Experimental Optimal Orienteering via Parallel and Antiparallel Spins

Jun-Feng Tang, Zhibo Hou, Jiangwei Shang, Huangjun Zhu, Guo-Yong Xiang, Chuan-Feng Li, and Guang-Can Guo
Phys. Rev. Lett. 124, 060502 – Published 13 February 2020
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Abstract

Antiparallel spins are superior in orienteering to parallel spins. This intriguing phenomenon is tied to entanglement associated with quantum measurements rather than quantum states. Using photonic systems, we experimentally realize the optimal orienteering protocols based on parallel spins and antiparallel spins, respectively. The optimal entangling measurements for decoding the direction information from parallel spins and antiparallel spins are realized using photonic quantum walks, which is a useful idea that is of wide interest in quantum information processing and foundational studies. Our experiments clearly demonstrate the advantage of antiparallel spins over parallel spins in orienteering. In addition, entangling measurements can extract more information than local measurements even if no entanglement is present in the quantum states.

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  • Received 21 May 2019
  • Accepted 17 January 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.060502

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Jun-Feng Tang1,2,§, Zhibo Hou1,2,§, Jiangwei Shang3,*, Huangjun Zhu4,5,6,7,†, Guo-Yong Xiang1,2,‡, Chuan-Feng Li1,2, and Guang-Can Guo1,2

  • 1Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China
  • 2Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • 3Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement of Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 4Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai 200433, China
  • 5State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
  • 6Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
  • 7Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

  • *jiangwei.shang@bit.edu.cn
  • zhuhuangjun@fudan.edu.cn
  • gyxiang@ustc.edu.cn
  • §These authors contributed equally to this work.

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Vol. 124, Iss. 6 — 14 February 2020

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