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Quantum discord as resource for remote state preparation

Autor(en)
Borivoje Dakic, Yannick Ole Lipp, Xiaosong Ma, Martin Ringbauer, Sebastian Kropatschek, Stefanie Barz, Tomasz Paterek, Vlatko Vedral, Anton Zeilinger, Caslav Brukner, Philip Walther
Abstrakt

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.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Österreichische Akademie der Wissenschaften (ÖAW), National University of Singapore (NUS)
Journal
Nature Physics
Band
8
Seiten
666-670
Anzahl der Seiten
5
ISSN
1745-2473
DOI
https://doi.org/10.1038/NPHYS2377
Publikationsdatum
09-2012
Peer-reviewed
Ja
ÖFOS 2012
103026 Quantenoptik
Schlagwörter
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/43fb1fe5-29af-4206-adf4-f9c4784bdeb0