Alerta

METHOD AND DEVICE FOR CLOCK SYNCHRONIZATION IN QKD

Absstract of: US20260213854A1

0000 The present invention relates to a clock synchronization method comprising the steps of determining (S101) whether the emitter and the receiver are within acceptable frequency range difference, calculating (S102) a drift difference accumulated over a chosen time and obtaining a time compensation based on it, applying (S103) a compensation either to the clock phase shift or to the external frequency generator, and continuously (S104) tracking a frequency difference change between the emitter and the receiver by repeating the above steps.

METHOD FOR SYNCHRONIZING LIGHT BEAMS IN THE DETECTION OF VERY WEAK OPTICAL SIGNALS CARRYING CLASSICAL OR QUANTUM INFORMATION

Absstract of: US20260213914A1

0000 The subject of invention is a method for synchronizing optical beams in the detection of very weak optical signals carrying classical or quantum information, based on quantum pulse gating implemented using a nonlinear optical medium. It is characterized in that the lower frequency optical beam leaving the nonlinear medium is monitored by a photodetector connected to an electronic module, which controls the optical delay line placed in the optical path of the control beam or the signal beam in such a way that the value of the time-averaged optical signal measured by the photodetector is as small as possible, while the correction of the delay line based on the measured signal occurs continuously or periodically. The higher frequency optical beam leaving the nonlinear medium is measured using an optical signal receiver capable of detecting the optical signal modulated in the modulation format of the transmitter generating the signal beam pulses.

DUAL-LAYER QUANTUM COMMUNICATION AND INFORMATION PROCESSING USING TEMPORAL AND SPATIAL ENCODING

Absstract of: US20260213855A1

A method includes generating a photon and establishing a time-bin frame having a period T and multiple non-overlapping time bins of duration Δt. The method includes preparing a quantum state of the photon in a time-bin basis and in at least one additional quantum degree of freedom selected from polarization, OAM, and phase, thereby forming a composite quantum state. The method includes routing the photon to a selected emission point of a three-dimensional (3D) photonic structure having multiple emission points with respective spatial coordinates. The method includes synchronizing a sender and a receiver with a shared timing reference and time-gated detection windows aligned to the time bins, and emitting the photon from the selected emission point into a quantum channel. A combination of the time-bin state encoding quantum information and an emission-point coordinate associated with a spatial symbol and/or non-secret control metadata for protocol processing forms a composite codeword.

用于量子直接通信系统的量子信道建立方法和装置

Absstract of: CN122437614A

本申请提出一种用于量子直接通信系统的量子信道建立方法和装置，所述方法包括获取用于传输量子态信号的当前量子信道的量子信道参数；对所述量子信道参数进行全局扫描，以补偿由于工作环境变化产生的信道参数漂移；计算所述当前量子信道的误码率；当计算的误码率小于预设的阈值时，利用所述当前量子信道进行量子直接通信。根据本申请的示例实施例，通过对量子直接通信系统的量子信道参数进行全局扫描，解决了量子信道在初始化阶段存在的同步和量子态光脉冲信号相位精确控制制备问题。

一种基于多通道延迟反馈的窄线宽半导体激光器及其实现方法

Absstract of: CN122418426A

本发明涉及半导体激光器与光子集成电路领域，尤其涉及一种基于多通道延迟反馈的窄线宽半导体激光器及其实现方法。该激光器通过在主激光腔外引入多个具有不同往返时延的反馈光路，在时域上构造多周期延迟反馈网络，使外腔反馈在频域中形成等效的高阶滤波与相位整形效应，从而显著增强激光器频率对腔长扰动的抑制能力，实现激光线宽的有效压窄。该结构无需超长单一外腔，即可获得等效于长外腔或高Q值谐振器的线宽压缩效果，具有结构紧凑、稳定性高、易于集成等优点，适用于高相干光通信、相干探测、光学传感及激光雷达等应用场景。

