Quantum Information Processing Without Entanglement

Science  21 Jan 2000:
Vol. 287, Issue 5452, pp. 441-442
DOI: 10.1126/science.287.5452.441

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Quantum computers have the potential to significantly reduce the amount of time required for certain computational tasks. It is often assumed that for a quantum computer to be efficient, entanglement between different states is required. Ahn et al. (page 463) show that a single quantum system possessing no entanglement whatsoever can implement the search algorithm in a non-classical and highly effective way.