The entire world is quantum. The quantum world is everywhere. The Classical physics world is just another name for a first approximation of the quantum physics world, a first approximation of the collapse of the wavefunction of a quantum totality. What physics loses is scale. No longer is there a small scale different from a large scale.
Scale is all the same since everything is atoms.
Everything is atomic scale. The microscope of biology is measuring the same as the telescope of astronomy. Spooky action at a distance where a measurement in one part of an experiment instantaneously changes the measurement in another part even though the two parts are at opposite ends of the observable universe. This is Bell's inequality with Aspect's experimental confirmation of quantum mechanics. Bell's inequality distinguishes between Classical physics and Quantum physics on the large scale.