> Are there any inherently stable/noise free/non-Volatile Quantum Computing methods, at all? No. With quantum computers, you'd be delighted to have physical qu

> Are there any inherently stable/noise free/non-Volatile Quantum Computing methods, at all? No. With quantum computers, you'd be delighted to have physical qubits where all gate error rates stayed below 1 in a thousand as you scaled up. Finding a qubit with massively better error rates, like one error per million gates, would be tantamount to inventing the quantum transistor. Error correction should be able to reach arbitrarily low error rates. But it has a lot of overhead so, in terms of amount-of-stuff, it'll be more like building your computer out of cogs and gears than like building it out of transistors.