Titled Quantum Laser Across the Sound (Q-LATS), the project aims to test free-space quantum communication that could herald the future of quantum networks.
Scientists have begun a new project to test shooting out three laser beams from a telescope atop Kline Tower on Yale University’s campus. Traveling 27 miles over Long Island Sound, the beams are expected to be received by a similar telescope housed on top of a hospital at Stony Brook University.
Scientists revealed that the aim of the project is to look to expand how quantum information can be sent and received, potentially setting the course for future quantum computing infrastructures.Quantum Laser Across the SoundResearchers revealed that positioned atop Kline Tower, a telescope will send entangled photons 27 miles across the Long Island Sound. Titled Quantum Laser Across the Sound , the project aims to test free-space quantum communication that could herald the future of quantum networks.“We want to exchange quantum information to show that a link is possible through free space,” said Hong Tang, Professor of Electrical and Computer Engineering. After that, they can test it out for other applications, from quantum cryptography to high-resolution images for astronomy to high-energy particle detection.Scientists have also revealed that Q-LATS can serve as an educational vehicle for students to grasp the rather uncanny nature of quantum science.Qubits flying over Long Island SoundIn a proposal for the project, Tang and his fellow researchers highlighted that the idea of qubits flying over Long Island Sound will incite the public’s curiosity in quantum sciences and help propel the next generation of engineers and scientists.A third partner in the project, Brookhaven National Laboratory, is linked to Stony Brook’s quantum network through fiber optics.Researchers revealed that the locations selected for the project are key, as in the United States, there are not many places like this with a body of water in between two major research institutions and between two different states.Pair of entangled photonsFor the project, they will generate a pair of entangled photons , then shoot them out over the Sound. If all goes right, they’ll still be entangled, according to a press release.“We keep one of them, and then we send the other through the laser over to the Stony Brook side,” said Mason Abrell , co-captain of the student team working with Tang on the project.Researchers also highlighted that, typically, quantum networks use fiber optic cables. Insulated and often underground, it’s a good way to get notoriously fragile qubits—bits of quantum information—to where they’re going. But fiber optics aren’t ideal for every network. There can be geographical limitations, and setting up a network can be pricey. Tang also underlined that scientists can’t use fiber optics to communicate with a satellite, or with an isolated island.Researchers revealed that with free space optics, in an urban area, scientists could go from roof to roof, which could be much easier than going underground or going under the ocean.Of course, a system involving lasers over Long Island Sound isn’t without its potential hiccups. There’s possible interference from fog, for instance. “We’re traveling 44 kilometers through free space, which means a lot of air attenuation, diffraction, just turbulence,” Abrell said. “It could be raining, and things like that.”
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