The 6G communication can use terahertz radiation.

"Tohoku University researchers have developed a tunable filter for terahertz wave signals, facilitating higher transmission rates and improved signal quality. This breakthrough, crucial for the advancement of terahertz applications in communication, medical imaging, and industrial analysis, promises to unlock the full potential of terahertz waves across various fields." (ScitechDaily, Unlocking the Future of 6G: A New Breakthrough in Terahertz Communication)

The world is going to be mobile. And that means there is always a need for new and faster mobile networks. The problem with data networks is that even if 4G and 5G are fast. Mobile applications always turn harder and harder. More and more mobile applications like cell phones connect to mobile networks. And that thing increases the need for data transportation capacity. 

In the future, all TV sets and even houses use wireless data transmission because data cables are expensive. It's cheaper and easier to install long-range wireless mobile hotspots than to install optical cables to the house. And the next-generation data communication solution can be a Starlink-based satellite solution. 

"Schematic concept of the developed tunable filter. (a) Cross-sectional view of the filter; (b) relationship between period and refractive index; (c) frequency shift due to the change of refractive index. Credit: Ying Huang et al." (ScitechDaily, Unlocking the Future of 6G: A New Breakthrough in Terahertz Communication)

The ability to filter terahertz radiation means that the next-generation data communication networks might use terahertz radiation for data transmission. The biggest problem with using terahertz radiation has been filtering that radiation. The problem is how to make data transmission between multiple mobile systems using the same frequency is solved. 

The system equips every data package with the identifier. That allows the router to route those data packages into a certain device. And other ways that identifier makes the receiver reject those data bites. After that, the device collects those data bites into one entirety. 

The ability to put a serial number to those data bites makes the network more flexible and more secure. The system can use different routes to send the package and the serial number allows the receiver to collect data in its entirety even if the system uses radio- and optical communication at the same time. 

"The mechanically refractive index variable metamaterial. Credit: Ying Huang et al." (ScitechDaily, Unlocking the Future of 6G: A New Breakthrough in Terahertz Communication)

In that model missing serial number tells the system that there are missing data bites. And the transmitter can send those missing bites again. That saves the network and releases its capacity for something else. 

But the other thing is how to protect data against physical damage. When two electromagnetic fields with different frequencies impact those fields start to disturb each other. That thing is problematic because the system must remove the artifact, the non-controlled part from it. If some outcoming waves hit electromagnetic fields, they act like a jammer system. Those outcoming waves destroy the data from the field. 

There is one problem with radio communication. The problem is that there is a limited number of radio frequencies. And terahertz radiation helps that problem by offering new frequencies for communication systems. The terahertz radiation is a new frequnéncy for communication. And the terahertz networks can be the solution for the next-generation data transmissions. 

https://scitechdaily.com/unlocking-the-future-of-6g-a-new-breakthrough-in-terahertz-communication/

Quantum networks can make the world more secure.

"The 100-kilometer fiber optic cable through which a team of researchers at DTU has successfully distributed a quantum-encrypted key securely. Credit: DTU" (ScitechDaily, An Unprecedented 100 km – Researchers Set New Distance Record With Quantum Keys) 

Researchers made new records. They exchange quantum keys securely within 100 km. And that is the next step for ultra-secured data transmission. The networks are unable to operate if they are not secured. The cornerstone for secure communication is that the systems can exchange keys securely. 

The neurocomputer requires ultra-secure communication. 

The new findings are a big advantage to developing quantum networks. 

The difference between quantum networks and regular networks is that in quantum networks, information travels in qubits. The quantum network's problem is that the system packs information in the physical object. And that makes quantum computers resistant to regular eavesdropping. 

However, the quantum computer is vulnerable to outside effects. In quantum networks, information travels in quantum channels like nanotubes or hollow laser rays. When the quantum network sends information over long distances. It creates the quantum channel using phonon- or acoustic lasers to make the hollow channel through air. Then the system shoots hollow laser rays through it. And qubit can travel through that channel. 

The quantum network is not a synonym for a quantum computer. The quantum computers use quantum networks in their processors. However, the quantum network can transmit information between binary computers, as well as, the quantum network transports information between quantum computers. 

"Researchers from the Institute of Industrial Science, The University of Tokyo have solved a foundational problem in transmitting quantum information, which could dramatically enhance the utility of integrated circuits and quantum computing. Credit: Institute of Industrial Science, The University of Tokyo" (ScitecchDaily, Redefining Quantum Communication: Researchers Have Solved a Foundational Problem in Transmitting Quantum Information)

There are three main types of quantum networks. 

1) All quantum networks. Those systems transport all data in quantum mode. 

2) Hybrid quantum networks. Those networks send only encryption keys in qubits. The rest of the data travels in the form of regular electromagnetic signals. 

3) Virtual quantum networks. Those networks share data in multiple frequencies or multiple lines. The system shares information with multiple transportation lines using TCP/IP. Then it sends information at the same time. In this system, all data pack has a serial number. 

And that helps the receiving system to sort those received data packets into the right order without depending on their arrival order. So the system can mix those data packets into arbitrary order before sending them. Then receiving system can put them into the right order using those serial numbers. 

The quantum network allows ultra-secured communication between computers. And also another ultimate computing system called neurocomputer requires ultra-secured communication. In neurocomputers, the processor units can be at long distances from each other. 

Networked workstations can also act as neurocomputers. Theoretically is possible to transform the entire internet into a giant neurocomputer. The technical platform exists, but a lack of political willingness denies that kind of project. 

The quantum computer is a non-centralized data-handling tool. That system is multiple networked microprocessors. Just like quantum computers neurcomputer can drive multiple operations at the same time. The speed of those operations is not the same as quantum computers. But binary computers are less vulnerable to outside anomalies than quantum computers. 

The neurocomputer is not a synonym for neural networks. The neural network is the thing that interconnects sensors with computers. So a neural network is a sensory system the network that connects things like surveillance cameras with neurocomputers. 

https://scitechdaily.com/an-unprecedented-100-km-researchers-set-new-distance-record-with-quantum-keys/

https://scitechdaily.com/redefining-quantum-communication-researchers-have-solved-a-foundational-problem-in-transmitting-quantum-information/