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Scientists at the University of Warsaw have developed a new method for quantum key distribution (QKD) that improves both efficiency and practicality of secure communications. The team applied a 19th-century optical phenomenon called the Talbot effect, which allows light patterns to reconstruct over distance, to sequences of single photons. This enables the encoding of information in multiple time-bin superpositions rather than simple qubits, significantly increasing data capacity. Their experimental system can operate in four dimensions using standard components and a single photon detector, eliminating the need for complex interferometer networks and frequent recalibration. Tests conducted over several kilometers of the university’s fiber network confirmed that the approach is viable and enhances information efficiency. Collaboration with international quantum cryptography experts also ensured that the system maintains security against potential vulnerabilities. This breakthrough demonstrates a practical, scalable way to implement high-dimensional quantum encryption, paving the way for more secure digital communication and advancing expertise in quantum photonics at the University of Warsaw.