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arXiv:2104.11784 · Quantum Information Processing

Polarization–orbital angular momentum duality assisted entanglement observation for indistinguishable photons

Nijil Lal, Sarika Mishra, Anju Rani, Anindya Banerji, Chithrabhanu Perumangatt, Ravindra Pratap Singh

Published Jan 23, 2023• 2 citations
arXivHTMLPDF
DOI
10.1007/s11128-022-03815-z

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We investigate two-photon entangled states using two important degrees of freedom of the electromagnetic field, namely orbital angular momentum (OAM) and spin angular momentum. For photons propagating in the same direction we apply the idea of entanglement duality and develop schemes to do entanglement sorting based on either OAM or polarization. In each case the entanglement is tested using appropriate witnesses. We finally present generalizations of these ideas to three- and four-photon entangled states.
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