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    Chip-to-Chip Quantum Photonic Controlled-not Gate Teleportation

    Lan-Tian Feng1,2,3, Ming Zhang4, Di Liu1,2,3, Yu-Jie Cheng1,2,3, Xin-Yu Song1,2,3, Yu-Yang Ding5, Dao-Xin Dai4, Guo-Ping Guo1,2,3, Guang-Can Guo1,2,3 et al.

    Xi-Feng Ren1,2,3,*

    • *Contact author: renxf@ustc.edu.cn

    Phys. Rev. Lett. 135, 020802 – Published 8 July, 2025

    DOI: https://doi.org/10.1103/d53g-v8q6

    Abstract

    Quantum networks provide a novel framework for quantum information processing, significantly improving system capacity through the interconnection of modular quantum nodes. Beyond the capability to distribute quantum states, the ability to remotely control quantum gates is a pivotal step for quantum networks. Here, we implement high-fidelity quantum controlled-not (cnot) gate teleportation with high-dimensional path encoded silicon photonic integrated circuits. Based on on-chip generation of the path-entangled quantum state, cnot gate operation, and chip-to-chip quantum photonic interconnect, the cnot gate is teleported between two remote quantum nodes connected by the single-mode optical fiber. Equip with 5 m (1 km)-long interconnecting fiber, quantum gate teleportation is verified by entangling remote qubits with 95.69%±1.19% (94.07%±1.54%) average fidelity and gate tomography with 94.81%±0.81% (93.04%±1.09%) fidelity. These results advance the realization of large-scale and practical quantum networks with photonic integrated circuits.

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