Quantum Entanglement: Spooky Action at a Distance

Stan Gudder


Quantum entanglement is an important resource in quantum information technologies. Here, we study and characterize in a precise mathematical language some of the weird and nonintuitive features of quantum entanglement. We begin by illustrating why entanglement implies action at a distance. We then introduce a simple criterion for determining when a pure quantum state is entangled. Finally, we present a measure for the amount of entanglement for a pure state.

Quanta 2020; 9: 1–6.

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DOI: https://doi.org/10.12743/quanta.v9i1.113

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ISSN: 1314-7374