The ‘Delayed Choice Quantum Eraser’ Neither Erases Nor Delays

@article{Kastner2019TheC,
  title={The ‘Delayed Choice Quantum Eraser’ Neither Erases Nor Delays},
  author={Ruth E. Kastner},
  journal={Foundations of Physics},
  year={2019},
  pages={1-11}
}
  • R. Kastner
  • Published 8 May 2019
  • Physics
  • Foundations of Physics
It is demonstrated that ‘quantum eraser’ (QE) experiments do not erase any information. Nor do they demonstrate ‘temporal nonlocality’ in their ‘delayed choice’ form, beyond standard EPR correlations. It is shown that the erroneous erasure claims arise from assuming that the improper mixed state of the signal photon physically prefers either the ‘which way’ or ‘both ways’ basis, when no such preference is warranted. The latter point is illustrated through comparison of the QE spatial state… 

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