TY - JOUR
T1 - Relative states, quantum axes, and quantum references
AU - Bagan, E.
AU - Muñoz-Tapia, R.
AU - Iblisdir, S.
PY - 2006/3/3
Y1 - 2006/3/3
N2 - We address the problem of measuring the relative angle between two "quantum axes" made out of N1 and N2 spins. Closed forms of our fidelitylike figure of merit are obtained for an arbitrary number of parallel spins. The asymptotic regimes of large N1 and/or N2 are discussed in detail. The extension of the concept "quantum axis" to more general situations is addressed. We give optimal strategies when the first quantum axis is made out of parallel spins whereas the second is a general state made out of two spins. © 2006 The American Physical Society.
AB - We address the problem of measuring the relative angle between two "quantum axes" made out of N1 and N2 spins. Closed forms of our fidelitylike figure of merit are obtained for an arbitrary number of parallel spins. The asymptotic regimes of large N1 and/or N2 are discussed in detail. The extension of the concept "quantum axis" to more general situations is addressed. We give optimal strategies when the first quantum axis is made out of parallel spins whereas the second is a general state made out of two spins. © 2006 The American Physical Society.
UR - https://dialnet.unirioja.es/servlet/articulo?codigo=1965203
U2 - 10.1103/PhysRevA.73.022341
DO - 10.1103/PhysRevA.73.022341
M3 - Article
SN - 1050-2947
VL - 73
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
M1 - 022341
ER -