Countermeasure against probabilistic blinding attack in practical quantum key distribution systems

Qian Yong-Jun^a),^b), Li Hong-Wei†^a),^b),^c), He De-Yong^a),^b), Yin Zhen-Qiang‡^a),^b), Zhang Chun-Mei^a),^b), Chen Wei^a),^b), Wang Shuang^a),^b), Han Zheng-Fu^a),^b)

Schematic program of probabilistic blinding attack. Black solid lines represent the original quantum channel between Alice and Bob; red solid lines represent the eavesdropping channels established by Eve; solid blue line represents the public channel between Alice and Bob; dashed blue line represents that Eve can succeed in listening to the information in the public channel, Alice and Bob are legitimate QKD communicating parties. For the purpose of Alice, Eve plays the role of a fake Bob, while for Bob, Eve plays the role of a fake Alice. Probability control is the control module that determines Eve’s frequency of attacks throughout the communication process, such as a light switch.