Quantum teleportation through internet cables is possible: here's how it works

A team of engineers fromNorthwestern University performed the first demonstration of quantum teleportation through fiber optic cables that already carry Internet traffic. This advance, published in the journal OPTICALpaves the way for combining quantum communication with existing fiber optic infrastructuressignificantly simplifying future applications of quantum computing and advanced technologies. “Our work shows a path toward next-generation quantum and classical networks sharing a unified infrastructure,” commented Prem Kumarhead of the study.

Quantum teleportation allows share information lightning-fast and securely between remote users, without the need to transmit data directly. This phenomenon exploits quantum entanglement, a technique that connects particles despite the distance between them. As Kumar explained, while conventional communications use millions of particles of light, quantum information uses individual photons. “Teleportation allows the exchange of information without having to physically travel long distances,” detailed Jordan Thomasco-author of the study.

Before this discovery, many doubted the viability of quantum teleportation in cables with classical traffic, since the entangled photons would get lost among millions of light particles. However, Kumar's team identified less crowded wavelengths to place photonsin addition to adding filters that reduce noise generated by Internet traffic. “We place our photons at a strategic point where the scattering mechanism is minimized,” explained Kumar.

Conventional infrastructures can be exploited

To test the method, the researchers used a 30-kilometer fiber optic cable with a photon at each end, sent quantum information and traffic simultaneously at high speed, and confirmed that quantum information arrived intact at its destination after applying a quantum measurement protocol. “This work demonstrates the coexistence of quantum and classical communications in optical fiber,” emphasized Thomas.

Next steps include extending the experiments to greater distances and testing with cables installed underground. “If we choose the wavelengths well, there will be no need to build new infrastructure,” Kumar concluded, sounding optimistic. “Classical and quantum communications can coexist. »