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APPARATUS AND METHOD FOR PERFORMING QUANTUM SECURE DIRECT COMMUNICATIONS BY USING TIME BIN AND POLARIZATION IN COMMUNICATION SYSTEM

Resumen de: WO2026127158A1

The objective of the present disclosure is to perform quantum secure direct communication by using a time bin and polarization in a communication system. The method may comprise the steps of: acquiring system information; performing a random access procedure on the basis of the system information; generating a first signal; transmitting the first signal to a second device; receiving, from the second device, a second signal on which encoding has been performed using the first signal; and decoding the second signal.

MAINTENANCE OF ESTABLISHED, PAIRWISE QUANTUM ENTANGLEMENT BUFFERS FOR EFFICIENT QUANTUM ENTANGLEMENT DISTRIBUTION

Resumen de: WO2025221285A2

Techniques for generating and maintaining a buffer of on-demand, pairwise quantum entanglement instances using programmable optical switchboard architectures within quantum repeaters are disclosed. A rate of establishing pairwise quantum entanglement instances between quantum repeaters of a quantum entanglement network may be higher than both a rate of decay of said instances and a rate of consumption of said instances for providing distributed quantum entanglement, such that on-demand distribution of quantum entanglement may be provided for customers. Furthermore, an optical switchboard with a given quantum repeater may be configured to route between any of the quantum memory locations provided within the quantum repeater, such that an optimization of the usage of such buffers of quantum entanglement instances may be ensured.

SINGLE-PHOTON LIGHT SOURCE

Resumen de: EP4761145A1

The present invention relates to a single photon light source capable of generating single photons with a high repetition rate and a high collection efficiency by positioning an emitter in a nanogap of a nano-antenna including a metal nanoparticle and a metal layer, and by controlling Purcell enhancement in the nanogap.The single photon light source of the present invention is easy to manufacture with low manufacturing costs due to its simple structure and has excellent light collection efficiency by emitting single photons vertically upward through an optical antenna structure of a nano-antenna. In addition, single photons may be generated by applying various emitters to a nano-antenna, a high production yield is obtained due to the wide bandwidth, and operation may be possible at room temperature at various wavelengths.

Distributed quantum computing

Resumen de: GB2702580A

A distributed quantum computing system 100, e.g. a quantum memory, comprises: quantum computing units 102 of qubits; quantum networking units 104, each coupled to qubits on the quantum computing units and being configured to selectively couple each qubit to a fixed number of outputs; entanglement units 106, each having inputs to receive signals from the quantum networking units 104 and configured to entangle the received signals; a fixed coupling network 110 comprising predefined network pathways between outputs of the quantum networking units and the inputs of the entanglement units; and a control system 108 configured to control the plurality of the quantum networking units 104 to entangle qubits of the quantum computing units according to a topology associated with an error correcting code. The networking units 104 comprise photonic integrated chips to selectively couple each qubit to the fixed number of outputs. Network pathways may comprise optical fibers. The topology may be divided into tiles with connections such that the number of connections between tiles is minimised. Entanglement units 106 comprise performing Bell state measurements. The error-correcting code may be: low-density parity-check, qLDPC; hyperbolic or semi-hyperbolic; Floquet. figure 1

量子鍵配送の較正設備およびその方法

Resumen de: EP4465555A1

0001 The present invention relates to Calibration system for calibrating a QKD emitter comprising said QKD emitter provided with a light source for generating light and an output connector for exiting the generated light, and a telecom characterization setup located at the output connector characterized in that the calibration system further comprises a pair of switchable connectors adapted to be switched between a first position where the connectors are exposed to the outside of the QKD emitter and a second position where the connectors are internally connected for providing a light path from the light source to the output connector, and an optical amplifier (5) connected to the connectors switched in the first position for calibration procedure.

荧光攻击检测方法、装置以及量子通信系统

Resumen de: CN122226247A

本申请提供了一种针对量子通信系统的荧光攻击检测方法、装置以及量子通信系统，通过荧光攻击检测装置中的各模块对待检测设备进行测试光信号接入前以及测试光信号接入后进行自动化的计数信息的采集，并基于检测得到的本底计数信息、峰值计数信息、测试计数信息以及基准端口反射位置，实现对待检测设备的荧光攻击检测以及荧光泄漏率的计算以及安全性评估。本申请实现了对荧光攻击的正向检测验证，并且可以基于实际需要进行荧光攻击的演示，通过多参数的系统分析，可以更加全面地反映待检测设备的安全性，有效提升了量子通信系统的实际安全性。

基于光源统计实时监测的抗攻击量子密钥分发方法及系统

Resumen de: CN122226269A

本发明公开了一种基于光源统计实时监测的抗攻击量子密钥分发方法及系统，属于量子通信领域。本发明利用亚泊松固态单光子源的二阶关联函数g(2)(0)作为“安全指纹”，通过实时监测其在通信过程中的统计偏移，实现对光子数分流（PNS）攻击的高灵敏度、毫秒级检测。在确认无攻击的安全状态下，系统启用增强模式，通过一个由监测结果动态确定的安全权重因子，在信息论安全的框架内合法地纳入双光子脉冲的密钥贡献，从而突破传统GLLP框架无条件剔除多光子脉冲的保守限制。本发明大幅降低了对单光子源纯度的硬件要求，使得中等纯度光源得以高效利用；同时，在高损耗场景下，密钥率较现有技术可提升三个数量级以上，显著延长了QKD的无中继安全传输距离。

