Quantum communication security problem solved?
Fiber optic network security USES quantum communication to exchange information.
Governments and other organizations around the world have been investing in and developing technologies related to quantum communication and related encryption methods in search of better security during data transmission.
Researchers are working on these new systems that could theoretically provide reliable communication channels.
Implement how to integrate into existing and future fiber optic networks.
Quantum communication is a new communication method that USES quantum entanglement effect to transmit information.
Quantum communication is a new interdisciplinary subject developed in the last twenty years, which is a new research field combining quantum theory and information theory.
Quantum communication mainly involves quantum cryptography communication, quantum remote state transmission and quantum dense coding, etc. Recently, this discipline has gradually moved from theory to experiment and developed to practice.
More and more people pay attention to the efficient and safe information transmission.
Based on the basic principles of quantum mechanics, it has become the research hotspot of quantum physics and science in the world.

Research by the national institute of information and communications technology in Japan, including senior visiting researcher Tobias a. Eriksson, is expected to address one of the main challenges of the application: how to achieve secure communication using continuously variable quantum key distribution.
This method, usually abbreviated as QKD, is the continuous exchange of encryption keys generated by quantum technology, which is used to encrypt data transmitted between two or more parties.

In a paper to be presented March 3, solstice, 7 at OFC: fiber optic communications conference and exhibition in San Diego, California, riksson and his colleagues say the main obstacle to this application is the noise produced by fiber optic amplifiers.
Generation single mode optical fiber system.
Their research involves exploring the use of multi-core optical fiber technology that is expected to be used in future transmission networks.
As the name suggests, a multicore fiber optic system USES multiple fiber cores in a single strand through which data can be transmitted.
In today’s fiber-optic networks, each line usually has only one core.
“Secure communication is one of the most difficult challenges, and many current encryption methods could one day be easily broken by algorithms designed specifically for quantum computers,” erickson said.
“One reason we haven’t seen a commercial deployment of QKD is that the technology is not compatible with the current network architecture.”

Eriksson says researchers are studying how to use the technology to solve encryption problems as multicore fibers are deployed in the future.
“The question we asked ourselves was whether the spatial dimensions of the multi-core fiber could be used for the co-propagation of classical and quantum signals,” erickson said.
“We found that classical channels can completely ignore quantum signals, because amplifier noise kills quantum channels, so that’s not possible in single-mode fiber.”
Eriksson’s team used a 19-core optical fiber to measure excess noise in crosstalk between classical and quantum channels.
They found that it was possible to support 341 QKD channels with wavelengths of 1,537 nm and 1,563 nm spaced at 5 GHz.

The team’s work is outlined in a paper to be presented at the OFC conference in San Diego.
When quantum channels use dedicated cores of multi-core optical fibers, network operators can avoid core-to-core crosstalk noise between classic channels carrying data by ensuring that the wavelength of quantum signals from QKD is in the protection band, the team reports.
This simple solution solves the multiplexing problem of quantum and classical channels and avoids introducing new components for classical communication channels.