Entangled quantum states as direction indicators

Details Entangled quantum states as direction indicators Entangled quantum states as direction indicators

2000-10-25

arxiv.org/abs/quant-ph/0010085v1

Phys. Rev. Lett. 86 (2001) 4160

Physics

Quantum Physics

3 pages REVTEX and one PostScript figure

Scientific paper

10.1103/PhysRevLett.86.4160

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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