分类： 光学 >> 量子光学 提交时间： 2023-02-19
Guan-Jie Fan-Yuan
Feng-Yu Lu
Shuang Wang
Zhen-Qiang Yin
De-Yong He
Zheng Zhou
Jun Teng
Wei Chen
Guang-Can Guo
Zheng-Fu Han
摘要： Untrusted node networks initially implemented by measurement-device-independent quantum key distribution (MDI-QKD) protocol are a crucial step on the roadmap of the quantum Internet. Considering extensive QKD implementations of trusted node networks, a workable upgrading tactic of existing networks toward MDI networks needs to be explicit. Here, referring to the nonstandalone (NSA) network of 5G, we propose an NSA-MDI scheme as an evolutionary selection for existing phase-encoding BB84 networks. Our solution can upgrade the BB84 networks and terminals that employ various phase-encoding schemes to immediately support MDI without hardware changes. This cost-effective upgrade effectively promotes the deployment of MDI networks as a step of untrusted node networks while taking full advantage of existing networks. In addition, the diversified demands on security and bandwidth are satisfied, and network survivability is improved.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Lan-Tian Feng
Ming Zhang
Xiao Xiong
Di Liu
Yu-Jie Cheng
Fang-Ming Jing
Xiao-Zhuo Qi
Yang Chen
De-Yong He
Guo-Ping Guo
Guang-Can Guo
Dao-Xin Dai
Xi-Feng Ren
摘要： As an important degree of freedom (DoF) in integrated photonic circuits, the orthogonal transverse mode provides a promising and flexible way to increasing communication capability, for both classical and quantum information processing. To construct large-scale on-chip multimode multi-DoF quantum systems, a transverse mode-encoded controlled-NOT (CNOT) gate is necessary. Here, through design and integrate transverse mode-dependent directional coupler and attenuators on a silicon photonic chip, we demonstrate the first multimode implementation of a two-qubit quantum gate. With the aid of state preparation and analysis parts, we show the ability of the gate to entangle two separated transverse mode qubits with an average fidelity of $0.89\pm0.02$ and the achievement of 10 standard deviations of violations in the quantum nonlocality verification. In addition, a fidelity of $0.82\pm0.01$ was obtained from quantum process tomography used to completely characterize the CNOT gate. Our work paves the way for universal transverse mode-encoded quantum operations and large-scale multimode multi-DoF quantum systems.
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