Run coq_makefile -f _CoqProject -o CoqMakefile to update Makefile.
Run rm .*.aux && make clean to clean the compiled files.
Run make to compile the files.
To use simplify quantum expressions, you can use the script MatricesConverter.py as follows:
python3 MatricesConverter.py
enter expression: [ENTER EXPRESSION]
enter name: [ENTER NAME]