Optimizing the DCQE: BBO Placement and its Impact on Experiment Results

[San K]

In the DCQE such as the one referenced below:

1. The beta barium borate crystal (labeled as BBO) is placed after the double slit

Would the experiment still be the same if we place the BBO before the double slit and have the "signal" photon then proceed directly to Do without having to go through the slits.

the idler photon can however go through the slits.

Reference:

in the delayed choice quantum eraser, first performed by Yoon-Ho Kim, R. Yu, S.P. Kulik, Y.H. Shih, and Marlan O. Scully,[1]

http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser

 

[eljose79]

I would like to clarify that the placement of the beta barium borate (BBO) crystal in the DCQE experiment does not affect the fundamental principles of the experiment. The BBO crystal is used to generate entangled photon pairs, which are then split and sent through the double slits. The purpose of the BBO crystal is to create a quantum entanglement between the signal and idler photons, not to affect the behavior of the photons themselves.

Therefore, the experiment would still produce the same results if the BBO crystal is placed before or after the double slit. The key factor in this experiment is the entanglement between the photons, not the placement of the BBO crystal.

That being said, altering the placement of the BBO crystal may affect the practical aspects of the experiment, such as the intensity of the signal and idler photons. This may impact the ability to observe the interference patterns at the detector, but it does not change the underlying principles of the experiment.

In conclusion, the DCQE experiment would still yield the same results if the BBO crystal is placed before or after the double slit, as long as the entanglement between the photons is maintained. The placement of the BBO crystal does not change the fundamental principles of the experiment.