Testing real quantum theory in an optical quantum network

• URL: http://arxiv.org/abs/2111.15128v1
• Date: Tue, 30 Nov 2021 05:09:36 GMT
• Title: Testing real quantum theory in an optical quantum network
• Authors: Zheng-Da Li, Ya-Li Mao, Mirjam Weilenmann, Armin Tavakoli, Hu Chen, Lixin Feng, Sheng-Jun Yang, Marc-Olivier Renou, David Trillo, Thinh P. Le, Nicolas Gisin, Antonio Ac\'in, Miguel Navascu\'es, Zizhu Wang, Jingyun Fan
• Abstract summary: We show that tests in the spirit of a Bell inequality can reveal quantum predictions in entanglement swapping scenarios. We disproving real quantum theory as a universal physical theory.
• Score: 1.6720048283946962
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum theory is commonly formulated in complex Hilbert spaces. However, the question of whether complex numbers need to be given a fundamental role in the theory has been debated since its pioneering days. Recently it has been shown that tests in the spirit of a Bell inequality can reveal quantum predictions in entanglement swapping scenarios that cannot be modelled by the natural real-number analog of standard quantum theory. Here, we tailor such tests for implementation in state-of-the-art photonic systems. We experimentally demonstrate quantum correlations in a network of three parties and two independent EPR sources that violate the constraints of real quantum theory by over $4.5$ standard deviations, hence disproving real quantum theory as a universal physical theory.

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