Proposed optical realisation of a two photon, four-qubit entangled state
arXiv:1703.01965 · doi:10.1088/2040-8986/aa72af
Abstract
The four-qubit states , exhibiting genuinely multi-partite entanglement have been shown to have many interesting properties and have been suggested for novel applications in quantum information processing. In this work we propose a simple quantum circuit and its corresponding optical embodiment with which to prepare photon pairs in the states. Our approach uses hyper-entangled photon pairs, produced by the type-I spontaneous parametric down-conversion (SPDC) process in two contiguous nonlinear crystals, together with a set of simple linear-optical transformations. Our photon pairs are maximally hyper-entangled in both their polarisation and orbital angular momentum (OAM). After one of these daughter photons passes through our optical setup, we obtain photon pairs in the hyper-entangled state , and the states can be achieved by further simple transformations.
arXiv commentSubmitted to Journal of Optics
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