Quantum circuits aren’t general-purpose computers—they’re added to conventional computers to allow them to perform a small handful of algorithms more efficiently. I don’t believe any of those algorithms would benefit the basic features of an operating system enough that it would make sense to modify an OS to require the use of one.

(Although I could totally see Microsoft doing something like only licensing their circuit’s drivers to run on Windows.)

I think quantum computers may be impossible. But if they are possible, they will be a USB/PCIe accessory that works alongside an ordinary processor running an ordinary operating system.

I expect Linux will have a driver for quantum computers before Windows.

This is not how this works. One day in the future, when quantum computers have matured enough to do something actually useful instead of just quantum benchmarks, they still will not be general purpose systems.

The situation will be more like video cards at the moment: it would be a subsystem doing something very specialized and limited, being controlled by a driver handing over certain jobs from the OS of the real processor.

*nix for sure. No way MS will develop a quantum OS before a *nix variant is out

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Honestly neither since we won’t have that in a PC sized containment for decades or ever.

Quantum computing is a pipe dream, it’s never going to happen.