Continuous-variable measurement-device-independent quantum key distribution with photon subtraction

Experimental measurement-device-independent quantum key distribution.

Quantum key distribution is proven to offer unconditional security in communication between two remote users with ideal source and detection. Unfortunately, ideal devices never exist in practice and device imperfections have become the targets of various attacks. By developing up-conversion single-photon detectors with high efficiency and low noise, we faithfully demonstrate the measurement-dev...

Non-Gaussian postselection and virtual photon subtraction in continuous-variable quantum key distribution

Zhengyu Li, Yichen Zhang, Xiangyu Wang, Bingjie Xu, Xiang Peng, and Hong Guo1∗ State Key Laboratory of Advanced Optical Communication Systems and Networks, Center for Computational Science & Engineering (CCSE) and Center for Quantum Information Technology, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China Science and Technology on Security Communic...

Measurement-device-independent quantum key distribution with uncharacterized qubit sources

Finite-key analysis for measurement-device-independent quantum key distribution.

Quantum key distribution promises unconditionally secure communications. However, as practical devices tend to deviate from their specifications, the security of some practical systems is no longer valid. In particular, an adversary can exploit imperfect detectors to learn a large part of the secret key, even though the security proof claims otherwise. Recently, a practical approach--measuremen...

Device-independent quantum key distribution

Quantum key distribution allows two parties connected by a quantum channel to establish a secret key that is unknown to any unauthorized third party. The secrecy of this key is based on the laws of quantum physics. For security, however, it is crucial that the honest parties are able to control their physical devices accurately and completely. The goal of device-independent quantum key distribu...