Why are photons ideal carriers of quantum information?

So several quantum systems have been proposed for transmission of quantum information and we know that photon-based quantum technology is one of the best candidates.

I have read some research on integrated waveguide circuits for quantum computing but I have not ran across anything that I could fully understand. So I was wondering if someone could explain to me why optical photon computing quantum circuits are one of our best bets at creating a fully functional quantum computer. Why are photons our best bet?

One of the more interesting papers I have been looking at is:

INTEGRATED WAVEGUIDE CIRCUITS FOR OPTICAL QUANTUM COMPUTING

by M.G. Thomson et al.

If it helps you to better explain to me, I am an electrical engineer and I have taken introductory quantum mechanics at university.

Any input is much appreciated.