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    Critical Thought

    Critical thoughts on quantum technologies

    Quantum Communications Testing Breaks New Ground with UK-Ireland Link

    BySam Figg

    Nov 16, 2023
    Quantum Communications Testing Breaks New Ground with UK-Ireland Link

    Bits of data have successfully been transmitted using quantum cryptography from the UK to the Republic of Ireland, marking a significant milestone in quantum communications research. In this groundbreaking test, researchers utilized a fiber optic cable called Rockabill, which runs beneath the Irish Sea, to overcome the long-standing issue of data leakage in quantum technology. By employing sensitive detectors at the cable endpoint, the team was able to secure the transmission of data.

    The network, spanning 224km between Portrane in Ireland and Southport in the UK, is owned and operated by euNetworks, a leading infrastructure provider. It is one of the most advanced commercial optical fiber systems in the region. This underwater deployment of quantum communications, using the longest stretch of fiber-optic cable to date, aimed to address the challenge of data corruption and leakage over long distances, thereby paving the way for the future establishment of a quantum internet.

    Quantum communications leverage the unique properties of light particles, or photons, to transmit data along optical cables. These particles exist in a delicate state, collapsing when subjected to external interference in an attempt to manipulate or steal information. However, over extended distances, the data can deteriorate and leak, leading to corruption. Professor Marco Lucamarini, research lead from the University of York team, explains that the higher the distance, the greater the likelihood of photon loss, absorption, or scattering, which diminishes the likelihood of information reaching its intended recipient.

    This distance issue poses a significant challenge for organizations seeking to securely transmit private data across borders, particularly for countries like the UK that rely on underwater cables to connect with mainland Europe or the US. To tackle this problem, Professor Lucamarini and his team capitalized on the new cable system between Southport and Portrane.

    The design efficiencies incorporated into the cable played a vital role in enhancing the quality of data transmission. With a fully fiber-optic end-to-end connection and highly sensitive detectors at the Southport endpoint, the interference was significantly reduced, resulting in a more efficient transfer of data at the speed of light. “This is a truly exciting step forward in realising the full potential of quantum communications and for the future of securing private data in an environment that is shaping the so-called ‘quantum internet’,” Professor Lucamarini expressed.

    Additionally, by conducting the experiment using a commercial-grade cable, the researchers were able to advance the integration of quantum communication technology into existing global telecommunications infrastructure. The ability to access quantum-secure data is critical for the future of information security, with the increasing risk of logical quantum computers being able to breach existing encryption methods and compromise stored and transmitted data.

    The successful demonstration of quantum technology over long distances using commercial-grade fiber optic infrastructure opens up new possibilities for network security and infrastructure advancement. Paula Cogan, CEO of euNetworks, emphasized the implications of this experiment, stating that it pushes the boundaries of quantum technology and will serve as a catalyst for enhancing and innovating future network infrastructure.

    As quantum computing continues to develop and poses threats to traditional encryption methods, further experiments will be conducted on the same line to test various aspects of quantum cryptography, communications, and data transmission. In addition to the UK-Ireland link, experiments are also being carried out in and around London to secure data transmission between banks and data centers. These efforts are part of a broader project led by BT to create a quantum network in the capital, connecting financial institutions to their server halls.

    Frequently Asked Questions (FAQ)

    1. What is quantum communications?

    Quantum communications is a field that utilizes the properties of photons to transmit data in a secure manner. It relies on the principle that light particles can be manipulated and measured in specific quantum states, making it extremely difficult for unauthorized parties to intercept or tamper with the transmitted information.

    2. Why is the distance a challenge in quantum communications?

    Over long distances, the delicate quantum states of the photons used for communication can deteriorate, leading to data corruption and leakage. Maintaining the integrity of quantum communication becomes increasingly challenging as the distance between the sender and recipient increases.

    3. How does sensitive detection overcome data leakage issues?

    Sensitive detectors are critical in quantum communications as they can accurately measure the quantum states of transmitted photons. By employing highly sensitive detectors at the cable endpoint, researchers were able to minimize interference and ensure the secure transmission of data.

    4. What are the implications of quantum communications for network security?

    Quantum communications offer unparalleled possibilities for enhancing network security. As traditional encryption methods become vulnerable to quantum computing, which can easily compromise encryption algorithms, quantum technologies provide a future-proof solution for protecting sensitive information transmitted over networks.

    5. What is the “quantum internet”?

    The “quantum internet” refers to a hypothetical network that utilizes quantum technologies for secure communication and data transmission. It is envisioned to offer unprecedented levels of security and enable new applications based on quantum principles. Although still in its early stages, advancements in quantum communications are paving the way for the development of a quantum internet.

    (Sources: source1.com, source2.com)