PhotonIcs and Electromagnetics Research Symposium,
also known as Progress In Electromagnetics Research Symposium
PIERS Proceedings
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Published by The Electromagnetics Academy
Published: 2015-08-28
Detection Loophole-free Entanglement Verification
By
Jian-Wei Pan,
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    Jian-Wei Pan

    University of Science and Technology of China, China

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Luo-Kan Chen,
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    Luo-Kan Chen

    University of Science and Technology of China, China

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Yu-Ao Chen,
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    Yu-Ao Chen

    University of Science and Technology of China, China

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He Lu,
Xiongfeng Ma,
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    Xiongfeng Ma

    Tsinghua University, China

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Ping Xu,
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    Ping Xu

    University of Science and Technology of China, China

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Xing-Can Yao,
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    Xing-Can Yao

    University of Science and Technology of China, China

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Xiao Yuan
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    Xiao Yuan

    Tsinghua University, China

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1730-1734
Abstract
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.
Citation
Jian-Wei Pan, Luo-Kan Chen, Yu-Ao Chen, He Lu, Xiongfeng Ma, Ping Xu, Xing-Can Yao, and Xiao Yuan, "Detection Loophole-free Entanglement Verification," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1730-1734
References

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