Quantum mechanics - definition
Quantum mechanics - definition
Quantum mechanics is a branch of theoretical physics dealing with the description of phenomena on the atomic and subatomic Scales, where the classical laws of mechanics no longer apply. It is based on the concept of quantisation of physical quantities, according to which certain properties of particles - such as energy, momentum or angular momentum - can only take on discrete values, called quanta.
A central role in quantum mechanics is played by the wave function, which represents the state of a quantum system. It describes the probability of finding a particle at a particular place and time, according to the Copenhagen interpretation. The development of this theory led to the formulation of the Schrödinger equation, which is the primary tool for describing the evolution of the state of a system over time. Other key principles are the Heisenberg indeterminacy principle and the principle of superposition of states.
Quantum mechanics also introduces the concept of corpuscular-wave duality, according to which objects such as electrons or photons can exhibit both wave and particle properties, depending on how they are observed. It describes phenomena such as quantum tunneling, entanglement of states, quantum interference and decoherence - which have no counterparts in classical physics.
From an application point of view, quantum mechanics is the foundation of modern electronics, Optoelectronics, quantum chemistry, condensed matter physics, laser technologies and quantum computing. It provides an understanding of the structure of atoms and molecules, electrical conductivity, properties Semiconductors and mechanisms of chemical reactions. Its advanced concepts are also used in the design of quantum systems such as quantum computers, quantum sensors and secure communication systems based on quantum entanglement.
Quantum mechanics, although strongly grounded experimentally, remains a field with deep philosophical implications related to the nature of measurement, determinism and the interpretation of physical reality.
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