On April 22, according to PHYS.ORG, the development of the quantum Internet ushered in a key step, and researchers from the United Kingdom and Germany recently produced, stored and retrieved quantum information for the first time. The ability to share quantum information is critical to the development of quantum networks for distributed computing and secure communication. Quantum computing will help solve important problems such as optimizing financial risk, decrypting data, designing molecules, and studying material properties. One way to mitigate the risk of loss of quantum information over long distances is to divide the network into smaller parts and connect them all with shared quantum states.
To do this, a quantum storage device must be able to "talk" to another device that can be used to create quantum information. For the first time, researchers from both countries have created a system that can connect these two key components, while also being able to transmit quantum data via conventional optical fibers. Co-first author Dr. Sarah Thomas, from the Department of Physics at Imperial College London, said, "Connecting two key devices together is a critical step in enabling quantum networks, and we are very pleased to be the first team to demonstrate this. Lucas Wagner, a researcher at the University of Stuttgart in Germany, who is also co-first author, added that allowing long-distance locations and even quantum computers to be connected will be a key task for quantum networks in the future. In ordinary telecommunications systems, such as network or telephone lines, information can be lost over long distances. To solve this problem, these systems use "repeaters" at fixed points to read and reamplify the signal, ensuring that the signal reaches its destination intact. However, classical repeaters cannot be used for quantum information because any attempt to read and copy the information will destroy the information. This is somewhat of an advantage, as quantum connections cannot be "eavesdropped" without destroying information and alerting the user. However, this is also a challenge for long-distance quantum networks. One way to overcome this problem is to share quantum information in the form of entangled photons. To share entanglement information over long distances over a quantum network, two devices are required: one to create entangled photons, and one to store entangled photons for later retrieval. The research team created a system that allows two devices to use the same wavelength. Quantum dots generate (non-entangled) photons, which are then passed on to a quantum storage system and stored in a cloud of rubidium atoms. Lasers can be used to "turn on/off" memory, allowing photons to be stored and released on demand. The wavelengths of these two devices are not only matched, but they are the same as those of the telecommunications networks in use today, allowing them to be transmitted over conventional fiber optic cables that are familiar to everyday Internet.
Source | IT House
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