Quite frankly, Quantum is probably known or solved by a nation state (probably the United States). Similar to AI, they will release it in a safe roll out (as they deem it).
Maybe, but the AI we see in the mainstream today -- generative image/video/text creations and Large Language Model chatbots -- were done via non-governmental public and private companies. And a lot of the work hitting the scene loudly and somewhat prematurely. My understanding is the amount of and type of compute needed for Quantum is pretty intense, so there'd be a huge footprint from its manufacturing to keep it hidden.