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A quantum protocol where a pair of entangled particles transfers its entanglement to two other particles that have never interacted.

A secure communication technique which uses quantum mechanics, especially entanglement, to enable two parties to produce a shared, random secret key known only to them for encrypting and decrypting messages.

The concept that an object can be influenced directly by another object at any distance, without any exchange through the space in between.

The belief that objects have definite properties and states independent of measurement, and that information cannot travel faster than the speed of light.

A process by which the state of a particle can be transmitted from one location to another, with the help of entanglement and classical communication.

A theorem stating that it is impossible to create an identical copy of an arbitrary unknown quantum state.

The state of a quantum system, fully described by a wave function, which encodes the probabilities of the outcomes of all possible measurements on the system.

A theorem that shows no physical theory of local hidden variables can ever reproduce all of the predictions of quantum mechanics.

A fundamental principle of quantum mechanics whereby a particle exists in all its possible states simultaneously, but when measured, it gives results corresponding to only one of the possible configurations.

A fundamental quantum property of particles that is akin to angular momentum, but not exactly the same as the classical spinning motion.

The process by which a quantum system loses its quantum properties when interacting with an environment, leading to the classical or non-quantum behavior.

A thought experiment by Einstein, Podolsky, and Rosen that questions the completeness of quantum mechanics, demonstrating the peculiar nature of quantum entanglement.

Correlations between entangled particles' measurements that are too strong to be explained by classical physics, thus revealing the quantum nature of the particles.

A technique used to send two bits of classical information using only one entangled qubit, by exploiting the properties of quantum entanglement.