# Quantum entanglement

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In quantum mechanics , the quantum entanglement or quantum entanglement is a phenomenon wherein two particles (or groups of particles) have quantum states dependent from each other regardless of the distance separating them. Such a state is said to be “entangled” or “entangled” because there are correlations between the observed physical properties of these distinct particles: this state seems to contradict the principle of locality . Thus, two entangled objects O 1 and O 2 are not independent even separated by a large distance,

This observation is at the heart of philosophical discussions on the interpretation of quantum mechanics . It is in fact violated the local realist view of causality defined by Albert Einstein. Einstein referring to it as “spooky action at a distance”. Quantum entanglement has potential applications in the fields of quantum information , such as quantum cryptography , the quantum teleportation or quantum computer.