Quantum networks have an inherent disadvantage: when two computers communicate using entangled photons, they disappear after just one use. Northwestern University physicists have released a new study that proposes a new strategy of adding bridges to enhance and maintain data transmission (communications) in a constantly changing, unpredictable quantum network.
Northwestern’s István Kovács, the study’s senior author, said, “Many researchers are putting significant efforts into building larger and better quantum communication networks around the globe.” “But, as soon as a quantum network is opened up to users, it burns down. It’s like crossing a bridge and then burning it down behind you. Without intervention, the network quickly dismantles. To tackle this problem, we developed a simple model of users. After each communication event, we added a fixed number of bridges, or links, between disconnected nodes. By adding a large enough number of links after each communication event, we maintained network connectivity.”