It is possible, there are theories about a quantum computer breaking and decoding privatekey through public keys. Though it is far from happening today but it will be a serious threat for BTC security if Bitcoin security features do not improve along the advancement of computers.
Yea but who would have access to quantum computers? They aren't exactly in mass production. A state actor? Is this what OP meant by "somewhere"...?
IBM is making System One now. Governments probably have access to something even stronger.
governments are powerful . they have lots of cash and they can order ready made quantom computers but i dont think that these computers can attack bitcoin via public address . btw is this some kind of a brutforce ? , if yes then they must need some part of the private key or some parts of the users passwords before they can attempt to crack it .
If the government will seriously take part of this they can make it happen, they have all the resources and capabilities so it's better to every bitcoiners
to be well aware on their actions, it's very important to keep being updated and to keep checking the possibilities or how the government is working with this concern.