Don't reuse the same address for other transactions, so you're much safer when using quantum computers. Nothing is truly secure for asset storage if someone isn't careful. Even if a wallet is sophisticated, if it's not well-secured, it can sometimes be hacked. As far as I know, quantum computers will only record the private key and the public key, so the solution is not to use the same address for multiple transactions. There's been extensive discussion on forums about asset security, and you might want to research the appropriate steps to better understand the best practices.