Phys. Rev. Lett. 92, 217901 (2004) [4 pages]How to Observe High-Dimensional Two-Photon Entanglement with Only Two DetectorsReceived 2 February 2004; published 24 May 2004 We propose a novel setup to investigate the entanglement of orbital angular momentum states living in a high-dimensional Hilbert space. We incorporate noninteger spiral phase plates in spatial analyzers, enabling us to use only two detectors. The two-photon states that are produced are not confined to a 2×2-dimensional Hilbert space, and the setup allows the probing of correlations in a high-dimensional space. For the special case of half-integer spiral phase plates, we predict that the Clauser-Horne-Shimony-Holt-Bell parameter S is larger than achievable for two qubits (S=2√2), namely, S=31/5. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.217901
DOI:
10.1103/PhysRevLett.92.217901
PACS:
03.67.Mn, 42.50.Dv
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