๐๐ช๐๐ฃ๐ฉ๐ช๐ข ๐๐๐๐๐ฃ๐ค๐ก๐ค๐๐ฎ ๐ฝ๐ง๐๐๐ ๐ฉ๐๐ง๐ค๐ช๐๐: ๐๐๐ซ๐ค๐ก๐ช๐ฉ๐๐ค๐ฃ๐๐ง๐ฎ ๐๐๐๐๐ฉ-๐ฝ๐๐จ๐๐ ๐๐ฃ๐๐ง๐ฎ๐ฅ๐ฉ๐๐ค๐ฃ ๐๐๐ฉ๐๐ค๐
Advancing Quantum Security A new encryption technique utilizes light frequencies, or colors, to encode quantum states. In eavesdropping-resistant quantum communication, only encoded quantum keys are exchanged between two users. Data security is under threat: in the future, quantum computers could instantly decode encrypted files sent over the Internet. Researchers are therefore experimenting with quantum networks and systems that could guarantee eavesdropping-resistant communication through quantum mechanical phenomena such as superposition and entanglement, and cryptographic quantum protocols.
๐๐ป๐ป๐ผ๐๐ฎ๐๐ถ๐๐ฒ ๐ ๐ฒ๐ฐ๐ต๐ฎ๐ป๐ถ๐ฐ๐ฎ๐น ๐๐ป๐ฐ๐ฟ๐๐ฝ๐๐ถ๐ผ๐ป At the Leibniz University Institute of Photonics in Hannover, researchers have developed a new entanglement-based quantum key distribution method. This quantum mechanical encryption technique uses different frequencies of light, or colors, to encode corresponding quantum states. The method, they say, increases security and resource efficiency.
๐ฅ๐ฒ๐๐ฒ๐ฎ๐ฟ๐ฐ๐ต๐ฒ๐ฟ๐ ๐๐ป๐ฎ๐ต๐ถ๐๐ฎ ๐๐ต๐ผ๐ฑ๐ฎ๐ฑ๐ฎ๐ฑ ๐๐ฎ๐๐ต๐ถ ๐ฎ๐ป๐ฑ ๐ ๐ถ๐ฐ๐ต๐ฎ๐ฒ๐น ๐๐๐ฒ๐ demonstrated entanglement-based quantum key distribution. "Our approach could enable the expansion of quantum networks while using fewer resources to connect more users across greater distances."
๐ ๐๐น๐๐ถ-๐๐ต๐ฎ๐ป๐ป๐ฒ๐น ๐๐ป๐ป๐ผ๐๐ฎ๐๐ถ๐ผ๐ป The researchers successfully measured quantum states of light particles using just one detector instead of four highly sensitive photon detectors. To perform the four required measurements, they used a frequency-to-time conversion method that maps frequency components to photon arrival times at the detector.
The method utilizes several channels simultaneously. This so-called adaptive frequency multiplexing increases the key distribution rate without requiring additional devices, and the quantum network performance dynamically adapts to current load conditions