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Quantum Information Processing
Erschienen in: Quantum Information Processing 10/2017

01.10.2017

Scheme for directly measuring the concurrences of Collins–Gisin and Werner classes polarization entangled mixed states

verfasst von: Ting Zeng, Wen-Jing Chu, Qing Yang, Ming Yang, Wei Song, Zhuo-Liang Cao

Erschienen in: Quantum Information Processing | Ausgabe 10/2017

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Abstract

We present a two-copy-based protocol for directly measuring the concurrence of two-photon polarization entangled mixed states (Collins–Gisin class state and the more complicated bipartite mixed entangled state—Werner class state) without quantum state tomography. The quantum circuit designed for directly measuring concurrence can be realized in an optical system. Our protocol works without the sophisticated controlled-NOT gate, which makes it much simpler than the previous ones. Because all the operations used here are local, the scheme can be used for directly measuring remote mixed entanglement too.
Vorheriger Artikel Relationship between the field local quadrature and the quantum discord of a photon-added correlated channel under the influence of scattering and phase fluctuation noise
Nächster Artikel Parameter optimization in biased decoy-state quantum key distribution with both source errors and statistical fluctuations

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Metadaten
Titel
Scheme for directly measuring the concurrences of Collins–Gisin and Werner classes polarization entangled mixed states
verfasst von
Ting Zeng
Wen-Jing Chu
Qing Yang
Ming Yang
Wei Song
Zhuo-Liang Cao
Publikationsdatum
01.10.2017
Verlag
Springer US
Erschienen in
Quantum Information Processing / Ausgabe 10/2017
Print ISSN: 1570-0755
Elektronische ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-017-1713-9

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