Coherent Physics and Its Applications

R. Loudon

Monique Combescure, Didier Robert

Pankaj Kumar Jha

Quantum coherence and interference effects in atomic and molecular physics has been extensively studied due to intriguing counterintuitive physics and potential important applications. Here we present one such application of using quantum coherence to generate and enhance gain in extreme ultra-violet(XUV)(@58.4nm in Helium) and infra-red(@794.76nm in Rubidium) regime of electromagnetic radiation. We show that using moderate external coherent drive, a substantial enhancement in the energy of the lasing pulse can be achieved under optimal conditions. We also discuss the role of coherence. The present paper is intended to be pedagogical on this subject of coherence-enhanced lasing.

Maksim Kravchenko, Ed. A. Rudak, Т. Н. Корбут +1 more

Abstract A study is performed of the theory of coherent states’ applicability to solving statistical problems in the reactor physics. A mathematical description of the theory is provided in the formalism of both overlap integrals and operators of the creation and annihilation of phonons. The Poisson distribution is compared to coherent states, and the applicability of the formalism of the theory of coherent states to the physics of reactors is analyzed.

Jean-Pierre Antoine, Bagarello, Fabio, Jean‐Pierre Gazeau

DAVID J. ROWE

The three-dimensional harmonic oscillator plays a central role in nuclear physics. It provides the underlying structure of the independent-particle shell model and gives rise to the dynamical group structures on which models of nuclear collective motion are based. It is shown that the three-dimensional harmonic oscillator features a rich variety of coherent states, including vibrations of the monopole, dipole, and quadrupole types, and rotations of the rigid flow, vortex flow, and irrotational flow types. Nuclear collective states exhibit all of these flows. It is also shown that the coherent state representations, which have their origins in applications to the dynamical groups of the simple harmonic oscillator, can be extended to vector coherent state representations with a much wider range of applicability. As a result, coherent state theory and vector coherent state theory become powerful tools in the application of algebraic methods in physics.