QC is unlikely to become practical until it can be practiced at room temperature. This almost surely means abandoning designs based around electrons. Instead, the solutions might lie in the nucleus perhaps related to NMR.

On Thu, Nov 4, 2021, 8:40 PM professor rat <pro2rat@yahoo.com.au> wrote:

The decoherence of quantum bits, or qubits for short, is one of the main hurdles in the construction of practically usable quantum computers.

https://www.miragenews.com/material-for-future-quantum-computers-661583/

Decoherence is a consequence of the unavoidable interaction of virtually all physical systems with their environment.