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An entangled system must be described as a whole because its particles do not possess fully independent quantum states.
Quantum entanglement is a phenomenon in which the quantum state of two or more particles cannot be described independently, even when the particles are separated by large distances. Measurements of properties such as spin, polarization, momentum, or position can produce strong, sometimes perfect, correlations between the particles. For example, two particles with a total spin of zero may always be measured with opposite spins along the same axis. Entanglement is a distinctly quantum feature with no exact classical counterpart. Although measuring one particle changes the state used to describe the entangled system and reveals correlated information about the other, the individual measurement results are unpredictable. Therefore, entanglement cannot be used by itself to transmit information faster than light. Experiments testing Bell inequalities have confirmed that these correlations cannot be explained by local hidden variables, and entanglement is now considered a valuable resource for quantum communication, cryptography, and computation.
An entangled system must be described as a whole because its particles do not possess fully independent quantum states.
Measurements of entangled particles can produce correlations that are stronger than any correlations allowed by classical local theories.
Entanglement does not enable faster-than-light communication because individual measurement outcomes cannot be controlled.
Bell inequality experiments have experimentally confirmed the nonclassical nature of quantum entanglement.
Entanglement is used as a resource in emerging technologies such as quantum computing, teleportation, and quantum cryptography.
A quantum phenomenon in which the state of each particle in a group is dependent on the states of the others, even across large distances.
A composite quantum state that cannot be expressed as a simple product of independent states for its individual particles.
A mathematical limit that must be satisfied by theories based on local hidden variables but can be violated by quantum-mechanical entangled systems.
Hypothetical pre-existing properties intended to explain quantum correlations without faster-than-light influences.
The loss of quantum entanglement when interaction with the environment causes a system to behave less like an isolated quantum state.
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