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Quantum secure direct communication (QSDC) is an important branch of quantum communication, based on the principles of quantum mechanics for the direct transmission of classified information. While recent proof-of-principle experimental studies have made remarkable progress; QSDC systems remain to be implemented in practice. In a recent study, Ruoyang Qi and co-workers at the departments of low-dimensional quantum physics, information technology, electronics and information engineering, proposed and experimentally implemented a practical quantum secure communication system.
In the work, Qi et al. analyzed the security of the system using the Wyner wiretap channel theory. The scientists developed a coding scheme using concatenation (interconnected) low-density parity-check (LDPC) codes in a realistic environment of high noise and high losses. The system operated with a repetition rate of 1 MHz across a distance of 1.5 kilometers and maintained a secure communication rate of 50 bps to send text messages, reasonably sized images and sounds. The results are now published in Light: Science & Applications.
Work - Qi - Al - Form - QSDC
The work by Qi et al. highlighted a form of QSDC that can transfer direct information without a distribution key to prevent vulnerability to attacks. In the work, the team used a 1550 nm laser to generate single photons that carried secure quantum information, the scientists were able to successfully decode the information upon receipt. The method was reliable even in realistic environments caused by high photon loss or errors introduced due to noise. The standard LDPC code that they used in the study for better error-correction performance was implemented by the Consulate Committee for Space Data Systems (CCDS) for near-earth and deep-space applications.
Global security depends on secure communication infrastructures. At present, communication is secured via encryption techniques such as the RSA public key scheme. The secrecy capacity is defined as the supremum of all achievable transmission rates with security and reliability. In...
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