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Adds S, SDagger, T and TDagger gates to gate library

Tim Vroomansrequested to merge
add_s_and_t_gates into main

Explanation of changes

Adds the commonly used S and T gates to the gate library. As well as their Hermitian conjugates.

Motivation of changes

The use of these gates is common in quantum information theory. Adding these gates would provided a quality-of-life improvement for users who like to think about S and T gates instead of 90 and 45 degree rotations about the Z axis.

Merge checklist

See also merge request guidelines

  • Merge request has been reviewed (in-depth by a knowledgeable contributor), and is approved by a project maintainer.
  • New code is covered by unit tests (or N/A).
  • New code is documented and docstrings use numpydoc format (or N/A).
  • Newly added/adjusted documentation and docstrings render properly (or N/A).
  • Tested on hardware (or N/A).
  • Check whether performance is significantly affected by looking at the Performance metrics results.
  • Windows tests in CI pipeline pass (manually triggered by maintainers before merging).
    • Maintainers do not hit Auto-merge, we need to actively check as manual tests do not block pipeline

For reference, the issues workflow is described in the contribution guidelines.

Edited by Robert Sokolewicz

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