Use of phfqit package: doubt

This morning I have discovered this package named: phfqit. At the page 4 there is, for example, an example

Hmin‘Big{bigotimes_i A_i}[B]

with a character ‘. I have tried to use fontenc, inputenc, utf-8 packages but without success to have the correct output becasue the ‘ it is not recognized.

The minimal working example is:

documentclass[12pt]{article}
usepackage{phfqit}
begin{document}
[Hmin‘Big{bigotimes_i A_i}[B]]
end{document}

documentclass[12pt]{article}
usepackage{phfqit}
begin{document}
[Hmin`Big{bigotimes_i A_i}[B]]
end{document}