Is the wave function describing reality or does it describe the observers uncertainty about the system? I say that it's real but I would like to hear any comments or evidence that suggest the wave function isn't a description that has a one to one correspondence with a underlying reality. It's like a function that describes a car driving 50 miles an hour for 1 mile. You can predict where the car will be at a half a mile or 3 quarters of a mile. The function describes the underlying reality of the car traveling for 1 mile at 50 MPH. With a quantum system, we can't predict where the particle will be but we can assign probabilities to where the particle might be. The wave function describes an underlying reality where the particle is in a pure quantum state and goes through both slits at the same time to a mixed state where we assign probabilities and the particle has went through one slit or the other and the observer just doesn't know which slit. So why is the function for the car traveling 50 MPH for 1 mile real and the function for the pure or mixed state of the wave function abstract? In other words, when there's a one to one correspondence, how can it be abstract? Here's an article from phys.org: So this is really the crux of the debate. Is randomness inherent in nature or is their some hidden variable or new physics that will do away with this inherent randomness. It goes back to Einstein. So I see think there's a universal wave function in a pure state and when these pure states decohere into mixed states then local universes emerge. So it's like the wave function is the UN and everything from photons, atoms, rocks, trees and human beings are measuring devices that represent the wave function in these local environments. A measuring device like the human brain or a photon can store bits and measure it's environment. So we can reduce classical Shanon entropy to zero. When this occurs we have a now moment for example, turning over a playing card that's face down. I think this speaks to a Quantum mind but that's a topic for another thread. I wanted to hear the evidence that the wave function doesn't correspond to an underlying reality that's inherently random and it's just an abstract description of the observers uncertainty. How can we build quantum computers if superposition isn't an objective reality of the system's wave function?