Researchers have made a significant discovery in quantum information transmission using particles of light called qudits, which can hold more data than traditional qubits due to their higher dimensions. This new technology could lead to a powerful and secure quantum internet for long-distance communication and the creation of advanced quantum computers and unbreakable encryption.
Unlike qubits, which can only exist in two states (0 and 1), qudits can exist in multiple states simultaneously. Qubits are commonly used in quantum computing but have limitations in data capacity. Qudits, with their higher dimensionality, can transmit more data in a single operation and make quantum systems more efficient.
The new technique uses light particles’ spatial mode and polarization to create four-dimensional qudits on a special chip for precise manipulation. This approach results in faster data transfer rates and increased resistance to errors compared to traditional methods.
Two photons are used to generate a special entangled state, where the particles become linked and share properties regardless of their physical separation. One photon (signal) is transformed into a 4D qudit using its spatial mode and polarization, while the other (idler) remains unchanged but can be manipulated to control the state of the signal photon and encode information onto it.
The potential applications of this technology include a high-speed quantum internet capable of transmitting large amounts of data securely over long distances, as well as the development of unbreakable encryption protocols and powerful quantum computers. Researchers are currently focusing on improving qudit accuracy and scaling up the technology for higher dimensions.
Understanding quantum mechanics is complex and may require a foundation in classical mechanics first. However, you don’t need to fully grasp classical mechanics before learning about quantum mechanics; instead, you can start with the basics of quantum theory and build upon that knowledge as you go. It is essential to take your time and work through the concepts step by step while consulting additional resources for clarification.
Source: https://scitechdaily.com/flying-qudits-unlocking-new-dimensions-of-quantum-communication/