I was reading a news article saying that bitcoins will not be safe once we have powerful quantum computers. Is there a good alternative way to store bitcoins safely in such a situation ?
There are some solution to this already on the way.
However, if quantum computer can break bitcoin's security, it can also break banking security and etc.
By the time that happens, you'd also be concerned about other things that are put behind some form of encryption that now can be solved by quantum computers.