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I still do not understand, as they do not carry Qubits, but they use laser to transmit information, why not use the laser in the first place to transmit information?

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I would like to know what kind of interesting mind downvotes question?!

couldn’t find a reference to laser in the article; where did you read this?

Lasers are mentioned in the linked arXiv paper: https://arxiv.org/abs/1707.00934

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