Negative off-diagonal elements in density matrix?

  • Thread starter zje
  • Start date
  • #1
zje
16
0
I have a quick question. I've been trying to search for an answer, but I'm probably looking in the wrong places.

Is it valid to have negative off-diagonal elements in a density matrix?

Thanks!
 

Answers and Replies

  • #2
Physics Monkey
Science Advisor
Homework Helper
1,363
34
Sure, just take the density matrix for the state (up - down).
 
  • #3
tom.stoer
Science Advisor
5,766
162
Of course.

In diagonal form you can interpret the diagonal elements as probabilities. But in addition you know that all symmetric matrices can be diagonalized via a unitary transformation.
 

Related Threads on Negative off-diagonal elements in density matrix?

  • Last Post
Replies
2
Views
5K
Replies
1
Views
320
Replies
1
Views
3K
Replies
4
Views
4K
  • Last Post
Replies
3
Views
7K
Replies
2
Views
17K
Replies
2
Views
2K
Replies
1
Views
863
Replies
6
Views
4K
Top