Singlet aided infinite resource reduction in the comparison of distant fields
S. Bose, S. F. Huelga, M. B. Plenio
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.
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