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Entanglement means the joint quantum state cannot be factored into independent states of the parts; the whole must be treated as an inseparable system.
Quantum entanglement is a uniquely quantum phenomenon where the quantum state of each particle in a group cannot be described independently of the others, even if the particles are far apart. In an entangled system, measurements performed on one particle can be perfectly (or strongly) correlated with measurements on the other. A common example is a pair of particles produced with total spin zero: measuring one particle’s spin along a chosen axis determines the other particle’s spin along the same axis (e.g., anticorrelated results in the singlet state).
Entanglement means the joint quantum state cannot be factored into independent states of the parts; the whole must be treated as an inseparable system.
Entangled measurements can show strong correlations that cannot, in general, be reproduced by classical probability or explained by local hidden variables.
Bell-inequality-violating experiments confirm that entanglement produces correlations inconsistent with local realism, while still not enabling faster-than-light communication.
A phenomenon where the quantum state of particles in a system cannot be described independently, so measurements on one part are correlated with measurements on the others.
A specific entangled two-particle spin-0 state in which measurements along the same axis yield perfectly anticorrelated outcomes.
A class of theories that assume measurement outcomes are predetermined by hidden properties carried by each particle, with no need for faster-than-light influence.
A bound on the strength of correlations predicted by any theory obeying local realism; quantum entanglement can violate this bound.
The (effective) update of the quantum state after a measurement, which in entangled systems affects the description of the whole correlated system.
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