arXiv subjects

Ri-Yao Song

Publications and source records attributed to Ri-Yao Song.

3 recordsLinked to original sources

arXiv2026

Bandwidth-Tunable Quantum Light Source at 1.5 $μ$m

Quantum light sources constitute a crucial physical resource for the construction of quantum networks. Despite remarkable recent progress, there remains a lack of systematic investigation into the bandwidth tunability of quantum light sources under fixed waveguide parameters. In this work, we demonstrate a broadband quantum light source in the 1.5 $μ$m band with tunable bandwidth by changing the temperature of a piece of periodically poled lithium niobate waveguide. In our demonstration, the bandwidth of the quantum light source is tuned from 78.3 nm to 96.2 nm with a temperature change of 1 $^\circ$C . Under different bandwidths, the generation rates of correlated photon pairs are greater than 6.3 MHz with coincidence-to-accidental ratios consistently being no less than 608. The energy-time entanglement properties are measured by using the Franson interference with two-photon interference visibilities larger than 99.06%. Our results provide an effective method for developing the quantum light sources with tunable bandwidth which has great potential for building the large-scale quantum networks.

quant-ph↗

arXiv2026

Quantum teleportation over a field-deployed hollow-core fibre network

When a photon and one member of an entangled photon pair are jointly projected onto a Bell-state measurement (BSM), the quantum state of the photon can be transferred to the distant partner of the pair without physically transmitting this information carrier. In real-world deployment, however, teleportation performance is fundamentally bottlenecked by quantum channel impairments, such as loss, noise, and fluctuations, which induce severe decoherence and degrade fidelity. This vulnerability is further exacerbated in scenarios with intense classical data traffic or background light. Realizing scalable quantum networks, therefore, hinges on developing advanced channel architectures capable of supporting both high-fidelity quantum operations and high-capacity classical communications within a shared infrastructure. Towards this end, hollow core fibre (HCF) offers a promising quantum channel resource by combining free-space-like weak light-matter interaction with the stability of fibre-based systems. Here, utilizing a field-deployed metropolitan HCF network spanning three spatially separated nodes in Chengdu, we achieve quantum teleportation with an intermediate BSM under co-propagating classical traffic. Crucially, the HCF links preserve the long-term indistinguishability of photonic qubits without active stabilization, and exhibit a Raman noise approximately three orders of magnitude lower than that of standard solid-core counterparts. This noise suppression enables robust quantum teleportation even alongside classical launch powers up to 160 mW. Our findings establish a classical-data-compatible framework for quantum networking over deployed fibre infrastructure and offer a wavelength-agnostic, plug-and-play, and free-running pathway toward the quantum internet.

quant-ph↗

arXiv2026

Quantum Teleportation toward the Quantum Internet: A Concise Review

Quantum networks play a pivotal role in quantum information science, which not only provide a secure communication platform for remote access to quantum computers but also serve as the strategic core for achieving large-scale quantum information processing, forming the foundational infrastructure for the future global-scale quantum internet. Quantum teleportation, which enables the transmission of unknown quantum states over long distances by employing quantum entanglement together with classical communication, is essential for the distribution of quantum resources in the construction of the global-scale quantum internet. To realize a global-scale quantum internet, quantum repeater protocols represent one of the most promising approaches for enabling quantum communication between any nodes. This concise review presents representative experimental demonstrations of quantum teleportation for constructing quantum networks across different physical platforms. Along this trajectory, the review discusses current challenges, open issues, and future perspectives toward scalable and practical quantum internet.

quant-ph↗