A few years ago I actually read through most of the original paper[1], and worked out a lot of the equations.
Although I don't see it mentioned in the article, and I'm speculating here, the reason the approach described in the article might work out for photons is that negative energy has been discovered at the quantum scale in something called the Casimir effect[2]. The Casimir effect happens when you have two conducting plates which are placed very very very close to each other, then in the space between the plates, something which behaves exactly like negative energy exists[3], and it causes an attractive force to be exerted between the two plates.
A natural thing to try would be to harness this type of negative energy to create a tiny warp bubble, and try somehow to stick a quantum particle like a photon in it.
[1] http://arxiv.org/abs/grqc/0009013
[2] http://en.wikipedia.org/wiki/Casimir_effect
[3] http://physics.stackexchange.com/questions/47922/can-negativ...