- #1
Alex Cros
- 28
- 1
Hello PF!
I was reading
https://en.wikipedia.org/wiki/Fubini–Study_metric (qm section like always )
And can't figure out how to derive:
[tex]\gamma (\psi , \phi) = arccos \sqrt{\frac{<\psi|\phi><\phi|\psi>}{<\psi|\psi><\phi|\phi>}}[/tex]
I started with
[tex]\gamma (\psi , \phi) =|| |\psi> - |\phi>||= \sqrt{(<\psi|-<\phi|)(|\psi>-|\phi>)}=...[/tex]
as it is the distance between the two vectors (no?) but don't seem to get anywhere, help!
NB: I assumed there the vectors are normalized + apologies for the dirac notation format.
Many thanks in advance!
I was reading
https://en.wikipedia.org/wiki/Fubini–Study_metric (qm section like always )
And can't figure out how to derive:
[tex]\gamma (\psi , \phi) = arccos \sqrt{\frac{<\psi|\phi><\phi|\psi>}{<\psi|\psi><\phi|\phi>}}[/tex]
I started with
[tex]\gamma (\psi , \phi) =|| |\psi> - |\phi>||= \sqrt{(<\psi|-<\phi|)(|\psi>-|\phi>)}=...[/tex]
as it is the distance between the two vectors (no?) but don't seem to get anywhere, help!
NB: I assumed there the vectors are normalized + apologies for the dirac notation format.
Many thanks in advance!