Quantum communication relies on the ability to create and distribute quantum correlations, or entanglement. In one promising approach, entanglement is realized between continuous variables—such as the amplitude or phase of light. Over the past few decades, researchers have showcased key building blocks of continuous-variable quantum communication based on optical light. Now Baleegh Abdo and his colleagues at IBM Quantum in New York have extended those demonstrations to microwave radiation [1]. This work could help scientists attain long-distance quantum communication, secure quantum cryptography, and scalable quantum computing.
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