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Is there any way to obtain the unitary matrix of single way in analytic form?

In numerical form, I could use a workaround like this (i.e. for an X Gate):

>>> from qiskit import QuantumCircuit
>>> qc = QuantumCircuit(1)
>>> qc.x(0)

>>> import qiskit.quantum_info as qi
>>> op = qi.Operator(qc)
>>> print(op.data)
array([[0.+0.j, 1.+0.j],
       [1.+0.j, 0.+0.j]])

But in case of an H gate, it returns this:

array([[ 0.70710678+0.j,  0.70710678+0.j],
       [ 0.70710678+0.j, -0.70710678+0.j]])

Which does not look as nice as... $$ \begin{split}H = \frac{1}{\sqrt{2}} \begin{pmatrix} 1 & 1\\ 1 & -1 \end{pmatrix}\end{split}$$

Is the a way to obtain the operators in this form, from within qiskit?

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1 Answer 1

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I think your best option here is to use array_to_latex from qiskit.visualization module:

from qiskit.visualization import array_to_latex

u = [
    [ 0.70710678+0.j,  0.70710678+0.j],
    [ 0.70710678+0.j, -0.70710678+0.j]
]

array_to_latex(u, prefix='H=')
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