Satoshi Nakamoto built in defenses against quantum computing attacks – If you use one Bitcoin address one time, then your ECDSA public key is only ever revealed at the one time that you spend bitcoins sent to each address. A quantum computer would need to be to break your key in that short time.

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Bitcoin – The Currency of the Internet

#231 Ajay Prakash & Gavin Brennen: Qubit Protocol – Quantum Computing and its Coming Treat to Crypto (letstalk)

With the advent of mature quantum technologies, many of the critical cryptographic protocols which secure the Internet, financial transactions and even military secrets may become susceptible to new attack vectors. For instance, while it may take a computer millions of years to decipher a public key’s corresponding private key, a sufficiently powerful quantum computer might achieve this in a reasonable amount of time. With this reality looming over us, many in the blockchain space worry that…