Singlet aided infinite resource reduction in the comparison of distant fields
arXiv:quant-ph/0005020 · doi:10.1103/PhysRevA.63.032313
Abstract
We present a task which can be faithfully solved with finite resources only when aided by particles prepared in a particular entangled state: the singlet state. The task consists of identifying the mutual parallelity or orthogonality of weak distant magnetic fields whose absolute directions are completely unknown.
4 pages, 2 figures