Been hearing that since a while. But to tell you, there is nothing to worry about it, if it has happened then we're the first one to know it. Even so, it's more of a FUD to make people not buy Bitcoin although quantum computers were already there. In fact, China uses that and other powerful countries for specific innovation but did we hear them cracking down Bitcoin's network and decrypting wallets? no.
I guess you're now confused because the answers are yes and nos here.