thanks Barry.
Quantum entanglement has been demonstrated over and over again in increasingly sophisticated experiments - latest example is the success of the Google computer. Also, you can buy a commercial comms system with photonic entanglement as the crypto method. Current arguments are not over the efficacy and accuracy of QM in describing how things work, but there are philosophical arguments about what it all means for our view of how the universe is structured (ie how best to interpret QM in a world view) - eg Copenhagen, pilot wave, many worlds etc.
The Google quantum computer is a huge step forward. They did not find any physics that would prevent further expansion of the concepts in their machine and they showed that it could solve a test problem that was right on the edge of what could be done with the best available digital computer. Just to emphasise the enormity of this result, a tiny quantum computer with 53 quantum processing elements is 1000 times faster on a quantum-friendly test task than a supercomputer with ~100,000 state-of-the-art digital processing cores.
Good companions to the Nature article are
https://www.scottaaronson.com/blog/?p=4372 and
https://www.bbc.co.uk/sounds/play/w3csym2f
Cheers Ray