What is the contribution of Dr Abdul Qadeer in Physics?

Dr. Abdul Qadeer Khan is primarily known for his contributions to nuclear physics and engineering rather than traditional physics research. He played a pivotal role in Pakistan's nuclear program, particularly in the development of its atomic bomb. His work in uranium enrichment technology significantly advanced Pakistan's capabilities in nuclear science, making him a prominent figure in the field of nuclear energy and defense. However, his activities have also been surrounded by controversy regarding nuclear proliferation.