Wikipedia/Physics/Quantum Mechanics
Quantum Entanglement: The Phenomenon That Defies Classical Physics
Last edited: Feb 2026Read time: 12 min
In quantum mechanics, quantum entanglement is a phenomenon that occurs when a group of particles are generated, interact, or share spatial proximity in a way such that the quantum state of each particle of the group cannot be described independently.
Quantum entanglement is a phenomenon in quantum physics where two or more particles become correlated in such a way that the quantum state of each particle cannot be described independently of the others, even when separated by a large distance.
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Measurements of physical properties such as position, momentum, spin, and polarization performed on entangled particles can, in some cases, be found to be perfectly correlated.
The phenomenon was the subject of a 1935 paper by Albert Einstein, Boris Podolsky, and Nathan Rosen, and several papers by Erwin Schrödinger shortly thereafter, describing what came to be known as the EPR paradox.
See also
→ Bell's theorem→ EPR paradox→ Quantum teleportation→ Quantum computing