Phys. Rev. Lett. 86, 4160–4162 (2001)Entangled Quantum States as Direction IndicatorsReceived 25 October 2000; published in the issue dated 30 April 2001 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). © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4160
DOI:
10.1103/PhysRevLett.86.4160
PACS:
03.67.Hk, 03.65.Ta, 03.65.Ud
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