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We perform a proof-of-principle demonstration of the measurement-device-independent quantum key distribution (MDI-QKD) protocol using weak coherent states and polarization-encoded qubits over two optical fiber links of 8.5 km each. Each…

We demonstrate the first implementation of polarization encoding measurement-device-independent quantum key distribution (MDI-QKD), which is immune to all detector side-channel attacks. Active phase randomization of each individual pulse is…

量子物理 · 物理学 2014-05-21 Zhiyuan Tang , Zhongfa Liao , Feihu Xu , Bing Qi , Li Qian , Hoi-Kwong Lo

Measurement-device-independent quantum key distribution (MDI-QKD) is proved to be able to eliminate all potential detector side channel attacks. Combining with the reference frame independent (RFI) scheme, the complexity of practical system…

量子物理 · 物理学 2018-11-12 Hongwei Liu , Jipeng Wang , Haiqiang Ma , Shihai Sun

Quantum key distribution (QKD) is a cryptographic protocol to enable two parties to share a secure key string, which can be used in one-time pad cryptosystem. There has been an ongoing surge of interest in implementing long-haul…

量子物理 · 物理学 2022-08-22 Sourav Chatterjee , Kaumudibikash Goswami , Rishab Chatterjee , Urbasi Sinha

Measurement-device-independent quantum key distribution (MDI-QKD) protocol was proposed to remove all the detector side channel attacks, while its security relies on the trusted encoding systems. Here we propose a one-sided MDI-QKD…

量子物理 · 物理学 2018-01-18 Wen-Fei Cao , Yi-Zheng Zhen , Yu-Lin Zheng , Li Li , Zeng-Bing Chen , Nai-Le Liu , Kai Chen

Standard quantum key distribution (QKD) protocols typically assume that the distant parties share a common reference frame. In practice, however, establishing and maintaining a good alignment between distant observers is rarely a trivial…

量子物理 · 物理学 2014-04-04 Joshua A. Slater , Cyril Branciard , Nicolas Brunner , Wolfgang Tittel

Measurement-device-independent quantum key distribution (MDI-QKD) is immune to all security loopholes on detection. Previous experiments on MDI-QKD required spatially separated signal lasers and complicated stabilization systems. In this…

量子物理 · 物理学 2016-09-30 Guang-Zhao Tang , Shi-Hai Sun , Feihu Xu , Huan Chen , Chun-Yan Li , Lin-Mei Liang

Measurement-device-independent quantum key distribution (MDI-QKD) closes all the security loopholes in the detection system and is a promising solution for secret key sharing. Polarization encoding is the most common QKD encoding scheme, as…

量子物理 · 物理学 2024-08-14 Olinka Bedroya , Chenyang Li , Wenyuan Wang , Jianyong Hu , Hoi-Kwong Lo , Li Qian

While measurement-device-independent (MDI) quantum key distribution (QKD) allows two trusted parties to establish a shared secret key from a distance without needing to trust a central detection node, their quantum sources must be…

量子物理 · 物理学 2023-01-04 J. Eli Bourassa , Amita Gnanapandithan , Li Qian , Hoi-Kwong Lo

Real-world BB84 Quantum Key Distribution (QKD) systems utilize imperfect devices that introduce vulnerabilities to their security, known as side-channel attacks. Measurement-Device-Independent (MDI) QKD authorizes an untrusted third party…

量子物理 · 物理学 2023-11-09 Kazi Reaz , Md Mehdi Hassan , Adrien Green , Noah Crum , George Siopsis

Measurement-device-independent quantum key distribution (MDI-QKD) removes all detector side channels and enables secure QKD with an untrusted relay. It is suitable for building a star-type quantum access network, where the complicated and…

Measurement-device-independent quantum key distribution (MDI-QKD) was originally proposed as a means to address the issue of detector side-channel attacks and enable finite secure key rates over longer distances. However, the asymmetric…

量子物理 · 物理学 2026-02-18 Nilesh Sharma , Shashank Kumar Ranu , Prabha Mandayam , Anil Prabhakar

Measurement-device-independent quantum key distribution (MDI-QKD) eliminates detector side-channel attacks by relocating all measurements to an untrusted intermediate node. However, its practical implementation critically relies on…

量子物理 · 物理学 2025-12-22 A. P. Pljonkin

The security of measurement device-independent quantum key distribution (MDI QKD) relies on a thorough characterization of one's optical source output, especially any noise in the state preparation process. Here, we provide an extension of…

We show how weak non-linearities can be used in a device-independent quantum key distribution (QKD) protocol using generalized two-mode Schr\"odinger cat states. The QKD protocol is therefore shown to be secure against collective attacks…

量子物理 · 物理学 2015-08-12 Curtis J. Broadbent , Kevin Marshall , Christian Weedbrook , John C. Howell

Measurement-device-independent quantum key distribution (MDI-QKD) can eliminate detector side channels and prevent all attacks on detectors. The future of MDI-QKD is a quantum network that provides service to many users over untrusted relay…

量子物理 · 物理学 2019-10-23 Wenyuan Wang , Feihu Xu , Hoi-Kwong Lo

Quantum key distribution(QKD) allows the legitimate partner to establish a secret key whose security only depends on physical laws. In recent years, research on QKD by employing insecure measurement devices, namely…

量子物理 · 物理学 2023-07-04 Hao Shu

Quantum key distribution (QKD) offers information-theoretic security based on the fundamental laws of physics. However, device imperfections, such as those in active modulators, may introduce side-channel leakage, thus compromising…

量子物理 · 物理学 2023-05-10 Chengqiu Hu , Wenyuan Wang , Kai-Sum Chan , Zhenghan Yuan , Hoi-Kwong Lo

Atmospheric turbulence poses a significant challenge to free-space measurement-device-independent quantum key distribution (FSO MDI-QKD) by inducing polarization decoherence and depolarization, which degrade the secret key rate (SKR). In…

量子物理 · 物理学 2025-09-03 Heyang Peng , Seid Koudia , Symeon Chatzinotas

Quantum Key Distribution (QKD) relies on quantum communication to allow distant parties to share a secure cryptographic key. Widespread adoption of QKD in current telecommunication networks will require the development of simple, low cost…

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