First-ever quantum teleportation achieved on existing internet cables, potential for secure quantum communication without additional infrastructure.
In a novel development, engineers at Northwestern University have successfully demonstrated quantum teleportation using fibre optic cables already transmitting high-speed internet traffic. The feat represents a major step toward integrating quantum communication into existing network infrastructure, eliminating the need for dedicated quantum-specific cables.
The research showcases how quantum and classical data can coexist on a single cable. This advancement could revolutionise communication by enabling ultra-secure, high-speed information exchange for quantum computing and sensing technologies. The potential audience for such advancements spans industries like secure communications, data centres, and scientific research, which demand fast, confidential, and interference-free information sharing. “Our work shows a path towards next-generation quantum and classical networks sharing a unified fibre optic infrastructure,” said Prem Kumar, lead researcher and professor, Northwestern University.
Quantum teleportation leverages the phenomenon of quantum entanglement, where particles remain interconnected regardless of the distance between them. Through this, information can be transferred securely without the need for physical transmission. “By performing a destructive measurement on two photons, the quantum state is transferred to another photon located far away,” explained Jordan Thomas, a PhD researcher and first author of the study.
A significant challenge addressed by the team was managing quantum signals amid the dense traffic of classical communications. Delicate entangled photons risked being overwhelmed by conventional light signals. The researchers identified less congested wavelengths and implemented noise-reduction filters to ensure the quantum signals remained intact.
To validate their approach, the team tested their method on a 30km fibre optic cable. Quantum information and regular internet traffic were sent simultaneously, with the teleportation protocol successfully transmitting the quantum state. This marks the first demonstration of quantum teleportation over an active internet channel.
Future experiments aim to extend these results over longer distances and real-world infrastructure. Kumar remains optimistic, noting, “If we choose wavelengths carefully, we can achieve quantum connectivity without building new networks.” This innovation underscores the potential for combining quantum and classical technologies in shared environments, creating transformative possibilities in secure communication.
