| Autor: |
Xin-Yang Zheng, Jin Lin, Yu-Huai Li, Min-Yan Wang, Sheng-Kai Liao, Cheng-Zhi Peng |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
AIP Advances, Vol 14, Iss 6, Pp 065120-065120-10 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2158-3226 |
| DOI: |
10.1063/5.0206186 |
| Popis: |
The Twin-Field Quantum Key Distribution (TF-QKD) protocol has the potential to realize secure key distribution over extremely long distances, which is an important technique for realizing a global quantum network. Compared to the conventional BB84 protocol, practical TF-QKD and its variant protocols require an accurate phase modulation to at least 16 different values with randomized encoding. In this work, we developed an encoding control system for TF-QKD. Optical pulses with five different intensities and 16 different phases can be modulated with a clock frequency of 100 MHz with a field programmable gate array based arbitrary waveform generator (AWG). With the assistance of DDR4 memory, waveforms exceeding 200 ms in length can be output simultaneously on 4 pairs of differential channels, making the random number pairing between two different encoding systems close to the expected ratio when using cyclic random numbers for experimental demonstration. The AWG boasts a long-term amplitude stability better than 0.03% and supports seamless concatenation and cyclic output of waveforms, demonstrating a strong and sustained performance in long-duration experiments. Sending-or-not-sending TF-QKD was demonstrated with the encoding control system, with a secure key rate of 1.33 × 10−5 per pulse under the total channel loss of ∼32 dB. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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