PlanetPhysics/Density Matrix

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A density matrix $\rho$ is a [[../Matrix/|matrix]] representing the density [[../QuantumOperatorAlgebra4/|operator]] with the conditions:

1. The [[../Trace/|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.