Quantum physics (or quantum mechanics) is a fundamental theory in physics that describes the physical properties of nature at the scale of atoms and subatomic particles. It's known for its counterintuitive principles that challenge our classical understanding of reality. Some of the most important concepts in quantum physics include:

Wave-Particle Duality: Particles, like electrons, exhibit both particle-like and wave-like properties. This was demonstrated in experiments like the double-slit experiment, where particles can behave like waves under certain conditions, showing interference patterns.
Superposition: A quantum system can exist in multiple states at once until it is observed. Once observed, it "collapses" into one of the possible states. This idea is famously illustrated in Schrödinger's cat thought experiment, where a cat can be simultaneously alive and dead until it is observed.
Entanglement: When particles become entangled, the state of one particle is directly related to the state of another, no matter how far apart they are. This phenomenon occurs instantaneously, even if the particles are separated by vast distances. Albert Einstein called this "spooky action at a distance."
Uncertainty Principle: Proposed by Werner Heisenberg, this principle states that it is impossible to simultaneously know both the position and momentum of a particle with perfect accuracy. The more precisely one property is measured, the less precisely the other can be known.
Quantization of Energy: In quantum mechanics, energy is not continuous, but rather quantized, meaning that particles can only exist in discrete energy levels. This is evident in atomic and molecular physics, where electrons orbit an atom at specific energy levels.

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