基于量子熵源的抗篡改密码服务方法及系统

Absstract of: CN122416573A

本发明涉及安全随机数生成与抗篡改技术技术领域，具体为一种基于量子熵源的抗篡改密码服务方法及系统，应用于时间登记器、彩票开奖设备、电子投票设备或高精度核算装置中，所述方法包括以下步骤：通过部署在设备内部的多维传感器实时采集环境物理参数，所述环境物理参数至少包括温度、振动幅度、光照强度及电磁场强度。该基于量子熵源的抗篡改密码服务方法及系统，通过多维传感器实时采集温度、振动、光照及电磁场等环境参数，动态调整量子熵源的工作点，克服了环境漂移对随机数质量的影响，确保了在时间登记器、彩票机等设备长期运行中的输出稳定性，采用混合熵池动态加权机制，根据实时香农熵率和误码率自动平衡真随机数与伪随机数的比例。

密钥调度方法、装置、电子设备和可读存储介质

Absstract of: CN122419749A

本申请公开了一种密钥调度方法、装置、电子设备和可读存储介质，属于量子通信领域，包括：获取量子网络中各个节点的历史密钥消耗数据，以及，所述量子网络的网络信息；对各个历史密钥消耗数据进行处理，得到处理后的历史密钥消耗数据，并基于所述网络信息构建当前空间传导矩阵；将各个处理后的历史密钥消耗数据和所述当前空间传导矩阵输入当前预测模型，输出各个节点对应的预测结果；基于各个预测结果对各个节点进行密钥调度。本申请提高了预测精度，实现了密钥在节点间的高效流转，提升了量子网络的整体吞吐量。

一种LLO-CV-QKD盲相位补偿方法、装置、设备及介质

Absstract of: CN122419628A

本发明涉及量子保密通信技术领域，公开了一种LLO‑CV‑QKD盲相位补偿方法、装置、设备及介质。该方法对接收端量子信号正交分量进行采样，对接收复信号执行自然对数变换以分离幅值分量和相位分量，并结合对应 M 值的 M 次幂运算获得总相位噪声观测量。随后通过块平均、差分、局部平均滤波、累计恢复和卡尔曼滤波输出最优相位估计值并实施相位旋转补偿。该方案无需新增导频链路即可提高低信噪比条件下的盲相位估计精度、离散调制协议适配能力、传输稳定性和安全传输距离。

基于光子量子链路质量预测的密钥分发调度方法及系统

Absstract of: CN122419761A

本申请涉及基于光子量子链路质量预测的密钥分发调度方法及系统，涉及量子通信网络资源调度技术领域。该方法包括：获取光子量子链路的实时质量监测数据集与待调度密钥分发任务的属性信息集；根据实时质量监测数据进行脆弱期识别与时间窗口结构化划分，生成链路脆弱期结构化信息集；根据此，进行基于任务优先级的任务与可行时间窗口匹配计算，生成优先匹配任务‑窗口分配方案集；根据此，进行基于决策优先级的主动推迟开始或主动暂停等待决策，生成增强型调度决策集。本申请可以将任务精准嵌入预测的安全时间窗口，避免任务因链路质量恶化而中断，提高密钥生成效率与系统吞吐量。

一种可重构星地量子纠缠分发网络及量子密钥分发方法

Absstract of: CN122419748A

本发明涉及一种可重构星地量子纠缠分发网络及量子密钥分发方法，涉及量子通信技术领域。其通过锁模脉冲激光泵浦非线性晶体生成偏振纠缠光子对并完成时频编码模块与探测器模块的初始化配置；卫星过境时将网络切换为多点到点星地拓扑，对信号光进行时频编码后上行至卫星，闲频光经频分复用分配至地面节点进行符合探测，并基于死时间修正与二元熵函数推导星地安全密钥速率；卫星离场时触发光开关切换为点对点全连接地面拓扑，经光纤重路由与纯频分复用计算地面安全密钥速率；最终基于卫星轨道监测信号对多个量子城域网进行拓扑模式动态切换调度以实现全局最优密钥分发。本发明有效提升了星地量子通信网络的资源利用率与整体密钥吞吐量。

