Could you explain what is the difference between common strong computer and quantum one in numbers?
Hi Permanent_Member! Welcome to the thread :-)
An ordinary computer, even a very powerful one, needs millions of years to crack modern encryption algorithms, such as ECDSA or RSA with a sufficiently long key. A quantum computer, as soon as it has the power of at least 1000 qubits, will be able to do the same in a few seconds.
More details and explaining pictures you can see here:
https://dapcash.org/quantum-apocalypse/