density matrix

Definition 1.1   A density matrix $ \rho$ is a matrix representing the density operator with the conditions:

  1. The trace of $ \rho$ is $ 1$ .
  2. $ \rho$ is a positive-semidefinite matrix

References

[1] MIT OpenCourseWare, 8.371J Quantum Information Science, Spring 2006.

[2]Blum, Karl, Density Matrix Theory and Applications. 2nd edition Springer, 1996.



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