> there's strong reasons to believe that energy is required to represent all information in the physical universe

You simply do not need to believe this. The universe doesn't need to be "stored" somewhere.

> Quantum Computing is firmly based on pretending that this isn't how it is, that somehow you can squeeze 2^n bits of information out of a system with 'n' parts to it.

Quantum computing does not believe this. It is a theorem that you can only get n bits out of n qubits, and quantum computing speedups do not rely otherwise.

Noise is hard, but error correction is a mathematically sound response.