Room 117

Quantum discord as resource for remote state preparation

Rajarshi Pal

IMSc

The existence of better-than-classical quantum information processing
(QIP) models which consume very little or no entanglement suggests that
separable or weakly entangled states could be extremely useful tools for
information processing as they are much easier to prepare and control even
in dissipative environments. It has been proposed that a resource of
advantage is the generation of quantum discord, a measure of non-classical
correlations that includes entanglement as a subset. Here we show that
quantum discord is the necessary resource for quantum remote state
preparation. We explicitly show that the geometric measure of quantum
discord is related to the fidelity of this task, which provides its
operational meaning. Our results are experimentally demonstrated using
photonic quantum systems. Moreover, we demonstrate that separable states
with non-zero quantum discord can outperform entangled states. Therefore,
the role of quantum discord might provide fundamental insights for
resource-efficient QIP.

Paper link:

www.nature.com/nphys/journal/v8/n9/full/nphys2377.html