Quantum Eraser: do entangled photons arrive at different moments?

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SUMMARY

The discussion centers on the Delayed Choice Quantum Eraser experiment, specifically addressing the timing of entangled photons arriving at detectors A, B, C, or D after reaching the interference screen. Participants inquire about the feasibility of measuring the time interval between the arrival of a photon at the screen and its entangled pair at a detector. The conversation highlights the significance of detector D0 and the coincidence counter circuitry, which are crucial for accurate measurements in this experiment. The referenced paper provides foundational insights into the experimental setup and findings.

PREREQUISITES
  • Understanding of quantum entanglement principles
  • Familiarity with the Delayed Choice Quantum Eraser experiment
  • Knowledge of photon detection methods and timing measurement
  • Basic grasp of interference patterns in quantum mechanics
NEXT STEPS
  • Research the specifics of the Delayed Choice Quantum Eraser experiment
  • Study the role of coincidence counters in quantum experiments
  • Examine the implications of photon timing in quantum mechanics
  • Analyze the findings presented in the paper at https://arxiv.org/abs/quant-ph/9903047
USEFUL FOR

Quantum physicists, researchers in quantum mechanics, and students studying advanced quantum theory will benefit from this discussion, particularly those interested in the nuances of entangled photon behavior and experimental setups.

Leonardo Muzzi
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TL;DR
In a Delayed Choice Quantum Eraser experiment, do we know if paired photons actually arrive at different moments in time?
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Considering a Delayed Choice Quantum Eraser experiment such as the one in the picture above:

It is said that paired photons arriving at the detectors A,B,C,or D, reach the detectors after the entangled pair has reached the interference screen.

Are we actually able to measure the time interval between the photon reaching the screen and its entangled pair reaching one of the detectors? How is this measurement made?

If yes, what is the longest interval ever made between these two events?
 
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The paper describing this experiment is here: https://arxiv.org/abs/quant-ph/9903047

Note the detector D0 and the coincidence counter circuitry. Whoever drew the image you posted left these out either because they didn't understand their importance or in a misguided attempt to simplify the experiment for non-specialists.
 
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