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Imagine having your MRI results sent directly to your phone, with no concern over the security of your private health data. Or knowing your financial information was safe on a server halfway around the world. Or sending highly sensitive business correspondence, without worrying that it would fall into the wrong hands.

Thanks to new research from a team of Univ. of Toronto engineers, these types of perfectly secure information exchanges are one step closer to reality. Published in Nature Communications, researchers have designed the first all-photonic quantum repeaters—protocols that ensure data can be carried reliably and securely across longer distances when using quantum cryptography.

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