Entangling three identical particles via spatial overlap

Author:

Lee Donghwa12,Pramanik Tanumoy1ORCID,Hong Seongjin1,Cho Young-Wook13,Lim Hyang-Tag12,Chin Seungbeom45,Kim Yong-Su12ORCID

Affiliation:

1. Korea Institute of Science and Technology (KIST)

2. Korea University of Science and Technology

3. Yonsei University

4. Sungkyunkwan University

5. University of Gdánsk

Abstract

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.

Funder

Korea Institute of Science and Technology

MSIP/IITP

National Research Foundation of Korea

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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