Single and multi-qubit SWAP test tutorial

[darshkaushik]

Summary

This is a tutorial on SWAP test that might help users to understand how the SWAP test works and how it could be generalized to N-qubits

Details and comments

This is to fix #1228

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[darshkaushik]

@woodsp-ibm can you please help out here

[woodsp-ibm]

If I look in the error log from the build it has this

Notebook error:
NoSuchKernel in tutorials/algorithms/09_swap_test.ipynb:
No such kernel named qiskitml

But I see now from your issue you already have seen that. It relates to this in the notebook at the end from the kernel setting

  "kernelspec": {
   "display_name": "qiskitml",
   "language": "python",
   "name": "qiskitml"
  },

If you look at other notebooks here (view Raw) they look like

  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },

So if you can switch the kernel to python3 which I think is the default, then it should run here too I think

Now the algorithms folder here is intended as a learning path for the code in qiskit.algorithms. I know @nonhermitian created a new category textbook that is more geared towards say textbook algorithms etc - maybe this is better placed there.

[darshkaushik]

@woodsp-ibm it worked, thanks a ton. @nonhermitian I have added a copy of this tutorial in textbook section too as suggested.

Hoping to get a review.

[darshkaushik]

@nonhermitian @woodsp-ibm can you give this a review

[Eric-Arellano]

Hi, pardon that this never got a final review :/ Thank you for making Qiskit better!

We're very soon archiving the qiskit-tutorials repository to simplify how we build our documentation. The tutorials will be built directly in https://github.com/Qiskit/qiskit-terra and algorithms related ones in https://github.com/qiskit-community/qiskit-algorithms.

If you'd still be interested in landing this, it'd be best to open up a new PR in qiskit-algorithms. They're setting up the tutorial infrastructure this week.

I unfortunately can't comment on whether the PR would be accepted or not because I don't know the underlying content well enough. But the repo is more actively maintained so should get a response, and I can help ping the relevant people if you haven't heard back.

Again, sorry for us not reviewing this earlier!