Experimental measurement of nonlinear entanglement witness by hyper-entangling two-qubit states
arXiv:1805.11337 · doi:10.1103/PhysRevA.98.032307
Abstract
We demonstrate that non-linear entanglement witnesses can be made particularly useful for entanglement detection in hyper-entangled or multilevel states. We test this idea experimentally on the platform of linear optics using a hyper-entangled state of two photons. Instead of several simultaneous copies of two-photon entangled states, one can directly measure the witness on single copy of a hyper-entangled state. Our results indicate that hyper-entanglement can be used for quick entanglement detection and it provides a practical testbed for experiments with non-linear entanglement witnesses.
arXiv comment6 pages, 5 figures
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