Loss tolerance quantum key distribution based on the signal extraction model and advantage distillation technology
Compared with traditional networks, quantum key distribution (QKD) offers the ultimate resources, allowing two remote users to share secret symmetric keys regardless of the capabilities of eavesdroppers. However, the widespread application of commercial QKD is still challenging due to the low photon detection efficiency and the extremely high transmission loss. Here we demonstrate a fully commercial phase-encoding QKD system using a signal extraction model and advantage distillation technology to suppress detector noise and perform real-time pre-error correction. 1.89 × 10<sup>-10</sup> in the asymptotic case and 7.43 × 10<sup>-12</sup> in the nonasymptotic case secret key bits per pulse are achieved with a total loss of 70.05 dB. This method not only increases the transmission loss tolerance but also provides a more realistic deployment of quantum communication.
Authors
- Yu Zhou (ORCID: https://orcid.org/0000-0003-4188-9953)
- Yuyao Guo
- Xiaobin Jiang (ORCID: https://orcid.org/0000-0003-0262-4354)
- Yifei Lu (ORCID: https://orcid.org/0000-0001-8212-0556)
- Jia-Ji Li
- Mu-Sheng Jiang
- Yang Wang (ORCID: https://orcid.org/0000-0001-9774-1064)
- Hailong Zhang (ORCID: https://orcid.org/0000-0003-4101-3943)
- Xiang Wang (ORCID: https://orcid.org/0000-0002-6148-6329)
- Hongwei Li (ORCID: https://orcid.org/0000-0002-7792-8611)
- Wan‐Su Bao
- Chun Zhou
- Linjie Zhou (ORCID: https://orcid.org/0000-0002-1075-7889)
- Yan-Yang Zhou
Institutions
- Shanghai Jiao Tong University (CN)
- State Key Laboratory of Cryptology (CN)
Publication Details
- Journal
- Optics Express
- Published
- 2024-10-18
- DOI
- https://doi.org/10.1364/oe.540592
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Key Research and Development Program of China
- National Safety Academic Fund