qml.math.convert_to_su4

convert_to_su4(U, return_global_phase=False)

Convert a 4x4 matrix to \(SU(4)\).

Parameters:

• U (array[complex]) – A matrix, presumed to be \(4 \times 4\) and unitary.

• return_global_phase (bool) – If True, the return will include the global phase. If False, only the \(SU(4)\) representation is returned.

Returns:

A \(4 \times 4\) matrix in \(SU(4)\) that is equivalent to U up to a global phase. If return_global_phase=True, a 2-element tuple is returned, with the first element being the \(SU(4)\) equivalent and the second, the global phase.

Return type:

array[complex]

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