The secrets of constructing a fusion weapon are some of the most closely guarded secrets humans have ever had.
https://en.wikipedia.org/wiki/History_of_the_Teller%E2%80%93...
Then again, I think all known practical methods of setting off a fusion bomb involve using a fission bomb to do so, so the barrier to entry for even experimentation/development is extremely high.
The secrets of constructing a fusion weapon are some of the most closely guarded secrets humans have ever had.
https://en.wikipedia.org/wiki/History_of_the_Teller%E2%80%93...
Then again, I think all known practical methods of setting off a fusion bomb involve using a fission bomb to do so, so the barrier to entry for even experimentation/development is extremely high.