I-QMapper
Copyright 2026 Milana Bazayeva and Kenneth M. Merz Jr

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

This product includes software developed at IBM and in the Qiskit
community ecosystem:

1. Portions of iqmapper/auto_lucj.py (the layout error-scoring routine
   `lightweight_layout_error_scoring`) were adapted from IBM code now
   incorporated in ffsim (`ffsim.qiskit.generate_lucj_pass_manager`),
   https://github.com/qiskit-community/ffsim
   (C) Copyright IBM.
   Licensed under the Apache License, Version 2.0.
   The adapted portions have been modified from the originals.
   The ffsim library is described in: K. J. Sung et al., "ffsim: Faster
   simulation of fermionic quantum circuits", arXiv:2605.03123 (2026).

2. The circuit-fidelity estimator in iqmapper/export/scoring.py
   (`estimate_circuit_fidelity`) implements a cost function in the style
   of mapomatic, https://github.com/qiskit-community/mapomatic
   (C) Copyright IBM.
   Licensed under the Apache License, Version 2.0.
   This is an independent reimplementation of the approach described in:
   P. D. Nation and M. Treinish, "Suppressing quantum circuit errors due
   to system variability", PRX Quantum 4, 010327 (2023).
