State and context for an operation acting on a density matrix.

Inherits From: ActOnArgs

To act on this object, directly edit the target_tensor property, which is storing the density matrix of the quantum system with one axis per qubit.



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Adds a measurement result to the log.

key The key the measurement result should be logged under. Note that operations should only store results under keys they have declared in a _measurement_keys_ method.
invert_mask The invert mask for the measurement.