A new turn on quantum communication in optical fiber

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New research done at the University of the Witwatersrand in Johannesburg, South Africa, and Huazhang University of Science and Technology in Wuhan, China, has exciting ramifications for secure information transfer across optical fiber networks. The group has exhibited that different quantum patterns of twisted light can be transmitted over an ordinary fiber link that, incomprehensibly, supports just one pattern. The suggestion is a new way to deal with realizing a future quantum network, harnessing different dimensions of entangled quantum light.

Science Advances published the research by a group led by Professor Andrew Forbes from the School of Physics at Wits University in collaboration with a foreman by Professor Jian Wang at HUST. In their paper, titled “Multi-dimensional entanglement transport through single-mode fiber,” the analysts exhibit a new paradigm for realizing a future quantum network. The group indicated that various patterns of light are available after a communication link of conventional optical fiber that paradoxically can just help a single pattern. The group accomplished this quantum trick by engineering entanglement in two degrees of freedom of light, polarization, and pattern, passing the polarized photon down the fiber and getting to the numerous examples with the other photon.

“In essence, the research introduces the concept of communicating across legacy fiber networks with multi-dimensional entangled states, bringing together the benefits of existing quantum communication with polarized photons with that of high-dimension communication using patterns of light,” says Forbes.

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