Testing real quantum theory in an optical quantum network

分类： 光学 >> 量子光学 提交时间： 2023-02-22

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 Acín Miguel Navascués Zizhu Wang Jingyun Fan

摘要： 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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