A team of physicists has entangled three photons over a considerable distance, which could lead to more powerful quantum cryptography.
demonstrated the protocol in the lab, though still on a small scale. That’s why three-way nonlocality will be so important. “You have in principle much more cryptographic power,” because these three-way connections cannot be simulated by cobbling together a few two-way links.
Besides cryptography, multiparty entanglement also opens up possibilities for other types of quantum networks. Researchers like Guha are working on a, which could link up quantum computers the way the regular internet connects ordinary devices. This system would bring together the computing power of many quantum devices by connecting millions of particles with varying levels of entanglement across varying distances.
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