4.8 Article

Relativistic Bell Test within Quantum Reference Frames

期刊

PHYSICAL REVIEW LETTERS
卷 126, 期 23, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.230403

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资金

  1. Perimeter Institute for Theoretical Physics
  2. Government of Canada through the Department of Innovation, Science and Economic Development
  3. Province of Ontario through the Ministry of Colleges and Universities
  4. European Commission via Testing the Large-Scale Limit of Quantum Mechanics (TEQ) [766900]
  5. Austrian-Serbian Bilateral Scientific Cooperation [451-03-02141/2017-09/02]
  6. Austrian Science Fund (FWF) through the SFB project BeyondC [F7103-N48, I-2906]
  7. Foundational Questions Institute (FQXi) Fund
  8. John Templeton Foundation, as part of the Quantum Information Structure of Spacetime (QISS) Project [61466]
  9. research platform TURIS

向作者/读者索取更多资源

This study in the field of relativistic quantum information demonstrates that Bell's inequalities can be maximally violated in a special relativistic regime, and the degree of violation is independent of the choice of quantum reference frame. This opens up the possibility of extending entanglement-based quantum communication protocols to relativistic regimes.
A still widely debated question in the field of relativistic quantum information is whether entanglement and the degree of violation of Bell's inequalities for massive relativistic particles are frame independent or not. At the core of this question is the effect that spin gets entangled with the momentum degree of freedom at relativistic velocities. Here, we show that Bell's inequalities for a pair of particles can be maximally violated in a special-relativistic regime, even without any postselection of the momentum of the particles. To this end, we use the methodology of quantum reference frames, which allows us to transform the problem to the rest frame of a particle, whose state can be in a superposition of relativistic momenta from the viewpoint of the laboratory frame. We show that, when the relative motion of two particles is noncollinear, the optimal measurements for violation of Bell's inequalities in the laboratory frame involve coherent Wigner rotations. Moreover, the degree of violation of Bell's inequalities is independent of the choice of the quantum reference frame. Our results open up the possibility of extending entanglement-based quantum communication protocols to relativistic regimes.

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