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Indian-led Research Team Brings Quantum Internet To Reality | India News

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It sounds like something straight out of spy fiction. When someone interrupts a transmission and tries to intercept it, the message is destroyed. That’s the quantum Internet, which is based on the laws that govern quantum mechanics, with the promise of “un-hacked” transmissions. For four decades, there has been continuous progress in the field, but what has remained elusive is scale: connecting more than two devices in a quantum network has been overwhelming. For the first time, a group of scientists has found a scalable process, connecting eight devices in a quantum network in Bristol.
“This is the largest entanglement-based quantum communication network. Multinodal networks like this have not been built before, ”said Siddarth Joshi from the University of Bristol Quantum Engineering Technology laboratory, who led the study with a team of 15 under the UK National Center for Quantum Communications project. “We have been able to show this on a city-wide scale. Think about how we can start connecting cities. Could we link this to a satellite? These are the things we want to do. ”
Quantum networks use particles of light, called photons, to communicate. It is based on a process called entanglement. “Tell me, I have a deck of cards and you have another. You pick a card at random, me too. These are different decks. The card you choose has no correlation with the one I choose, ”Joshi explained. “But if the decks are ‘tangled’, the card you choose would be identical to the one I make.”
What has held back large-scale networking is the technology on which it has been based so far. Trusted nodes. “It’s like having walkie talkies for children. One team talks to another, and if you want to send a message to a third person, you have to listen to the message on a walkie-talkie and repeat it on the other, ”Joshi explained. So if eight people wanted to communicate, they would need 56 walkie-talkies, one for each of the other seven on the network.
Joshi and his team thought there might be a solution: wavelength multiplexing. “You take the light, you divide it based on its color (that is, the wavelength), so now you have a lot of entangled states. Distribute the different wavelengths to multiple users. You do this simultaneously and everyone can talk to everyone else, ”he said. Today’s computers use the RSA (Rivest-Shamir-Adleman, named after the developers) protocol to encrypt and decrypt messages.

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