High-dimensional entanglement certification

Quantum entanglement is the ability of joint quantum systems to possess global properties (correlation among systems) even when subsystems have no definite individual property. Whilst the 2-dimensional (qubit) case is well-understood, currently, tools to characterise entanglement in high dimensions...

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Bibliographic Details
Published in:Scientific reports 2016-06, Vol.6 (1), p.27637-27637, Article 27637
Main Authors: Huang, Zixin, Maccone, Lorenzo, Karim, Akib, Macchiavello, Chiara, Chapman, Robert J., Peruzzo, Alberto
Format: Article
Language:English
Subjects:
639/766/483/481
639/925/927/481
Certification
Humanities and Social Sciences
multidisciplinary
Science
Tomography
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Summary:Quantum entanglement is the ability of joint quantum systems to possess global properties (correlation among systems) even when subsystems have no definite individual property. Whilst the 2-dimensional (qubit) case is well-understood, currently, tools to characterise entanglement in high dimensions are limited. We experimentally demonstrate a new procedure for entanglement certification that is suitable for large systems, based entirely on information-theoretics. It scales more efficiently than Bell’s inequality and entanglement witness. The method we developed works for arbitrarily large system dimension d and employs only two local measurements of complementary properties. This procedure can also certify whether the system is maximally entangled. We illustrate the protocol for families of bipartite states of qudits with dimension up to 32 composed of polarisation-entangled photon pairs.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep27637