Experimental Refrence-Frame-Independent Quantum Key Distribution over 250 km of Optical Fiber

• URL: http://arxiv.org/abs/2405.16558v1
• Date: Sun, 26 May 2024 13:08:49 GMT
• Title: Experimental Refrence-Frame-Independent Quantum Key Distribution over 250 km of Optical Fiber
• Authors: Xin Liu, Di Luo, Zhicheng Luo, Shizhuo Li, Zhenrong Zhang, Kejin Wei,
• Abstract summary: We distribute secure key bits over a 250 km optical fiber distance by developing an RFI-QKD system with a repetition rate of 150 MHz. We achieve a finite-key secret key rate of 49.65 bit/s at a distance of 200 km, which is more than three times higher than state-of-the-art systems.
• Score: 9.799109276591071
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: The reference-frame-independent quantum key distribution (RFI-QKD) protocol enables QKD systems to function effectively despite slowly varying reference frames, offering a distinct advantage in practical scenarios, particularly in mobile platforms. In this study, we successfully distribute secure key bits over a 250 km optical fiber distance by developing an RFI-QKD system with a repetition rate of 150 MHz. Benefiting from high repetition rate, we achieve a finite-key secret key rate of 49.65 bit/s at a distance of 200 km, which is more than three times higher than state-of-the-art systems. Our work dramatically extends the transmission distance and enhances the secret key rate of RFI-QKD, significantly promoting its practical application.

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