Expectation value in terms of density matrix

  • #1
entropy1
Gold Member
1,141
67
It says in Susskind's TM:

##\langle L \rangle = Tr \; \rho L = \sum_{a,a'}L_{a',a} \rho_{a,a'}##

with ##a## the index of a basisvector, ##L## an observable and ##\rho## a density matrix. Is this correct? What about the trace in the third part of this equation?
 

Answers and Replies

  • #2
entropy1
Gold Member
1,141
67
Never mind, I see it now. Thanks.
 

Related Threads on Expectation value in terms of density matrix

Replies
1
Views
2K
Replies
4
Views
1K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
639
  • Last Post
Replies
20
Views
746
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
1
Views
928
  • Last Post
Replies
3
Views
2K
Top