Heralded Nondestructive Quantum Entangling Gate with Single-Photon Sources

Jin-Peng Li, Xuemei Gu, Jian Qin, Dian Wu, Xiang You, Hui Wang, Christian Schneider, Sven Höfling, Yong-Heng Huo, Chao-Yang Lu, Nai-Le Liu, Li Li, and Jian-Wei Pan
Phys. Rev. Lett. 126, 140501 – Published 5 April 2021
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Abstract

Heralded entangling quantum gates are an essential element for the implementation of large-scale optical quantum computation. Yet, the experimental demonstration of genuine heralded entangling gates with free-flying output photons in linear optical system, was hindered by the intrinsically probabilistic source and double-pair emission in parametric down-conversion. Here, by using an on-demand single-photon source based on a semiconductor quantum dot embedded in a micropillar cavity, we demonstrate a heralded controlled-NOT (CNOT) operation between two single photons for the first time. To characterize the performance of the CNOT gate, we estimate its average quantum gate fidelity of (87.8±1.2)%. As an application, we generated event-ready Bell states with a fidelity of (83.4±2.4)%. Our results are an important step towards the development of photon-photon quantum logic gates.

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  • Received 28 October 2020
  • Accepted 2 March 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.140501

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Jin-Peng Li1,2, Xuemei Gu1,2, Jian Qin1,2, Dian Wu1,2, Xiang You1,2, Hui Wang1,2, Christian Schneider3,4, Sven Höfling2,4, Yong-Heng Huo1,2, Chao-Yang Lu1,2, Nai-Le Liu1,2, Li Li1,2,*, and Jian-Wei Pan1,2

  • 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
  • 3Institute of Physics, Carl von Ossietzky University, 26129 Oldenburg, Germany
  • 4Technische Physik, Physikalische Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

  • *eidos@ustc.edu.cn

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Issue

Vol. 126, Iss. 14 — 9 April 2021

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