The Counterfactual Property of the Photon

As the title suggests: this is about Quantum Information. It is “Quantum Information Theory” to be more precise. Now physics is sometimes regarded as strange by people who know little about it. And even for people who know a little more about it - well they might regard quantum physics as strange. And even those who know a little about quantum physics - they can regard quantum information theory as rather esoteric. This episode, following Chapter 4 of Chiara Marletto’s excellent book, begins from the ground up to explore how quantum systems can do more with information than classical systems (which is what all present day computers use). There is an excellent talk by David Wallace about the Mach Zehnder interferometer that I mention. It’s here: https://www.youtube.com/watch?v=GRJT9... Coupled with my own remarks about it here: https://www.youtube.com/watch?v=Cu4HH... Anyone should come away with a good understanding of what is actually going on.