OPTICAL POWER LIMITER

Absstract of: US20260202693A1

An optical power limiter, a method of fabricating an optical power limiter, an optical device or system comprising an optical power limiter, and a method of limiting optical power using on optical power limiter. The optical power limiter comprises a first optical mode altering element configured to receive an input optical signal from a first waveguide; and an active medium coupled to the first optical mode altering element at a first end of the active medium such that a mode altered optical signal based on the input optical signal can enter the active medium, wherein a second end of the active medium is configured to couple the mode altered optical signal into a second waveguide as an optical output signal; wherein the active medium has a thermo-optic coefficient such that the mode altered optical signal entering the active medium experiences a refractive index gradient in the active medium as a result of absorption; and wherein the power of the optical output signal coupled into the second waveguide is limited to a maximum power value based on mode overlap of the mode altered optical signal and the second waveguide.

Verfahren und System zur Simulation von Quantenkommunikationsvorgängen

Absstract of: DE102025101067A1

Die vorliegende Offenbarung betrifft ein Verfahren und ein System zur Simulation eines Quantenkommunikationsvorgangs. Das Verfahren weist folgende Schritte auf: Bereitstellen, in einer Datenverarbeitungseinheit (10), von Quantenkommunikationsinformationen für mindestens einen zu simulierenden Quantenkommunikationsvorgang zwischen mindestens einer ersten Quantenkommunikationsvorrichtung (30), einer zweiten Quantenkommunikationsvorrichtung (31) und einer Abhörvorrichtung (33) über mindestens einen Quantenkanal (32); Bestimmen, in der Datenverarbeitungseinheit (10) und aus den Quantenkommunikationsinformationen, von Steuerungsdaten für einen Quantenprozessor (14), in dem Quantenoperationen auf Quantenteilchen angewendet werden, die Ionen oder neutrale Atome sind und die innerhalb mehrerer Operationsbereiche (21) räumlich kontrollierbar sind; und Simulieren des Quantenkommunikationsvorgangs in dem Quantenprozessor (14) mittels der Steuerungsdaten. Hierbei ist einem Quantenbit des Quantenkommunikationsvorgangs jeweils eines der Quantenteilchen zugeordnet. Kommunikationsoperationen des Quantenkommunikationsvorgangs entsprechen jeweils mindestens einer der Quantenoperationen, wobei die Quantenoperationen mindestens eine erste Quantenoperation für die erste Quantenkommunikationsvorrichtung (30), mindestens eine zweite Quantenoperation für die zweite Quantenkommunikationsvorrichtung (31) und mindestens eine dritte Quantenoperation für die Abhörvorrichtung (33) umfassen. Des W

QUANTUM PROCESSOR CHIP AND MULTI-LAYER PHOTONIC ROUTING NETWORK

Absstract of: WO2026152033A1

A quantum processor chip is disclosed including a multi-layer photonic routing network. In one example, quantum node cores are arranged in slanted columns, and the arrangement may be derived at least in part from projecting a three-dimensional dual helix arrangement into two dimensions. The multi-layer photonic routing network provides different node-to-node connections on each layer, thereby enhancing the overall number of node-to-node connections while minimizing waveguide crossings and reducing cross talk. Disclosed embodiments employ vertical optical couplers and programmable photonic routers to flexibly route photonic signals between nodes. In some embodiments, integrated entanglement and qudit hardware regions may be provided. The architecture supports dynamic fallback routing, scalable control, and is compatible with various quantum technologies, enabling robust, high-fidelity quantum information processing within a compact footprint.

