(December 15, 2021 at 4:44 pm)HappySkeptic Wrote: https://en.wikipedia.org/wiki/No-hiding_theorem
Information is conserved. In fact, one can use rules about information to derive Quantum Mechanics.
One could argue that without "things" there would be no information, but without information, there can be no things. I see information as something just as real as a chair.
A lot of care is required here. The definition of 'information' in quantum systems is very technical and may not agree with intuitions.
Quantum particles have properties (information) encoded in a quantum state. That quantum state can be manipulated in a variety of ways, but because of something called unitarity (which is invertible), it is always theoretically possible to regain state no matter what is done.
That said, the practical ability for recovery is strongly limited by whatever other systems are interacted with. A large, macroscopic, system is very unlikely to be manipulated in giving up the information again (in essence, this is linked with entropy).
So, yes, those properties are 'real' although they may not be specified (for example, in superpositions or entangled states). They may well be probabilistic.