# Are there any measure of overlap of two wave functions other than inner product?

The similarity of two wave functions is usually measured by the inner product $\langle \psi_1 | \psi_2 \rangle$.

There is a fancier way to measure distance between two density operators, namely, Bures metric.

Are there any other metrics to measure wave function distances?

• – The Photon Apr 6 '17 at 22:18
• Thanks! There are numerous ways to define inner product, but do they have physical significance? – Machine Apr 7 '17 at 15:49