Engineer Yu northwestern university By identifying specific wavelengths and with minimal interference from classical signals, quantum communication in parallel with classical channels has been successfully achieved (source: northwestern university). This breakthrough lays the foundation for quantum communications by leveraging existing infrastructure and sending quantum data alongside classical data. Researchers managed quantum teleportation through a 30.2-kilometer fiber-optic cable carrying 400 Gbps classical traffic.
Quantum computing seems to be all the hype these days. Google claim to be new Quantum chip Can quickly solve problems that would have taken a conventional computer 10 billion years to do; that’s 10 followed by 24 zeros. Quantum entanglement is a phenomenon in which two particles are interconnected such that their quantum states (spin, polarization, energy levels, etc.) are connected regardless of physical distance. When the state of one particle is measured, the entanglement collapses, revealing the associated state of the other particle. However, this cannot achieve FTL (faster-than-light) communication that complies with the no-communication theorem.
Enter quantum teleportation. This concept combines entanglement with classical channels such as networks and is the backbone of this research. It transfers the quantum state of one particle to another particle located elsewhere.
Jordan Thomas, one of the authors of the research paper, highlighted the nature of quantum teleportation; “By destructively measuring two photons – one carrying the quantum state and one entangled with the other photon – the quantum state is transferred to On the remaining photons, this could be very far away. “A key point to understand here is that photons are not physically transported. Instead, the message sent is one encoded in a quantum state.
The main issue with a global network using quantum teleportation is compatibility. Can quantum communication take place through classical channels? Among the billions of photons sent simultaneously in a fiber optic cable, the potential for interference is very high. The study discovered specific wavelengths where the density of classical photons is low, making such wavelengths suitable for photons in quantum teleportation. Bell state measurements, or simply state measurements, are made at the midpoint of the cable. Combined with other methods of reducing noise and interference, this approach has the potential to support multi-TB/s classical data as well as quantum communications.
While it may take years or decades for quantum communications to become mainstream, research team leader Prem Kumar has high hopes for the future. According to the current roadmap, the next major milestone is to use two pairs of entangled photons instead of just one and extend the experiment to real-world fiber optic networks.