Hi, I am new to Quantum Mechanics. I had a query and wanted to share with you all. I was recently studying the subject of quantum barrier tunneling. It says there is always some probability for electron to pass a potential barrier even though it doesn't have sufficient energy to cross the potential barrier. The more interesting thing about this is that the energy of electron after crossing the barrier remains same. I doubt it. Look think it in this way that its possible for the electron to travel half the barrier and then cross it. Then it would have less energy after crossing the barrier. But to my knowledge nobody had seen it though. What might be the reason that such phenomenon don't occur?