Characteristics of a system that are described by quantum mechanics, such as superposition and entanglement.Quantum properties are the characteristics of physical systems that have no classical analog and are described by the mathematics of quantum mechanics. These include superposition, where a particle exists in multiple states simultaneously until measured; entanglement, where the states of two or more particles become correlated in ways that defy classical intuition; and quantization, where certain observables like energy or angular momentum take on discrete, rather than continuous, values. These properties govern the behavior of atoms, electrons, and photons, and underpin the structure of matter and light.
Quantum mechanics was developed in the 1920s by Werner Heisenberg, Erwin Schrödinger, Max Born, and others, building on Max Planck's 1900 quantum hypothesis and Niels Bohr's 1913 atomic model.
Quantum systems are described by a wavefunction, a mathematical object that encodes the probabilities of all possible outcomes. The wavefunction evolves deterministically according to the Schrödinger equation, but upon measurement, it 'collapses' to a single definite state. Entanglement arises when two particles interact in such a way that their wavefunctions become inseparable, so that measuring one instantly determines the state of the other, regardless of distance. Quantization emerges from boundary conditions, such as those confining an electron in an atom, which allow only specific standing-wave patterns.
Quantum properties are harnessed in lasers, transistors, MRI scanners, and are the basis for emerging technologies like quantum computing and quantum cryptography.
Entanglement was called 'spooky action at a distance' by Albert Einstein, who doubted it, but experiments since the 1980s have repeatedly confirmed that it is real.
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