A group of researchers from the QRate company, the Moscow Institute of Electronic Technology and Tomsk
Quantum key distribution is theoretically −the most reliable way to protect information. This technology uses quantum properties to encrypt and securely exchange information over open channels. Theoretically, with the help of quantum key distribution, the maximum degree of protection can be achieved, but in practice their operation depends on the quality of single photon detectors.
The vulnerabilities of these devices have been successfully exploitedto hack a secure connection. In a paper published in the IEEE Journal of Quantum Electronics, the researchers proposed a new way to measure afterpulses. This is a noise parameter that significantly affects the operation of devices.
The researchers analyzed six existingapproaches used to determine afterpulses. It turned out that all of them have an important drawback: with an increase in the number of photons in a pulse entering the detector, the number of noise increases, and the quality of measurements decreases. Scientists have proposed an alternative mathematical model and method for estimating the probabilities for afterpulses, which eliminates these shortcomings.
Our method allows us to increase the accuracy of measurementsnoise parameters, which is necessary for further error control. I am sure that the discovery will be useful both to the scientific community and industrial partners.
Anton Losev, head of the experimental group and the department for the development of QRate single photon detectors
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