Holistic Quantum Healing can be broken down by each word. Holistic which basically takes into account the entire person as a whole inside and out. Which includes the subconscious and conscious self.
Quantum Healing is based off of Quantum Field which takes into account that we are all energy throughout the universes. This would mean that we are basically one with the universe and should be able to extend and utilize this energy at any given time.
Below is a link to a scientific published abstract on Quantum Field which will look a bit intimidating but it has information and scientific evidence on the Quantum Energy Healing Model.