21. His recent work includes elaborations on the role of the Wigner function in terms of quantum optics . 22. Knight's work is concerned principally with theoretical quantum optics , strong field physics and especially quantum information science. 23. He was awarded the Shanti Swarup Bhatnagar Award for work in Nonlinear and Quantum Optics in 1980 24. Bridging condensed matter theory and quantum optics he specialises in nanophotonics, plasmonics, metamaterials and semiconductor laser dynamics. 25. The concept of higher order or quantum coherence of sources was introduced in quantum optics by Glauber. 26. He has done experimental research in the areas of optical lattices, quantum information, quantum chaos, and quantum optics . 27. "' Raymond Y . Chiao "'is an American physicist best known for his experimental work in quantum optics . 28. A new chapter on " Quantum Optics of Solids " summarized the research work at Pohl's G�ttingen Institute. 29. Like almost always in many-body physics or quantum optics , it is most convenient to apply the band index. 30. The distinction between optical physics and quantum optics is the use of semi-classical and fully quantum treatments respectively.