Measuring entanglement in a photonic embedding quantum simulator

Loredo, J. C., Almeida, M. P., Di Candia, R., Pedernales, J. S., Casanova, J., Solano, E. and White, A. G. (2016) Measuring entanglement in a photonic embedding quantum simulator. Physical Review Letters, 116 7: 070503.1-070503.5. doi:10.1103/PhysRevLett.116.070503

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Author Loredo, J. C.
Almeida, M. P.
Di Candia, R.
Pedernales, J. S.
Casanova, J.
Solano, E.
White, A. G.
Title Measuring entanglement in a photonic embedding quantum simulator
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 1079-7114
0031-9007
Publication date 2016-02-18
Year available 2016
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.116.070503
Open Access Status File (Publisher version)
Volume 116
Issue 7
Start page 070503.1
End page 070503.5
Total pages 5
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2017
Language eng
Abstract Measuring entanglement is a demanding task that usually requires full tomography of a quantum system, involving a number of observables that grows exponentially with the number of parties. Recently, it was suggested that adding a single ancillary qubit would allow for the efficient measurement of concurrence, and indeed any entanglement monotone associated with antilinear operations. Here, we report on the experimental implementation of such a device - an embedding quantum simulator - in photonics, encoding the entangling dynamics of a bipartite system into a tripartite one. We show that bipartite concurrence can be efficiently extracted from the measurement of merely two observables, instead of 15, without full tomographic information.
Keyword Entanglement
Tomography
Quantum system
Single ancillary qubit
Measurement of concurrence
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
Centre for Quantum Computer Technology Publications
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