Made changes to improve operators tutorial

Guillermo-Mijares-Vilarino commented 2 years ago

Summary

Made some changes to the Summary of Quantum Operations tutorial to make it follow more closely our documentation checklist and guidelines.

Details and comments

Moved imports to where they are strictly needed so the users can better understand what imports are needed for each step.
Corrected the controlled-$u$ matrix form.
Added matrices for most significant bit controlled Hadamard, Rz, U, Toffoli and Fredkin gates for more Physics-oriented users and consistency with most sources.
Explained what phase and Pauli gates meant in terms of rotation on the Bloch sphere.
Mentioned where each simulator will be used in the introduction.
Slightly changed the introduction so it's more focused on the user (using "you will do x" instead of "we will show you x")
Added comments to code.
Added a brief conclusion about what the user has achieved with this tutorial.
Run the notebook.

Fixes Qiskit/qiskit-tutorials#1437

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HuangJunye commented 1 year ago

This is superseded by

Qiskit / qiskit-tutorials

Made changes to improve operators tutorial #1344