Experimental Test of Leggett's Inequalities with Solid-State Spins

ORAL

Abstract

Bell's theorem states that no local hidden variable model is compatible with quantum mechanics. Surprisingly, even if we release the locality constraint, certain nonlocal hidden variable models, such as the one proposed by Leggett, may still be at variance with the predictions of quantum physics. Here, we report an experimental test of Leggett's nonlocal model with solid-state spins in a diamond nitrogen-vacancy center. We entangle an electron spin with a surrounding weakly coupled 13C nuclear spin and observe that the entangled states violate Leggett-type inequalities by more than 6.4 and 10.1 standard deviations for six and eight measurement settings, respectively. Our experiment results are in full agreement with quantum predictions and render Leggett's nonlocal hidden variable model disputable with a high level of confidence.

Presenters

  • Xianzhi Huang

    • Tsinghua University
    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China
    • Center for Quantum Information, IIIS, Tsinghua University

Authors

  • Xianzhi Huang

    • Tsinghua University
    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China
    • Center for Quantum Information, IIIS, Tsinghua University

  • Xiaolong Ouyang

    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China
    • Center for Quantum Information, IIIS, Tsinghua University

  • Wengang Zhang

    • Tsinghua University
    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China
    • Center for Quantum Information, IIIS, Tsinghua University

  • Xin Wang

    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China
    • Center for Quantum Information, IIIS, Tsinghua University

  • Huili Zhang

    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China

  • Yefei Yu

    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China

  • Dongling Deng

    • Tsinghua University
    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China

  • Luming Duan

    • Center for Quantum Information , IIIS, Tsinghua University
    • Tsinghua University
    • Institute for Interdisciplinary Information Sciences, Tsinghua University
    • Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, P. R. China
    • Center for Quantum Information, IIIS, Tsinghua University
    • Center for Quantum Information, Tsinghua University