Toward a Photonic Demonstration of Device-Independent Quantum Key Distribution

Liu, Wen-Zhao1,2,3,4,5; Zhang, Yu-Zhe1,2,3,4,5; Zhen, Yi-Zheng1,2,3,4,5; Li, Ming-Han1,2,3,4,5; Liu, Yang6; Fan, Jingyun7,8; Xu, Feihu1,2,3,4,5; Zhang, Qiang1,2,3,4,5; Pan, Jian-Wei1,2,3,4,5

2022-07-29

10.1103/PhysRevLett.129.050502

PHYSICAL REVIEW LETTERS   Impact Factor & Quartile

0031-9007

1079-7114

The security of quantum key distribution (QKD) usually relies on that the users' devices are well characterized according to the security models made in the security proofs. In contrast, device-independent QKD - an entanglement-based protocol - permits the security even without any knowledge of the underlying quantum devices. Despite its beauty in theory, device-independent QKD is elusive to realize with current technologies. Especially in photonic implementations, the requirements for detection efficiency are far beyond the performance of any reported device-independent experiments. In this Letter, we report a proof-of-principle experiment of device-independent QKD based on a photonic setup in the asymptotic limit. On the theoretical side, we enhance the loss tolerance for real device imperfections by combining different approaches, namely, random postselection, noisy preprocessing, and developed numerical methods to estimate the key rate via the von Neumann entropy. On the experimental side, we develop a high-quality polarization-entangled photon source achieving a state-of-the-art (heralded) detection efficiency about 87.5%. Although our experiment does not include random basis switching, the achieved efficiency outperforms previous photonic experiments involving loophole-free Bell tests. Together, we show that the measured quantum correlations are strong enough to ensure a positive key rate under the fiber length up to 220 m. Our photonic platform can generate entangled photons at a high rate and in the telecom wavelength, which is desirable for high-speed generation over long distances. The results present an important step toward a full demonstration of photonic device-independent QKD.

SCI ; EI

English

NI Journal Papers

Others

Physics

Physics, Multidisciplinary

WOS:000843085400001

20223312565064

Efficiency ; Numerical methods ; Photonic devices ; Photons ; Quantum entanglement

Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Production Engineering:913.1 ; Numerical Methods:921.6 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

PHYSICS

2-s2.0-85135725803

Web of Science

1.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
2.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
3.Univ Sci & Technol China, CAS Ctr Excellence, Shanghai Branch, Shanghai 201315, Peoples R China
4.Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum Ph, Shanghai 201315, Peoples R China
5.Shanghai Res Ctr Quantum Sci, Shanghai 201315, Peoples R China
6.Jinan Inst Quantum Technol, Jinan 250101, Peoples R China
7.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
8.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

Liu, Wen-Zhao,Zhang, Yu-Zhe,Zhen, Yi-Zheng,et al. Toward a Photonic Demonstration of Device-Independent Quantum Key Distribution[J]. PHYSICAL REVIEW LETTERS,2022,129(5).

Liu, Wen-Zhao.,Zhang, Yu-Zhe.,Zhen, Yi-Zheng.,Li, Ming-Han.,Liu, Yang.,...&Pan, Jian-Wei.(2022).Toward a Photonic Demonstration of Device-Independent Quantum Key Distribution.PHYSICAL REVIEW LETTERS,129(5).

Liu, Wen-Zhao,et al."Toward a Photonic Demonstration of Device-Independent Quantum Key Distribution".PHYSICAL REVIEW LETTERS 129.5(2022).