New approach is a step toward using single photons in quantum communication and information processing. Researchers at the Los Alamos National Laboratory have developed a novel technique to generate a stream of circularly polarized single photons, crucial for quantum information and communication
Los Alamos National Laboratory scientists developed a new method for producing circularly polarized single photons, paving the way for advancements in quantum communication and a potential ultra-secure quantum internet. Credit: Los Alamos National Laboratory
“Our research shows that it is possible for a monolayer semiconductor to emit circularly polarized light without the help of an external magnetic field,” said Han Htoon, scientist at Los Alamos National Laboratory. “This effect has only been achieved before with high magnetic fields created by bulky superconducting magnets, by coupling quantum emitters to very complexphotonics structures or by injecting spin-polarized carriers into quantum emitters.
, the research team worked at the Center for Integrated Nanotechnologies to stack a single-molecule-thick layer of tungsten diselenide semiconductor onto a thicker layer of nickel phosphorus trisulfide magnetic semiconductor. Xiangzhi Li, postdoctoral research associate, used atomic force microscopy to create a series of nanometer-scale indentations on the thin stack of materials.
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