Scientists at the Chinese Academy of Sciences have developed a new method for high-capacity, secure quantum communication using qudits, promising a powerful quantum internet. Unlike traditional qubits, which encode information in a state of 0, 1, or both, qudits operate in higher dimensions, enabling greater data transmission.
The technique utilizes spatial mode and polarization properties of light to create four-dimensional qudits on a specialized chip, resulting in faster data transfer and enhanced error resistance. This method is particularly advantageous for satellite-based quantum communication due to its ability to maintain quantum properties over long distances.
The process involves generating an entangled state with two photons, where one photon is manipulated to form a 4D qudit, while the other acts as a remote control. This allows scientists to control and encode information onto the qudit.
This breakthrough could revolutionize quantum communication, paving the way for a high-speed, secure quantum internet. It also has the potential to develop unbreakable encryption protocols and contribute to advanced quantum computers. Researchers are now focusing on improving qudit accuracy and scaling up the technology for even higher dimensions.
Featured image: (a) The experimentally retrieved (upper row) and theoretically predicted (lower row) density matrices of two selected quantum states. (b) Theoretically (left panel) and experimentally retrieved (right panel) probability-of-detection matrix. Credit: Chinese Academy of Sciences
