To fill in another important detail that will be important later, I added a short section to the end of my article about quantum tunneling. Specifically, suppose you have an electron, placed in one of two traps, such that the electron can tunnel from one trap to the other. What happens if one of the traps is deeper than the second?
This difference between the traps leads to a bias — the electron tends to end up in the deeper trap, because it is harder for it to tunnel back to the shallow trap than it is to tunnel into the deeper one. This simple fact has implications for the entire universe, as I’ll describe in a few days.