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Towards searching for entangled photons in the CMB sky with Bell Inequality

SourceSeminar Date of Publication:Oct 27,2022
10/27 2022 Seminar
  • Title Towards searching for entangled photons in the CMB sky with Bell Inequality
  • Speaker 张云龙(中科院国家天文台)
  • Date 2022年10月27日 10:30
  • Venue 理论所南楼6420 Join Zoom Meeting https://zoom.us/j/83722794090?pwd=UVh1dWJHd1AyV3NFNmlHMkNZOTYydz09 Meeting ID: 837 2279 4090 Passcode: 222234
  • Abstract

      
    We explore the possibility of detecting entangled photon pairs from two patches of the sky, such as cosmic microwave background or other cosmological sources. The measurements use two detectors with different photon polarizer directions. When two photon sources are separated by a large angle, a null test of unentangled photons can be performed. The deviation from this unentangled background is the signature of photon entanglement. To confirm whether the deviation is consistent with entangled photons, we derive the photon polarization correlation to compare with, similar to that in a Bell inequality measurement. Besides, with the use of holographic Schwinger–Keldysh correlators, we construct the CHSH (Clauser–Horne–Shimony–Holt) form of Bell inequality, and find that its violation can also be implemented in the holographic model of EPR (Einstein–Podolsky–Rosen) pair.
      

      

     

    Contact Wang Shaojiang