一种基于微波光子技术的激光光源频率稳定性测量系统

Resumen de: CN122226163A

本发明公开了一种基于微波光子技术的激光光源频率稳定性测量系统，包括：光源、微波发生模块、电光调制模块、基于色散的相位调制模块、光电探测模块、相位检测模块、信号处理模块；其中，光源产生待测光信号，微波发生模块产生微波信号；电光调制模块对待测光信号和微波信号进行载波不抑制单边带调制，得到光载波信号；并将光载波信号拆分成第一、第二光载波信号；基于色散的相位调制模块对第一光载波信号引入相移，得到第三光载波信号，并将第三光载波信号转换为第一电信号，将第二光载波转换为第二电信号；相位检测模块输出与第一电信号和第二电信号之间的相对相位差相关的电压值；信号处理模块基于电压值，确定待测光信号的频率变化值。

调制器的设计方法、调制组件及量子密钥分发光源

Resumen de: CN122226161A

本发明提供了一种调制器的设计方法、调制组件及量子密钥分发光源，该设计方法包括：向多个调制器模型分别施加随时间变化的第一正向偏置电压，利用多个调制器模型分别对调制器进行瞬态仿真，得到多个第一映射关系；在每个第一映射关系下，利用与第一关系对应的调制器模型对调制器进行仿真，得到多个第二映射关系；在每个第二映射关系中确定有效折射率从峰值的A％下降至B％的时长；将多个调制器模型各自对应的时长、半波电压和相对损耗归一化后输入至目标函数，得到多个调制器模型各自对应的目标函数值；将目标函数值低于预设值的调制器模型确定为目标调制器模型，目标调制器模型的结构参数用于确定调制器的结构参数。

一种贝尔态测量装置及量子密钥分发系统

Resumen de: CN122226282A

本发明涉及光通信和量子密钥分发技术领域，公开了一种贝尔态测量装置及量子密钥分发系统，贝尔态测量装置包括两个消偏模块、不等臂偏振干涉仪以及两个单光子探测器，不等臂偏振干涉仪能够对经过偏振随机化的相位编码量子态进行偏振分束，对分束后的一路偏振分量进行延时，再对两个偏振分量分别进行45°偏振旋转，最后对旋转后的偏振分量进行二次偏振分束。与现有技术相比，本发明彻底消除偏振态波动、光纤双折射、偏振模色散等因素对贝尔态测量的影响，无需额外偏振跟踪、补偿模块，显著降低系统复杂度和成本，提升系统环境适应性；可以提高HOM干涉的准确性，降低量子密钥分发系统的误码率。

光子张量计算方法、光子张量核、计算机设备和存储介质

Resumen de: CN122226155A

本申请涉及一种光子张量计算方法、光子张量核、计算机设备和存储介质。所述方法包括：生成多波长光信号，并通过第一环回阵列波导光栅，对多波长光信号中各波长的光信号分别进行调制后，复用得到多路多波长的第一光信号；对每路第一光信号进行分束，得到多个第一光信号副本，并通过多个第二环回阵列波导光栅，分别对单个第一光信号副本中各波长的光信号分别进行调制，复用得到单路第二光信号；对各第二光信号进行光电转换，得到张量计算结果。采用本方法能够提高光子张量计算精度和可扩展性。

一种基于Bell态纠缠粒子的多用户量子公平交换方法及系统

Resumen de: CN122226246A

本发明提供一种基于Bell态纠缠粒子的多用户量子公平交换方法及系统。通过利用Bell态的量子纠缠特性和幺正矩阵超密编码技术，结合半可信第三方机制，实现了多方秘密信息的公平、安全交换，解决了传统协议中时间不公平、高第三方依赖及抗量子攻击能力弱的问题。

非局所的にランダム化された量子拡張セキュリティ

Resumen de: WO2024243546A2

The inventors have developed methods and systems to address the above challenges using entangled photons with multiple colors transmitted with a classical data stream as a technique to detect eavesdropping on the data stream and to prevent reverse engineering for demodulating the entangled bits from the data stream. In some embodiments, a time gate is used to interleave the quantum and classic signals to provide quantum encryption of fiber optic communication protocols.

一种低功耗并行光电通信系统

Nº publicación: CN122226162A 16/06/2026

Solicitante:

厦门大学

Resumen de: CN122226162A

本发明公开了一种低功耗并行光电通信系统，该系统包括发射子系统、接收子系统及多通道成像光纤链路；发射子系统包含蓝光Micro‑LED发射阵列芯片及其驱动芯片；接收子系统包含长波长Micro‑LED探测阵列芯片及其读出芯片；成像光纤链路在收发端间传输并行光信号。其中长波长Micro‑LED探测器采用铟组分可调的InGaN/GaN多量子阱有源区，使其带隙小于入射蓝光光子能量，从而实现蓝光的高效、强吸收；同时，通过深度耗尽效应将探测器结电容压缩至飞法级，并驱使光生载流子以饱和速度漂移。该系统结合“宽而慢”架构与高密度集成，实现了高带宽、高响应度与超低功耗。