You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

mqt.qmap
1.12.0

This version was deleted from PyPI around 2026-02-25. Installing fails with:
$ pip3 install mqt.qmap==1.12.0 ERROR: Could not find a version that satisfies the requirement mqt.qmap==1.12.0