RRI comes up with simulation toolkit to ensure safety in secure quantum communication platforms
The recent advisories by the Ministry of Home Affairs to ensure online communication via secure platforms have highlighted the increasing need for measures to ensure security in the virtual world as Covid-19 confines most day to day activities to the digital space.
The secure part of any information transfer protocol is in the distribution of the key used to encrypt and decrypt the messages. Such standard key distribution schemes, usually based on the mathematical resolution of problems, are vulnerable to algorithmic breakthroughs and the possibility to run new codes on the up and coming quantum computers. The solution to ensuring the security of the vital transfer process lies in using the laws of quantum physics. Any eavesdropping activity will leave tell-tale signs and hence be easily detected. It is achieved by using Quantum Key Distribution or QKD.
Researchers from Raman Research Institute (RRI), an autonomous institute of the Department of Science & Technology (DST), Government of India, have come up with a unique simulation toolkit to tackle this challenge end-to-end QKD simulation named as ”qkdSim”. It is based on modular principles that allow it to be grown to different classes of protocols using various underpinning technologies.
The research led by Prof. Urbasi Sinha and her team, in collaboration with Prof. Barry Sanders from the University of Calgary, Canada is a part of the Quantum Experiments using Satellite Technology (QuEST) project, India'sIndia's first satellite-based secure quantum communication effort, supported by the Indian Space Research Organisation (ISRO). This work is going to appear in the journal Physical Review Applied.
Their toolkit's novelty lies in its exhaustive inclusion of different experimental imperfections, both device-based and process-based. Thus their simulation results will match with actual experimental implementations to much better accuracy than any other existing toolkit, making it a QKD experimenter's best friend.
As QKD is proliferating in academic, industrial, government, and defense laboratories, this newly developed simulation toolkit, accompanied by an instructive application to the uniquely designed B92 experiment, will be hugely influential. The B92 is a QKD protocol, which uses single photons and associated laws of Physics like the Uncertainty Principle and the No-Cloning theorem to assure perfect security.
“Secure error free communication error-free are assuming extraordinary importance for which Quantum key distribution (QKD) is an attractive solution, which relies on a cryptographic protocol. A shared random secret key known only to the communicating parties is employed to encrypt and decrypt messages. A unique property of quantum key distribution is that any unauthorized party's break-in attempt is immediately detected. This is because any process of measuring a quantum system creates detectable anomalies,” said Prof Ashutosh Sharma, Secretary, DST.
The research work is two-fold in its novelty as well as process development. On the one hand, they have developed a simulation toolkit, which bridges a significant gap in the QKD community. On the other hand, they have performed a novel implementation of what is called a prepare and measure QKD protocol (B92), which has higher key rates and lower quantum bit error rate than earlier reported works following similar source methodology.
It is India's first end to end free space QKD experiment. It also has internationally competitive key rates and error rates. RRI team plans to follow this up by expanding the current scope of qkdSim to include entanglement based QKD protocols and experimental comparisons for the same. It can lead to a whole new software that will be highly beneficial to the experimental secure quantum communication community.
This first-of-its-kind practical tool will be indispensable in designing, setting up, optimizing, and evaluating experiments for demonstrating QKD and will engender further development to broaden the simulation tool's applicability. With the advent of the upcoming National Mission on Quantum Technologies and Applications, this work provides the bedrock for such developments in the country and will be of great interest.
Source: PIB Press Release ID: 1635294