Added more options for custom claws in TransmonCross

[clarkmiyamoto]

What are the issues this pull addresses (issue numbers / links)?

Slight corrections & improvements to #949

Did you add tests to cover your changes (yes/no)?

Yes, updated corresponding tests for TransmonCross.

Did you update the documentation accordingly (yes/no)?

Yes

Did you read the CONTRIBUTING document (yes/no)?

yes

Summary

The standard MIT LL candle qubit has a nonuniform claw thickness. One of the assumptions in the current TransmonCross is that you have uniform claw thickness, so this design isn't possible in Qiskit Metal (before this PR!). This update is to give front-end users more control of their claw designs.

To illustrate what I mean here's a new potential design you can create.

And yes, it is backward compatible!

Details and comments

• Increase customizability of TransmonCross claws.
• Fixed pin placement of connector_type = 1

[zlatko-minev]

Ready for a review?

[clarkmiyamoto]

Ready for a review?

Yeah ready!

[zlatko-minev]

Looks good to me overall, just double check this should be backward-compatible, right?

in other words, people who have made previous designs using this, won’t even notice a difference when loading the updated version. Unless you change one of these options, right

[clarkmiyamoto]

in

Correct. If the user doesn't input ground_spacing_back or claw_width_back it'll default to a uniform style.

[zlatko-minev]

It's overall looking good to me, I'll plan to merge