[QIM-1] Create a qml.math.density_matrix for state vectors
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[sc-19608] |
Co-authored-by: Christina Lee <christina@xanadu.ai>
…aneAI/pennylane into density_matrix_from_array
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Quantum Information module PR # 1
Context:
Currently the way to get the (reduced) density matrix from a state vector is a function in the device
default.qubit.Description of the Change:
We add
_density_matrix_from_state_vectorinternal function that takes 1-d tensors for all interfaces as input and returns the density matrix. It also createsstate_to_density_matrixwhich will be the user facing function that accepts state vectors, density matrices and QNodes returning states.We also move the density matrix capabilities for state vector to the
mathmodule.Benefits:
The density matrix capabilities for state vectors are now in the math module and it becomes a function accessible across the whole code base.