Because the benefits of quantum computing were so massive
Please elaborate. I’m aware of Grover’s algorithm, Shore’s algorithm, and quantum communication, and it’s not clear that any of these pose a significant threat to even current means of military information security / penetration.
This is an element in the game’s resolution which wasn’t described, so I don’t actually know. If I were to guess based on the level of abstraction used in games like this, it might just be a strong assumption of quantum supremacy that caches out as a series of advantages like:
Your communications are completely secure against any faction which does not also have Quantum Computing.
Your attempts to penetrate the communication of any faction without Quantum Computing are 25% more likely to succeed.
Your available FLOPs increase 25% after Quantum Computing.
I think this reflects the assumptions which underly the game; this is one of the things we would want to be able to vary in order to help with exploring AGI scenarios.
It poses a threat because the military moves much slower than whatever you’re naively assuming is ubiquitious COMSEC. Many CIA assets over the last twenty years, even some today, sent their communiques through channels protected mostly by Quantum-breakable encryption. If China/Russia got a quantum computer now (hell, probably even 15 years from now), it would be almost immediately followed by volleys of executions of our spies.