Detection Loophole-free Entanglement Verification
Quantum entanglement is an essential resource in quantum information processing,which needs to be verified in many tasks such as quantum cryptography and computation.Due to imperfect detection devices when implementing measurements,the conventional entanglement witness method could wrongly conclude a separable state to be entangled.Inspired by the attacks in quantum key distribution,we construct and experimentally realize a time-shift attack on the conventional entanglement witness process.We demonstrate that any separable state can be falsely identified to be entangled.In order to close detection loopholes,we design and experimentally realize a measurement-device-independent entanglement witness for various two-qubit states.We demonstrate that an entanglement witness can be realized without detection loopholes.
Xiao Yuan Ping Xu Luo-Kan Chen He Lu Xing-Can Yao Xiongfeng Ma Yu-Ao Chen Jian-Wei Pan
Center for Quantum Information,Institute for Interdisciplinary Information Sciences Tsinghua Univers Hefei National Laboratory for Physical Sciences at Microscale,Department of Modern Physics Universit
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
1730-1734
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）