Amazing stuff!
"[researchers from the] University of Science and Technology of China used single-photon interference to establish entanglement between independent storage nodes for the first time, and based on this, they built the world's first metropolitan three-node quantum network based on entanglement. This work has increased the distance of the actual quantum entanglement network by three orders of magnitude from the previous tens of meters to tens of kilometers, laying a scientific and technological foundation for the subsequent development of quantum network applications such as blind quantum computing, distributed quantum computing, and quantum enhanced long baseline interferometry. ..."
From the abstract:
"Towards realizing the future quantum internet, a pivotal milestone entails the transition from two-node proof-of-principle experiments conducted in laboratories to comprehensive multi-node set-ups on large scales. Here we report the creation of memory–memory entanglement in a multi-node quantum network over a metropolitan area. We use three independent memory nodes, each of which is equipped with an atomic ensemble quantum memory that has telecom conversion, together with a photonic server where detection of a single photon heralds the success of entanglement generation. The memory nodes are maximally separated apart for 12.5 kilometres. We actively stabilize the phase variance owing to fibre links and control lasers. We demonstrate concurrent entanglement generation between any two memory nodes. The memory lifetime is longer than the round-trip communication time. Our work provides a metropolitan-scale testbed for the evaluation and exploration of multi-node quantum network protocols and starts a stage of quantum internet research."
中国科大构建国际首个基于纠缠的城域量子网络 (original news release, Google machine translation does the magic)
Creation of memory–memory entanglement in a metropolitan quantum network (no public access, but the article above contains link to PDF)
No comments:
Post a Comment