- #1

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

Thanks!

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- Thread starter zje
- Start date

- #1

- 16

- 0

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

Thanks!

- #2

Physics Monkey

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Sure, just take the density matrix for the state (up - down).

- #3

tom.stoer

Science Advisor

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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.

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