This belongs to the
Development & Technical Discussion.
1.Can we if possible mine more than the specified value of BTC in less than a minute with the help of a powerfully-eligible Quantum Computer?
Unless the computational resources are enough to find an SHA256 collision (such as 64 zeroes), it doesn't matter. The
difficulty is responsible for keeping the block interval at 10 minutes on average whether there are millions of ASICs running or just a GPU.
2.Is it possible to fork Bitcoin and solve the following problems?
Yes. We theoretically can change to a quantum resistant algorithm if it ever becomes needed.
3.How to secure the SHA256 encryption and make it immutable to QC attacks?
SHA256 isn't an encryption scheme. It's just a hash function. The potential threat of quantum computing comes from solving the
ECDLP. In other words, the ability to reverse a public key to private key.