qml.labs.trotter_error.generic_fragments

generic_fragments(fragments, norm_fn=None)

Instantiates GenericFragment objects.

Parameters:

• fragments (Sequence[Any]) – A sequence of objects of the same type. The type is assumed to implement __add__, __mul__, and __matmul__.

• norm_fn (Callable) – A function that computes the norm of the fragments.

Returns:

A list of GenericFragment objects instantiated from fragments.

Return type:

List[GenericFragment]

Example

This code example demonstrates building fragments from numpy matrices.

>>> from pennylane.labs.trotter_error import generic_fragments
>>> import numpy as np
>>> matrices = [np.array([[1, 0], [0, 1]]), np.array([[0, 1], [1, 0]])]
>>> fragments = generic_fragments(matrices, norm_fn=np.linalg.norm)
>>> fragments
[GenericFragment(type=<class 'numpy.ndarray'>), GenericFragment(type=<class 'numpy.ndarray'>)]
>>> fragments[0].norm()
1.4142135623730951

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