Zero point energy is a simple concept in quantum mechanics. The zero point energy of a system is simply the lowest energy a system can have. This is tied in with things like the Heisenberg uncertainty principle.
An even simpler explanation (or perhaps one which puts it into proper context) should mention absolute zero.
Anything, reduced to absolute zero, should have absolutely no motion. There should be no energy. No motion. No nothing. Basically everything should be completely frozen.
However, due to uncertainty, this is impossible.
If the motion of electrons were stopped, then you could measure their energy and their momentum at the same time and this violates uncertainty.
So. Even at absolute zero, there is some jittery motion going on.
This is zero-point energy.
Right?
Or am I wrong here?
The thing is that absolute zero cannot be reached. Not only due to quantum physics, but also due to classical physics. Thermodynamics would prevent a system from ever reaching absolute zero.
So. No zero-point energy...
That is, unless it is exactly as defined by James and is the lowest energy a system can have. In which case, zero-point energy is achievable above absolute zero temperature?