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Experimental Quantification of Asymmetric Einstein-Podolsky-Rosen Steering

Kai Sun, Xiang-Jun Ye, Jin-Shi Xu, Xiao-Ye Xu, Jian-Shun Tang, Yu-Chun Wu, Jing-Ling Chen, Chuan-Feng Li, and Guang-Can Guo
Phys. Rev. Lett. 116, 160404 – Published 21 April 2016
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Abstract

Einstein-Podolsky-Rosen (EPR) steering describes the ability of one observer to nonlocally “steer” the other observer’s state through local measurements. EPR steering exhibits a unique asymmetric property; i.e., the steerability can differ between observers, which can lead to one-way EPR steering in which only one observer obtains steerability in the steering process. This property is inherently different from the symmetric concepts of entanglement and Bell nonlocality, and it has attracted increasing interest. Here, we experimentally demonstrate asymmetric EPR steering for a class of two-qubit states in the case of two measurement settings. We propose a practical method to quantify the steerability. We then provide a necessary and sufficient condition for EPR steering and clearly demonstrate one-way EPR steering. Our work provides new insight into the fundamental asymmetry of quantum nonlocality and has potential applications in asymmetric quantum information processing.

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  • Received 16 February 2016

DOI:https://doi.org/10.1103/PhysRevLett.116.160404

© 2016 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Synopsis

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One-Way Quantumness

Published 21 April 2016

Experiments provide evidence for one-way quantum steering—an effect by which distant entangled systems can influence one another in a directional way.

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Authors & Affiliations

Kai Sun1,2, Xiang-Jun Ye1,2, Jin-Shi Xu1,2,*, Xiao-Ye Xu1,2, Jian-Shun Tang1,2, Yu-Chun Wu1,2, Jing-Ling Chen3,4,†, Chuan-Feng Li1,2,‡, and Guang-Can Guo1,2

  • 1Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, People’s Republic of China
  • 2Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
  • 3Theoretical Physics Division, Chern Institute of Mathematics, Nankai University, Tianjin, 30071, People’s Republic of China
  • 4Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore, 117543

  • *jsxu@ustc.edu.cn
  • chenjl@nankai.edu.cn
  • cfli@ustc.edu.cn

See Also

Observation of Genuine One-Way Einstein-Podolsky-Rosen Steering

Sabine Wollmann, Nathan Walk, Adam J. Bennet, Howard M. Wiseman, and Geoff J. Pryde
Phys. Rev. Lett. 116, 160403 (2016)

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Vol. 116, Iss. 16 — 22 April 2016

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