Science has not proved and cannot prove that Quantum Entanglement is a real phenomenon, because it cannot be measured: as soon as one measures the particles, the entanglement is destroyed.
Furthermore, science has not proved that quantum entanglement is particles linked or particles created symmetrically. For all we know, entangled particles may be born in symmetrical state and not be linked at all.
Thirdly, we haven't even proved that a single photon is a wave. We have shown that a stream of light particles acts as a wave, through the double slit experiment, but not an individual photon.
We also have not proved that the interference pattern we are seeing in the double slit experiment is not due to spacetime ripples that create certain paths for photons to travel to instead of photons being waves.
In the double slit experiment, if the slits are turned sideways or become circular or rectangular, the interference pattern on the projector changes accordingly.
However, if the slits are enlarged, the interference pattern ceases.
This means that what actually happens is that there is a collision of photons with the slits, when the slits are small enough. When the slits are enlarged, there is no collision, and therefore no interference pattern.
When we put a detector between the electron/photon gun and the slits, the electron/photon emitted by the gun is absorbed by the detector and reemmited from the other side of the detector in a straight line, because the detector and the slits form a straight geodesic line, and thus the emitted electron/photon goes straight through the slit and does not collide with the slit walls.
I bet that if the detector is placed right where the opening hole of the electron/photon gun is, and the slits are moved slowly away from the detector, the interference pattern will reemerge, showing that there is no wave function to collapse, and thus proving that QM is the best error mankind ever did.