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Obstructions to Bell CMB experiments

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  • Jerome Martin
  • Vincent Vennin
We present a general and systematic study of how a Bell experiment on the cosmic microwave background could be carried out. We introduce different classes of pseudo-spin operators and show that, if the system is placed in a two-mode squeezed state as inflation predicts, they all lead to a violation of the Bell inequality. However, we also discuss the obstacles that one faces in order to realize this program in practice and show that they are probably insurmountable. We suggest alternative methods that could reveal the quantum origin of cosmological structures without relying on Bell experiments.
Original languageEnglish
Article number063501
JournalPhysical Review D
Publication statusPublished - 6 Sep 2017


  • PhysRevD.96.063501

    Rights statement: Jérôme Martin and Vincent Vennin. 'Obstructions to Bell CMB experiments'. Phys. Rev. D 96, 063501. © 2017 American Physical Society. All rights reserved.

    Final published version, 685 KB, PDF-document

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