Photonics Dictionary

quantum entanglement

Quantum entanglement is a phenomenon in quantum mechanics where two or more particles become correlated to such an extent that the state of one particle instantly influences the state of the other(s), regardless of the distance separating them. This means that the properties of each particle, such as position, momentum, spin, or polarization, are interdependent in a way that classical physics cannot explain.

When particles become entangled, their individual quantum states become inseparable, even when they are separated by vast distances. This phenomenon was famously described by Einstein, Podolsky, and Rosen (EPR) in 1935, leading to the EPR paradox, which challenged the completeness of quantum mechanics.

Quantum entanglement is a fundamental aspect of quantum mechanics and plays a crucial role in various quantum technologies, including quantum computing, quantum cryptography, and quantum teleportation. Despite its counterintuitive nature, entanglement has been experimentally verified and is a cornerstone of our understanding of the quantum world.

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