Key Findings
A research team at the University of Science and Technology of China (USTC) has achieved a pivotal step towards the realization of a quantum internet, successfully generating entanglement between quantum memories over an unprecedented distance exceeding 420 kilometers. This accomplishment sets a new world record in this field and specifically includes the demonstration of remote memory-to-memory entanglement that persisted longer than its creation time, a crucial precondition for chaining quantum repeaters.
Technical Details & Breakthrough
The quantum internet aims to distribute entangled quantum states over vast distances for groundbreaking applications like Quantum Key Distribution (QKD), distributed quantum computing, and networked quantum sensing. One of the primary technical hurdles has been overcoming exponential photon loss during long-distance transmission and the lack of quantum repeaters capable of ‘remembering’ quantum states and re-emitting them on demand. The USTC team, earlier this year, successfully established entanglement between quantum memories—which hold quantum information in atoms—over an astonishing 420-kilometer optical fiber link. This technology is unique in its ability to store quantum states in atoms rather than in-flight photons. The breakthrough lies in demonstrating ‘memory-to-memory entanglement’ that survives for a duration longer than its creation time, which is essential for building a chain of quantum repeaters. This capability makes it theoretically possible to construct a global-scale quantum internet.
Background & Industry Context
The quantum internet promises to fundamentally overcome the limitations of current internet infrastructure regarding security, speed, and computational power. China has been a significant investor in quantum communication technologies for years, having already built the world’s longest terrestrial quantum communication network. This latest achievement by USTC further solidifies China’s leadership in quantum internet technology development. Advancements in quantum repeater technology are critical for overcoming the exponential distance limitations of quantum communication and accelerating the establishment of a practical, long-distance quantum communication network.
Strategic Significance & Outlook
The achievement of 420km quantum memory entanglement marks a decisive milestone towards the practical implementation of the quantum internet. This technology will dramatically enhance the security of quantum key distribution and, in the future, pave the way for linking multiple distant quantum computers to form more powerful ‘distributed quantum computers.’ It also forms the foundation for highly precise quantum sensing networks, with potential applications across scientific research, healthcare, and defense. The next challenges will involve further scaling this technology and constructing commercially viable quantum repeater networks to bring these transformative capabilities to widespread use.
Source: https://www.insidedeeptech.com/the-quantum-internet-a-full-guide/
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