4.6 Article

Entangling three identical particles via spatial overlap

期刊

OPTICS EXPRESS
卷 30, 期 17, 页码 30525-30535

出版社

Optica Publishing Group
DOI: 10.1364/OE.460866

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资金

  1. Korea Institute of Science and Technology [2E31021]
  2. MSIP/IITP [2020-0-00947, 2020-0-00972]
  3. National Research Foundation of Korea [2019M3E4A1079777, 2019R1A2C2006381, 2019R1I1A1A01059964, 2021R1C1C1003625]
  4. National Research Foundation of Korea [2019R1I1A1A01059964, 2021R1C1C1003625] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This work proposes schemes to generate two fundamental classes of genuine tripartite entanglement using linear optics and demonstrates their experimental feasibility with three identical photons. The results support the prediction that particle indistinguishability is a fundamental element for entangling identical particles.
Quantum correlations between identical particles are at the heart of quantum technologies. Several studies with two identical particles have shown that the spatial overlap and indistinguishability between the particles are necessary for generating bipartite entanglement. On the other hand, researches on the extension to more than two-particle systems are limited by the practical difficulty to control multiple identical particles in laboratories. In this work, we propose schemes to generate two fundamental classes of genuine tripartite entanglement, i.e., GHZ and W classes, which are experimentally demonstrated using linear optics with three identical photons. We also show that the tripartite entanglement class decays from the genuine entanglement to the full separability as the particles become more distinguishable from each other. Our results support the prediction that particle indistinguishability is a fundamental element for entangling identical particles. (C) 2022 Optics Publishing Group under the terms of the Optica Open Access Publishing Agreement

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