Experimental Three-State Measurement-Device-Independent Quantum Key Distribution with Uncharacterized Sources

• URL: http://arxiv.org/abs/2002.04944v1
• Date: Wed, 12 Feb 2020 12:24:05 GMT
• Title: Experimental Three-State Measurement-Device-Independent Quantum Key Distribution with Uncharacterized Sources
• Authors: Xing-Yu Zhou, Hua-Jian Ding, Chun-Hui Zhang, Jian Li, Chun-Mei Zhang and Qin Wang
• Abstract summary: We investigate uncharacterized MDI-QKD by utilizing a three-state method. The only requirement for state preparation is that the state are prepared in a bidimensional Hilbert space. A proof-of-principle demonstration over a 170 km transmission distance is achieved.
• Score: 11.032286575112511
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The measurement-device-independent quantum key distribution (MDI-QKD) protocol plays an important role in quantum communications due to its high level of security and practicability. It can be immune to all side-channel attacks directed on the detecting devices. However, the protocol still contains strict requirements during state preparation in most existing MDI-QKD schemes, e.g., perfect state preparation or perfectly characterized sources, which are very hard to realize in practice. In this letter, we investigate uncharacterized MDI-QKD by utilizing a three-state method, greatly reducing the finite-size effect. The only requirement for state preparation is that the state are prepared in a bidimensional Hilbert space. Furthermore, a proof-of-principle demonstration over a 170 km transmission distance is achieved, representing the longest transmission distance under the same security level on record.

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