Creating quantum-resistant crypto algorithm is very easy: all algorithms are quantum-resistant. All of them. Quantum computing is, and will always be slower than classical one. All quantum computers are noise-generators, and can only be superior in generating garbage. Of course for some applications tons of noise is beneficial, but not for solving ECDLP or reversing SHA256.

It is very easy to see it: somewhere halfway through solving the problem, the magical qubits have to represent a whooping 2²⁵⁶ bits of information. Then a single neutrino passes through and all is gone, the information is disrupted. And neutrinos pass all the time in large quantity. And not only neutrinos.

The word "quantum" in many cases is equivalent to "scam". So is any "scam computer" a threat to bitcoin?