Citation
A. Peres et Pf. Scudo, Entangled quantum states as direction indicators, PHYS REV L, 86(18), 2001, pp. 4160-4162
Citations number
9
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007
→ ACNP
Volume
86
Issue
18
Year of publication
2001
Pages
4160 - 4162
Database
ISI
SICI code
0031-9007(20010430)86:18<4160:EQSADI>2.0.ZU;2-X
Abstract
We consider the use of N spin-1/2 particles for indicating a direction in s
pace. If N > 2, their optimal state is entangled. For large N. the mean squ
are error decreases as N-2 (rather than N-1 for parallel spins).