Remove native-gates file; update get-qpu-information, qpu-information, and processor-types accordingly

[abbycross]

Closes #3070

@jyu00 I am removing for_loop and switch_case from Heron. Where should the fractional gates link point - the page in the guides, or somewhere in the API (like the rest of the table)? Also, anything to put in the notes field?

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[jyu00]

I'm going to raise my objection again about hard coding native gate set, especially since the page says

while the native gate set never changes.

and here we are, changing it 🙂. Also if you run the Qiskit code from that page, or view on IQP, you will not find if_else returned for any backends, even though it's listed for all processor families.

If we don't want to remove the page, my suggestion would be to

• Add a warning that you need to run the Qiskit code or view on IQP to find the latest and greatest, and/or
• Break the table into "static gates that never change" and "operations that may change". Conditionals and fractional gates would fall into the second category.

[abbycross]

cc: @lerongil @kaelynj
Looking back at the issue, seems like Abby M's objection was because the page is getting a steady number of views, and removing the tables would decimate the length. Leron and Kaelyn: what are your thoughts on moving forward?

[abbycross]

Leron is in favor of pulling this page - redirect to processor-types. We need to look at the native gates listed on that page for updates

[jyu00]

I didn't realize the processor type page also has native gates and operations hard coded 😅. So that page will need to be updated as well.

I think some information from the native gate page is worth preserving, if the decision is to pull it:

• The Qiskit code snippet on getting supported instructions. This can be merged with https://quantum.cloud.ibm.com/docs/en/guides/get-qpu-information
• Link to the API reference of each basis gate, e.g. CZ. This is not strictly necessary but nice to have for lazy people lol. This can also be merged with https://quantum.cloud.ibm.com/docs/en/guides/qpu-information (as generic info; not processor specific)
• The note on init_qubits flag. It really doesn't belong to this page anyway, given it has nothing to do with native gates. I'd probably either just add that text to the API reference, or move to https://quantum.cloud.ibm.com/docs/en/guides/repetition-rate-execution (since it's related to resetting qubit state)

[abbycross]

@jyu00 Should I skip bringing over the info on how to find supported gates on the Platform, since this page is specific to Qiskit? I guess I could move this piece to the QPU information page?.... thoughts?

[abbycross]

Here's the preview for more context

[jyu00]

I agree it should be moved to QPU information page, especially since these two are actually different - one shows non-unitary operations and the other doesn't.

Interesting that the Additional information available on the details page for each QPU section on the QPU information page doesn't already talk about basis gates, even though it's on the details page.

I don't want to derail this PR further, but the separation of this page and the "QPU information" page is not very clear to me. The latter appears to be the compute resources page on the Platform, but it also mentions Qiskit. And the two pages have some duplicated data... maybe something to consider in a separate issue.

[abbycross]

I almost typed the same thing yesterday! - I find it very confusing that we have two such similarly-named pages. I'll open a new issue to consider this after this PR is done

[abbycross]

@jyu00 I am removing if_else from the list of native gates, unless you expect it to come back in future public backends?

[abbycross]

Last question (for now) @jyu00 - I'm guessing you'd prefer not to hard-code the native gates on the processor-types page either! - so should we point to the new native gates section in the qpu-information page from each processor family?

[qiskit-bot]

One or more of the following people are relevant to this code:

• @abbycross
• @beckykd
• @frankharkins
• @lerongil
• @mtreinish
• @nbronn

[abbycross]

Thanks @jyu00! I think I've addressed all your feedback - do you see anything I've missed?

[jyu00]

Some comments on IQP terminology but otherwise looks good!

[jyu00]

I think we should just delete this, since the basis gates listed on IQP are actually native gates (i.e. you can't change them).

[jyu00]

After reviewing the QPU information section, I think we should just delete this. This paragraph was more useful when you could add custom gates via pulse gates... but that's no longer supported. It's now confusing to have these as separate terms since IQP uses basis gates to mean native gates.