Quantum chaos. Quantum chaos is a branch of physics which studies how chaotic classical dynamical systems can be described in terms of quantum theory.
The primary question that quantum chaos seeks to answer is: "What is the relationship between quantum mechanics and classical chaos? " The correspondence principle states that classical mechanics is the classical limit of quantum mechanics. If this is true, then there must be quantum mechanisms underlying classical chaos; although this may not be a fruitful way of examining classical chaos.
Quantum field theory. Scattering theory. Top: the real part of a plane wave travelling upwards.
Bottom: The real part of the field after inserting in the path of the plane wave a small transparent disk of index of refraction higher than the index of the surrounding medium. This object scatters part of the wave field, although at any individual point, the wave's frequency and wavelength remain intact. In mathematics and physics, scattering theory is a framework for studying and understanding the scattering of waves and particles. Quantum information science. Quantum information science is an area of study based on the idea that information science depends on quantum effects in physics.
It includes theoretical issues in computational models as well as more experimental topics in quantum physics including what can and cannot be done with quantum information. The term quantum information theory is sometimes used, but it fails to encompass experimental research in the area.