- #1

- 488

- 4

[tex]\rho_{12} = |2\rangle\langle 1|[/tex]

and

[tex]\rho_{21} = |1\rangle\langle 2|[/tex]

?

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- Thread starter KFC
- Start date

- #1

- 488

- 4

[tex]\rho_{12} = |2\rangle\langle 1|[/tex]

and

[tex]\rho_{21} = |1\rangle\langle 2|[/tex]

?

- #2

Gold Member

- 938

- 54

(a|0> + b|1>)(a*<0| + b*<1|)

with a off diagonal part ab*|0><1|

the off diagonal matrix element is ab* = <f |0><1|f> (with |0> and |1> orthogonal)

With a mixture of pure state f1,f2 with probabilities p1, p2

we get p1<f1 |0><1|f1> + p2<f2 |0><1|f2>

I hope there is no error in my answer!

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