Experimental Measurement-Device-Independent Certification of Non-Entanglement-Breaking Channels
Yingqiu Mao, Yi-Zheng Zhen, Hui Liu, Mi Zou, Qi-jie Tang, Sijie Zhang, Jian Wang, Liang Hao, Weijun Zhang, Hao Li, Lixing You, Zhen Wang, Li Li, Nai-Le Liu, Kai Chen, Teng‐Yun Chen, Jian-Wei Pan · arXiv (Cornell University) · 2019
As a crucial ingredient for quantum information tasks, non-entanglement-breaking (non-EB) channels can maintain entanglement for distributing and storing quantum states. Previous methods to test non-EB channels either require an unjustified assumption of fully trusted measurements, or verify correlations inequivalent to entanglement. Here, we demonstrate a measurement-device-independent certification of non-EB channels based on an improved semi-quantum signaling game, which is robust against loss and detection errors. By using realistic sources and considering flawed state preparation, non-EB regions of decoherence channels and noise channels are unveiled. The results show feasibility of certifying non-EB channels without entangled sources, and can be applied to benchmark functions of practical quantum devices.