Optimal estimation of entanglement and discord in two-qubit states View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Salvatore Virzì, Enrico Rebufello, Alessio Avella, Fabrizio Piacentini, Marco Gramegna, Ivano Ruo Berchera, Ivo Pietro Degiovanni, Marco Genovese

ABSTRACT

Recently, the fast development of quantum technologies led to the need for tools allowing the characterization of quantum resources. In particular, the ability to estimate non-classical aspects, e.g. entanglement and quantum discord, in two-qubit systems, is relevant to optimise the performance of quantum information processes. Here we present an experiment in which the amount of entanglement and discord are measured exploiting different estimators. Among them, some will prove to be optimal, i.e., able to reach the ultimate precision bound allowed by quantum mechanics. These estimation techniques have been tested with a specific family of states ranging from nearly pure Bell states to completely mixed states. This work represents a significant step towards the development of reliable metrological tools for quantum technologies. More... »

PAGES

3030

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-019-39334-8

DOI

http://dx.doi.org/10.1038/s41598-019-39334-8

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112441710

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30816189


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