He is Professor in Physics at the University of Queensland, and Program Manager in the ARC Centre for Quantum Computer and Communication Technology.
[1] Ralph is known for developing continuous variable quantum cryptography[2] and co-founder of measurement based computation with continuous variable optics.
[3] In 2012, Ralph was one of the scientists responsible for establishing quantum discord as a computational resource.
He has co-authored "A guide to experiments in quantum optics".
His publications include 23 in Physical Review Letters, 6 in the Nature suite of journals, as well as articles in Science and Reviews of Modern Physics.