Ex5 4

$\def\abs#1{|#1|}\def\i{\mathbf {i}}\def\ket#1{|{#1}\rangle}\def\bra#1{\langle{#1}|}\def\braket#1#2{\langle{#1}|{#2}\rangle}\def\tr{\mathord{\mbox{tr}}}\mathbf{Exercise\ 5.4}$

Prove that the following are decompositions for some of the standard gates.

(1)
\begin{align} I = K(0)T(0)R(0)T(0) \\ X = -\i T(\pi/2) R(\pi/2) T(0)\\ H = -\i T(\pi/2) R(\pi/4) T(0) \end{align}
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