[petersjt014]

I know these guys understand quantum anything more than I ever will, but is having a larger radix specifically a practical way for increasing performance?

If a binary device has a hardware fault, bits that are in error still have a 50% chance of being correct. It seems like a single component failing here would make this worse (five times worse if it wasn't quantum).

I don't know whether or not the pros outweigh the cons here, or at what radix they do (there's probably some statistical analysis that can answer that), but ten just _seems_ like too much.

[gizmo686]

I am not an expert.

The issue that quantum computers have is not so much that individual qubits get errors, but rather that quibits become entangled with the rest of the universe, erasing our ability to take advantage of any quantom effect. To prevent this, you need to very carefully contain the quibits to prevent them from interacting with anything apart from highly controlled manipulations. The more quibits you have, the harder this becomes. If you can replace this with quidits that have more states, you can do the same computation, while needing fewer particles, making containment easier.

[gaze]

A qudit expands the state space, sure. But now you need universal control over this system so I'm not sure you've bought anything. Also, a system will decay from energy level n to n-1 faster when n is larger... so like eh.

[jdaaph]

quantum algorithms change complexity class. The pro is simply too big if it can work in reality.