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I am reading an introduction on trapping atoms in space with magnetic potential. The article said the lab usually use a harmonic potential to trap the atoms and the potentials is in the form

##\dfrac{m}{2}(\omega_x^2x^2 + \omega_y^2y^2 + \omega_z^2z^2)##

and ##\omega_{x,y,z}## has the unit of frequency. I wonder how do you understand the frequency in the potential from physical point of view. Why there is frequency?