Article

Broadcasting Quantum Fisher Information

06/2012; DOI:10.1103/PhysRevA.87.050302
Source: arXiv

ABSTRACT It is well known that classical information can be cloned, but non-orthogonal
quantum states cannot be cloned, and non-commuting quantum states cannot be
broadcast. We conceive a scenario in which the object we want to broadcast is
the statistical distinguishability, as quantified by quantum Fisher
information, about a signal parameter encoded in quantum states. We show that
quantum Fisher information cannot be cloned, whilst it might be broadcast even
when the input states are non-commuting. This situation interpolates between
cloning of classical information and no-broadcasting of quantum information,
and indicates a hybrid way of information broadcasting which is of particular
significance from both practical and theoretical perspectives.

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Keywords

classical information
 
hybrid way
 
information broadcasting
 
input states
 
no-broadcasting
 
non-commuting quantum states
 
quantum states
 
signal parameter encoded
 
situation interpolates
 
theoretical perspectives