# Expectation value at ground state

1. May 17, 2013

### Roodles01

I realise that at ground state of a harmonic oscillator the energy will be at zero.
I'm assuming that the expectation value will also be at zero.

Could someone confirm this & possibly explain just a little more.
Thank you

2. May 17, 2013

### Staff: Mentor

It is conventional to set the potential energy at equilibrium to zero, which means that the energy of the ground state is not zero, see http://en.wikipedia.org/wiki/Quantum_harmonic_oscillator

Expectation value of what?