My understanding as a non-physicist is that the specific requirement for a warp bubble Alcubierre-style is negative mass. Now this negative mass is theorized to come from some form of exotic matter, which could but doesn’t have to be antimatter. The jury is still out on this one.

As a fan of space travel, it seems the prospect of a warp drive is still not budging much from 0 chance. But that’s okay, we’re also not worse off where we started.