PlanetPhysics/Density Matrix

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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.