Quantum technology will kill Bitcoin; those who express this viewpoint fundamentally do not understand the underlying technology of Bitcoin and cannot establish some logical common sense.
Quantum computing, on the contrary, will make the Bitcoin network stronger. Bitcoin is stored in Bitcoin addresses, and whoever has the corresponding private key can control the Bitcoin in that address, using a method called the ECDSA algorithm.
Google's recently launched Willow has only 105 quantum bits. To crack BTC's ECDSA or SHA-256 within a day, approximately 13 million quantum bits would be needed.
In the predecessor of Willow, Sycamore had 53 physical quantum bits in 2019, and even earlier, the 2016 Foxtail had 22 quantum bits. With such a compounded growth rate, to achieve millions of physical quantum bits in quantum computing will take over 30 years, let alone tens of millions.
Even taking a step back, even if quantum technology develops rapidly, the Bitcoin network has ample time; it only needs to undergo a soft fork upgrade once to easily switch to a quantum-resistant digital signature algorithm, just like the soft fork upgrade in 2021.
From the perspective of mining, as quantum computers become increasingly powerful, they actually serve as a new type of mining machine for mining. Just like the evolution from CPU mining to the current ASIC mining machines. It will only enhance the overall mining power of the Bitcoin network, making the Bitcoin network even more secure and valuable.
