- Abstract
- In this study, we report a transmitter system for free-space quantum key distribution (QKD) using the BB84 protocol, which does not require an internal alignment process, by using a wavelength-division multiplexing (WDM) filter and polarization-encoding module. With a custom-made WDM filter, the signals required for QKD can be integrated by simply connecting fibers, thus avoiding the laborious internal alignment required for free-space QKD systems using conventional bulk-optic setups. The WDM filter is designed to multiplex the single-mode signals from 785-nm quantum and 1550-nm synchronization channels for spatial-mode matching while maintaining the polarization relations. The measured insertion loss and isolation are 1.8 dB and 32.6 dB for 785 nm and 0.7 dB and 28.3 dB for 1550 nm, respectively. We also evaluate the QKD performance of the proposed system. The sifted key rate and quantum bit error rate are 1.6 Mbps and 0.62%, respectively, at an operating speed of 100 MHz, rendering our system comparable to conventional systems using bulk-optic devices for channel integration.
- KSP Keywords
- 100 MHz, 1550 nm, 5 nm, BB84 protocol, Custom-made, Mode matching(MM), Operating speed, Quantum Key Distribution, Quantum bit error rate(QBER), Single mode, channel integration
This work is distributed under the term of Korea Open Government License (KOGL)
(Type 4: : Type 1 + Commercial Use Prohibition+Change Prohibition)
(Type 4: : Type 1 + Commercial Use Prohibition+Change Prohibition)
