Towards searching for entangled photons in the CMB sky
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PhysRevD.99.023507.pdf
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Author(s)
Chen, Jiunn-Wei
Dai, Shou-Huang
Maity, Debaprasad
Sun, Sichun
Zhang, Yun-Long
Date Issued
January 2019
Journal
Physical Review D
Publisher
American Physical Society
Citation
Chen, Jiunn-Wei et al. "Towards searching for entangled photons in the CMB sky." Physical Review D 99, 2 (January 2019): 023507 © 2019 American Physical Society
Version
Final published version
Abstract
We explore the possibility of detecting entangled photon pairs from cosmic microwave background or other cosmological sources coming from two patches of the sky. The measurements use two detectors with different photon polarizer directions. When two photon sources are separated by a large angle relative to the earth, such that each detector has only one photon source in its field of view, a null test of unentangled photons can be performed. The deviation from this unentangled background is, in principle, the signature of photon entanglement. To confirm whether the deviation is consistent with entangled photons, we derive a photon polarization correlation to compare with, similar to that in a Bell inequality measurement. However, since photon coincidence measurement cannot be used to discriminate unentangled cosmic photons, it is unlikely that the correlation expectation value alone can violate Bell inequality to provide the signature for entanglement.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.99.023507
