Here is more from the excerpt of how this could possibly work:

The energy of the light beams will produce a gravitational field strong enough to drag a spinning neutron through time. Dr. Mallet says: “Let’s say I’ll call the spin up a one (1) and I’ll call a spin down a zero (0). So imagine sending a stream of neutrons with spin up, spin up spin down, spin up …what do you call that? It’s BINARY CODE. So by using the spin of neutrons I can send the binary code which can be translated into a message.”

Here is a bit more on Dr. Ronald Mallett from wikipedia and he is quite an interesting person:

Time travel research

For quite some time^[when?], Ronald Mallett has been working on plans for a time machine. This technology would be based upon a ring laser‘s properties within the context of Einstein’s Theory of Relativity. Mallett first argued that the ring laser would produce a limited amount of frame-dragging which might be measured experimentally, saying:^[4]

“In Einstein’s General Theory of Relativity, both matter and energy can create a gravitational field. This means that the energy of a light beam can produce a gravitational field. My current research considers both the weak and strong gravitational fields produced by a single continuously circulating unidirectional beam of light. In the weak gravitational field of an unidirectional ring laser, it is predicted that a spinning neutral particle, when placed in the ring, is dragged around by the resulting gravitational field.”

I do not know if he is right or not but outside the box thinking is always interesting to read and watch.