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- Quantum Electrodynamics
- Quantum Gravity (or Quantum Theory of Gravity)
- Quantum State
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Quantum:
The smallest chunk into which something can be divided in physics. Quantized phenomena are restricted to discrete values rather than to a continuous set of values. Some quanta take the form ofelementary particles, such as photons which are the quanta of the electromagnetic field. Quanta are measured on the tiny Planck scale of the order of around 10-35 metres.
Quantum Electrodynamics:
Sometimes shortened to QED, it is essentially the theory of how light interacts with matter. More specifically, it deals with the interactions between electrons, positrons (antielectrons) and photons. It explains almost everything about the everyday world, from why the ground is solid to how a laser works to the chemistry of metabolism to the operation of computers.
Quantum Gravity (or Quantum Theory of Gravity):
A so-called “theory of everything” which combines the General Theory of Relativity (the theory of the very large, which describes one of the fundamental forces of nature, gravity) with quantum theory (the theory of the very small, which describes the other three fundamental forces, electromagnetism, theweak nuclear force and the strong nuclear force) into a unified theory. However, even the most promising candidates, like superstring theory and loop quantum gravity, still need to overcome major formal and conceptual problems, and this is still very much a work in progress.
Quantum State:
The set of characteristics describing the condition a quantum mechanical system is in. It can be described by a wave function or a complete set of quantum numbers (energy, angular momentum,spin, etc), although, when observed, the system is forced into a specific stationary "eigenstate". If a particle within a quantum system (such as an electron within an atom) moves from one quantum state to another, it does so instantaneously and in discontinuous steps (known as quantum leaps or jumps) without ever being in a state in between.
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