https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.researchgate.net%2Ffigure%2FThe-density-matrices-of-the-output-states-of-the-entangling-two-qubit-gate-In-each_fig6_45913682&psig=AOvVaw17pnvRmeBvlLylKjp8qauI&ust=1638064264550000&source=images&cd=vfe&ved=0CAwQjhxqFwoTCMCinIy3t_QCFQAAAAAdAAAAABAZ https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.nature.com%2Farticles%2Fs41467-017-00580-x&psig=AOvVaw17pnvRmeBvlLylKjp8qauI&ust=1638064264550000&source=images&cd=vfe&ved=0CAwQjhxqFwoTCMCinIy3t_QCFQAAAAAdAAAAABAf 
