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PHYSICAL REVIEW LETTERS
Volume 86, Issue 18, Pages 4160-4162Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.4160
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We consider the use of N spin-1/2 particles for indicating a direction in space. If N > 2, their optimal state is entangled. For large N. the mean square error decreases as N-2 (rather than N-1 for parallel spins).
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