As far as I remember, the Ethereum Foundation has a dedicated team researching this (I remain optimistic about this), and I do not think that the progress of quantum computing will pose a crisis to Ethereum in the short term. I have not researched the impact of quantum computing on Ethereum, but I have studied about Bitcoin, so perhaps I can help clarify:
Currently, the most advanced superconducting processors have only hundreds of quantum bits (qubits), and the ultra-low temperature working environment limits the processor size and prevents physical manipulation. Room temperature superconductivity (not yet achieved) will address the existing hardware expansion issues in quantum computing.
Bitcoin’s public key is vulnerable and easily attacked within a time window of approximately 10-60 minutes after a transaction is initiated. Breaking encryption within an hour requires approximately 317 million physical qubits.
Citing “The impact of hardware specifications on reaching quantum advantage in the fault tolerant regime” it states:
"We quantify the number of physical qubits needed to break encryption as a function of code loop time and basic physical error rate. Using surface codes, with a code loop time of 1 microsecond, reaction time of 10 microseconds, and physical gate error rate of 10^-3, breaking encryption within an hour requires approximately 317 million physical qubits.
If the basic physical error rate is a more optimistic value of 10^-4, then breaking encryption within an hour would require 33 million physical qubits. This significant demand for physical qubits implies that the Bitcoin network will not be threatened by quantum computing attacks for many years to come (potentially over a decade)."
Do not let “Vitalik says” become an accomplice to fraud, quantum computing cannot harm Bitcoin, let alone harm the actively innovative Ethereum.