You can see, miners trying to solve complex mathematical problems, and the first one to do so successfully gets to add a new block to the blockchain, earning themselves a reward in the form of new Bitcoins.

Hash you've mentioned with all those leading zeros, it's essentially a representation of the solution the miner has found. For now, as for whether a quantum computer was responsible for finding that hash, I would say it's not necessarily the case.

While it's true that quantum computers are expected to be much more powerful than traditional computers, and they could potentially solve these problems much faster, they're still in the early stages of development, and their practical use in mining is yet to be seen. So, as more miners join the network and the combined computational power increases, the difficulty is adjusted accordingly.