Ultrafine entanglement witnessing

Shahandeh, Farid, Ringbauer, Martin, Loredo, Juan C. and Ralph, Timothy C. (2017) Ultrafine entanglement witnessing. Physical Review Letters, 118 11: 110502-1-110502-5. doi:10.1103/PhysRevLett.118.110502

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Author Shahandeh, Farid
Ringbauer, Martin
Loredo, Juan C.
Ralph, Timothy C.
Title Ultrafine entanglement witnessing
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2017-03-01
Year available 2017
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.118.110502
Open Access Status File (Publisher version)
Volume 118
Issue 11
Start page 110502-1
End page 110502-5
Total pages 5
Place of publication College Park, MD United States
Publisher American Physical Society
Collection year 2018
Language eng
Abstract Entanglement witnesses are invaluable for efficient quantum entanglement certification without the need for expensive quantum state tomography. Yet, standard entanglement witnessing requires multiple measurements and its bounds can be elusive as a result of experimental imperfections. Here, we introduce and demonstrate a novel procedure for entanglement detection which simply and seamlessly improves any standard witnessing procedure by using additional available information to tighten the witnessing bounds. Moreover, by relaxing the requirements on the witness operators, our method removes the general need for the difficult task of witness decomposition into local observables. We experimentally demonstrate entanglement detection with our approach using a separable test operator and a simple fixed measurement device for each agent. Finally, we show that the method can be generalized to higher-dimensional and multipartite cases with a complexity that scales linearly with the number of parties.
Keyword Sufficient conditions
Mixed states
Separability
Observables
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Sun, 26 Mar 2017, 01:00:51 EST by Web Cron on behalf of School of Mathematics & Physics