Generation of orbital angular momentum bell states and their verification via accessible nonlinear witnesses

Megan Agnew, Jeff Z. Salvail, Jonathan Leach, Robert W Boyd

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18 Citations (Scopus)
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The controlled generation of entangled states and their subsequent detection are integral aspects of quantum information science. In this Letter, we implement a simple and precise technique that produces any of the four Bell states in the orbital angular momentum degree of freedom. We then use these states to perform the first experimental demonstration of an accessible nonlinear entanglement witness. Such a witness determines entanglement by using the same measurements as required for a linear witness but can detect, in this case, twice as many states as a single linear witness can. We anticipate that our method of state preparation and nonlinear witnesses will have further uses in areas of quantum science, such as superdense coding and quantum key distribution.

Original languageEnglish
Article number030402
Number of pages5
JournalPhysical Review Letters
Issue number3
Publication statusPublished - Jul 2013



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