Quantum electrodynamics is used today primarily in theoretical physics research to study the interaction between electromagnetic radiation and charged particles at the quantum level. It provides a framework for understanding phenomena such as particle decay rates, scattering processes, and the behavior of electromagnetic fields in extreme conditions. Quantum electrodynamics also plays a role in the development of technologies such as quantum computing and quantum communication.
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"Introduction to Electrodynamics" by David J. Griffiths is a popular textbook that covers the principles of electromagnetism. It provides a comprehensive treatment of the subject with clear explanations and worked examples. It is commonly used in undergraduate courses on electrodynamics.
The atomic model used today, known as the quantum mechanical model, incorporates the principles of quantum mechanics including the concept of electron clouds and probability distributions of electron locations, while Bohr's model focused on specific orbits for electrons. The quantum mechanical model provides a more accurate description of electron behavior and allows for a better understanding of the complexities of atomic structure.
There is unlikely to be a successor to a quantum theory of light, by the definition that the quantum theory of light is that "Light is made up of discernible particles", has very strong evidence to support it, and no alternative explanation has yet been found to explain such effects as the photoelectric effect.If you mean quantum electrodynamics, the section of the standard model of particle physics that explains light, electricity and magnetism, and therefore the standard model of particle interaction, then the only answer is that absolutely nobody knows. In fact, finding a successor to the standard model, which despite being one of the best theories ever developed is full of more holes than the titanic if taken as a theory of everything, is one of the biggest deals in all of science.One possible successor to the theory of quantum electrodynamics is the section of superstring theory that explains electromagnetism, but there are many who don't think string theory will be the answer to physics' problems, and certainly string theorists have yet to find any strong evidence supporting their theories.
It is difficult to say who has the greatest contribution as all three physicists, Heisenberg, Dirac, and Schrodinger, made significant contributions to the development of quantum mechanics. Heisenberg is known for his matrix mechanics, Dirac for his work on quantum electrodynamics, and Schrodinger for his wave equation. Each of their contributions played a crucial role in shaping our understanding of quantum mechanics.
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