IOSR-JAP   Volume-17 ~ Issue-4 ~ Jul. – Aug. 2025

ABSTRACT: In this article, the physical significance of the 1st order coherence in respect of the classical and quantum world is discussed with due example of Young’s double slit experiment. Mathematical equations governing these phenomenon are established. The corresponding correlation functions in the classical and quantum analogue are discussed.

Keywords: Quantum state; superposition; Young’s double slit experiment; Coherence

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ABSTRACT: The quantum three body problem generally has its own complexities and is difficult to solve. It requires rigorous steps and iterations to find the solution. We often encounter three body system in various branches of physics including Nuclear Physics, Particle, Atomic, Molecular physics, and condensed matter. The underlying physics involved is quite complicated. Faddeev in 1961 made a successful attempt and formulated theory of three particle scattering in a rather.....

Keywords: Scattering length; Efimov states; three body system

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