Please drive carefully: scientists plan to transport volatile antimatter for first time
(www.theguardian.com)
This is old, but you get the idea. See section 3.5.
https://arxiv.org/abs/physics/0510071
EDIT: I'm getting bullshit downvotes from people who clearly won't read the paper and don't understand the proposed detonation model. One need not have grams of antimatter to trigger a H-H fusion detonation. A relatively small amount of antimatter is needed to trigger initial fusion of a hydrogen target, which by cascade can be used to detonate additional hydrogen. This removes the fission trigger and allows for very small fusion weapons with relatively low yields. For example, a device the size of a hand grenade with tons of TNT equivalent output - like a truck bomb in your hand. Or a rifle sized X-Ray laser is another proposed weapon.
Read the study. This technology is feasible.