A new twist on quantum communication in fiber

Phys.org  January 24, 2020
While Hilbert spaces with higher dimensionality it requires custom multimode fiber and limited by decoherence-induced mode coupling. An international team of researchers (China, South Africa) circumvented this by transporting multidimensional entangled states down conventional single-mode fiber (SMF). By entangling the spin-orbit degrees of freedom of a biphoton pair, passing the polarization (spin) photon down the SMF while accessing multiple orbital angular momentum (orbital) subspaces with the other, they realized multidimensional entanglement transport. They demonstrated transfer of multi-dimensional entanglement states over 250 m of single-mode fiber, showing that an infinite number of two-dimensional subspaces could be realized. Each subspace could be used for sending information, or multiplexing information to multiple receivers…read more. Open Access TECHNICAL ARTICLE

Two photons are entangled, one in polarization and the other in orbital angular momentum — twisted light. Credit: Wits University

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