#QuantumTeleportationOverInternet

[govindhtech]

Quantum Teleportation Over Internet For Future Connectivity

Unified Quantum-Classical Networks Made Possible by Quantum Teleportation Over Congested Internet Cables.

Internet quantum teleportation

Quantum teleportation across a fibre optic cable carrying Internet communications was achieved by Northwestern University engineers. This critical invention allows quantum communication to be integrated with present Internet connections, decreasing the infrastructure needed for quantum computer and sensing applications.

The study's chief researcher, Northwestern McCormick School of Engineering electrical and computer engineering professor Prem Kumar, said the team was happy. Our research “shows a path towards next-generation quantum and classical networks sharing a unified fibre optic infrastructure,” “opening the door to pushing quantum communications to the next level”. Results were published in Optica.

Knowing Quantum Teleportation

Quantum teleportation allows remote network users to exchange information quickly and safely without direct transmission. The approach uses quantum entanglement instead of particle movement. This approach connects two particles so that their states instantly affect each other regardless of distance.

In optical communications, all signals become light. Quantum information uses single photons, while conventional signals use millions of light particles. The quantum state of one photon entangled with another is transferred to the other photon after a destructive measurement. can be extremely far away,” said paper first author Jordan Thomas, a Ph.D. candidate in Kumar's lab. Thus, “the photon itself does not have to be sent over long distances, but its state still ends up encoded onto the distant photon”.

The quantum state of an object is delicate, like “fairy floss in a spring shower,” and electromagnetic waves or particle movement can melt it into reality, causing decoherence if left unprotected. Single photons are fragile and difficult to transport over internet-clogged optical links.

Digital Highway Navigation: The Breakthrough

Researchers have struggled to prove quantum teleportation works in wires already full of regular communications. The delicate entangled photons would usually be “drown[ed] among the millions of other light particles,” like “a flimsy bicycle trying to navigate through a crowded tunnel of speeding heavy-duty trucks.”

Kumar and his team protected these vulnerable photons from excessive traffic. They planned:

Light scattering in fibre optic cables is thoroughly studied.

Finding a “judicial point where that scattering mechanism is minimized” allows photons to be placed in a less congested light wavelength, such as 1290 nm for the O-band. This option reduces high-power classical light noise from spontaneous Raman scattering (SpRS).

Special filters reduce Internet traffic noise. Uncorrelated SpRS photons are rejected by narrow-band spectro-temporal filters.

Due to careful tuning, they could communicate quantumly “without interference from the classical channels that are simultaneously present”.

Experiment and Impressive Results

To test their unique approach, researchers erected a 30-kilometer fibre optic network. They simultaneously transmitted 400-Gbps C-band Internet traffic at 1547.32 nm and quantum data. Using a Bell State Measurement (BSM), they performed quantum measurements at the halfway point for teleportation.

Results were overwhelming: “even with busy Internet traffic whizzing by,” quantum information was delivered. Teleported qubits had 89.9% fidelity and transmitted 74 mW of C-band classical power, according to the study. This study shows non-classical teleportation alongside high-rate conventional communications, exceeding the 2/3 fidelity limit of classical-physics-based techniques.

Even with high classical power, Hong-Ou-Mandel interference and entanglement distribution continued.

Future Prospects: Unified Internet

A quantum-connected computing network and quantum technologies in normal networks are made possible by this demonstration. “It won't have to build new infrastructure” if wavelengths are chosen appropriately because classical and quantum communications can coexist on current fibre.

Numerous effects include chances for:

Secure quantum applications without infrastructure.

Safe quantum communication between geographically dispersed nodes.

Their device can include more complicated quantum processes like entanglement swapping using two pairs of entangled photons.

Real in-ground optical cable tests coming up.

This book provides a “toolkit for measuring, monitoring, encrypting, and calculating the world like never before, without needing to reinvent the internet to do it”. By ensuring that complex multi-photon/multi-node quantum network applications may be implemented anywhere in the fibre infrastructure, it makes sophisticated quantum applications more accessible and viable.