It seems like IBM has also achieved a similar milestone. Read the news below,

https://www.cnet.com/news/ibm-new-53-qubit-quantum-computer-is-its-biggest-yet/

Bitcoin is protected by 256 bit encrypted architecture so I don't see any rrason to worry right at this moment. Even if 256 qubit is achieved by 2022, not necessarily bitcoin will be their target!

BTW, what is Lantern signature? I am clueless about it and also didn't get any details through Google! Can you please explain?