Researchers from Imperial College London and universities in Southampton, Stuttgart, and Wurzburg in Germany have achieved a breakthrough by producing, storing, and retrieving quantum information for the first time. This development is crucial for networking in the field of quantum physics as the ability to share quantum information is essential for distributed computing and secure communication.
The team successfully interconnected key devices for quantum networking using regular optical fibers to transmit quantum data. This achievement was published in Science Advances. The researchers emphasized the importance of interconnecting devices to enable quantum networking and facilitate connections between distant locations and quantum computers. Unlike traditional telecommunications systems, quantum networks cannot use repeaters to amplify signals without risking the loss of quantum information.
To share quantum information over long distances, the researchers utilized entangled light particles or photons. These particles share properties in a way that one cannot be understood without the other. Creating and storing entangled photons for quantum networking requires devices that can generate and store them efficiently at the same wavelength. The team developed a system in which both the quantum dot light source and quantum memory device operated at the same wavelength, compatible with existing telecommunications networks. This allowed for efficient storage and retrieval of quantum information using normal fiber optic cables.
Although standalone quantum dots and memories have been created previously, this interconnection of devices at telecommunications wavelengths represents a significant advancement in quantum networking. The researchers will continue to improve the system by enhancing wavelength synchronization, prolonging photon storage time, and reducing the system’s size.
This breakthrough demonstrates progress in
