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Testing for entanglement with periodic coarse-graining

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons217535

Rudnicki,  Łukasz
Quantumness, Tomography, Entanglement, and Codes, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Volltexte (frei zugänglich)

arXiv:1506.01095.pdf
(Preprint), 2MB

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Zitation

Tasca, D. S., Rudnicki, Ł., Aspden, R. S., Padgett, M. J., Ribeiro, P. H. S., & Walborn, S. P. (in preparation). Testing for entanglement with periodic coarse-graining.


Zitierlink: http://hdl.handle.net/21.11116/0000-0000-D42B-1
Zusammenfassung
Continuous variables systems find valuable applications in quantum information processing. To deal with an infinite-dimensional Hilbert space, one in general has to handle large numbers of discretized measurements in tasks such as entanglement detection. Here we employ the continuous transverse spatial variables of photon pairs to experimentally demonstrate novel entanglement criteria based on a periodic structure of coarse-grained measurements. The periodization of the measurements allows for an efficient evaluation of entanglement using spatial masks acting as mode analyzers over the entire transverse field distribution of the photons and without the need to reconstruct the probability densities of the conjugate continuous variables. Our experimental results demonstrate the utility of the derived criteria with a success rate in entanglement detection of $\sim60\%$ relative to $7344$ studied cases.