QUANTUM KEY DISTRIBUTION SYSTEM AND METHOD

Absstract of: WO2026149671A1

A continuous-variable Quantum Key Distribution system is provided, comprising a transmitter and a receiver. The receiver comprises a detection part and a lossy optical element arranged between the transmitter and the detection part. The transmitter modulates a quantum signal and sends it to the receiver through a quantum channel. The lossy optical element is configured to: distribute N input modulated quantum signals into M output modulated quantum signals, with N, M ≥ 1, wherein one of the N input signals is associated to the transmitter and the other N-1 signals are vacuum signals; and provide to the detection part one of the M output modulated quantum signals. The receiver detects, with the detection part, one or more quadrature components of the one modulated quantum signal, and performs a post-processing procedure with the transmitter based on the detected quadrature component(s) and an amount of optical loss of the lossy optical element.

AUTHENTICATION METHOD USING PRE-SHARED SYMMETRIC KEY FOR LOCATION SELECTION OF AUTHENTICATION INFORMATION IN QUANTUM COMMUNICATION SYSTEM, AND APPARATUS THEREFOR

Absstract of: US20260205207A1

The present disclosure provides a method of performing user authentication in a quantum communication system. More specifically, the method includes transmitting an information sequence including at least one data block on the quantum channel, wherein based on a preshared key and at least one key generated based on the preshared key, a checking sequence for a quantum bit error rate (QBER) estimation is determined from each of the at least one data block, wherein the preshared key is used to select a location of a sequence included in the at least one data block; performing the user authentication based on a portion of the checking sequence; and performing a QBER estimation based on a result of the user authentication and a remaining checking sequence excluding the portion of the checking sequence. A user authentication error rate and a QBER estimation error rate are used for the QBER estimation.

QUANTUM DATA COMMUNICATION NETWORKS, HUBS AND CLIENT DEVICES

Absstract of: US20260203628A1

0000 Methods and apparatus for communicating information among client devices involve encoding information in photon states at client devices, sending the photon states to a hub device, loading the photon states into quantum systems of the hub device and comparing the loaded photon states, e.g. by a parity measurement. The hub may provide quantum entanglement that may be consumed in making parity measurements. Applications include quantum key distribution.

A system and a method for satellite relayed quantum communication

Absstract of: GB2645040A

A satellite relayed quantum communication system comprises a network of one or more chains of near-synchronously moving satellites, equipped with a telescope module that effectively creates a satellite lens. The lens, comprising multiple mirrors, focuses light to contain beam divergence and directs it to the next satellite or to a receiving station, transmitting quantum information across variable distances. A tracking module ensures accurate signal transmission although tracking needs would be minimal within a particular satellite chain due to near-synchronously moving satellites. The system optimizes the relationship between lens diameter, satellite separation, and wavelength of light to minimize diffraction loss. High reflectivity Bragg mirrors minimize reflection loss, and the lens can be constructed using various telescope configurations. Beacon lasers aid in tracking.The system can be adapted for deep space communication. Additional features include positioning quantum light sources and light collection units differently for different protocols for diverse protocols, quantum memories for enhanced efficiency and capabilities, and frequency multiplexing modules for increased quantum information transfer rates.

ENTANGLEMENT APPARATUS WITH REFLECTORS ON A QUANTUM DEVICE

Absstract of: WO2025230561A2

Example embodiments provide methods, systems, apparatuses, products and/or the like for reflecting, collecting, entangling, and/or detecting photons generated by quantum objects. In various embodiments a quantum entanglement apparatus is provided. The quantum entanglement apparatus comprising a first reflecting component on a first surface of a first quantum object confinement component, the first reflecting component configured to reflect a first emitted photon emitted by a first quantum object, a first photonic integrated circuit on a first side of the first quantum object confinement component, a first collection component optically coupled to the first photonic integrated circuit, wherein the first collection component is configured to collect the first emitted photon reflected by the first reflecting component, a first detector configured to detect photons traversing a first optical path of the first photonic integrated circuit, and a first filter along the first optical path.

ＢＢ８４プロトコル偏光状態をエンコードし補正するためのシステムおよび方法

Absstract of: WO2025012492A1

The invention relates to a system for encoding and correcting BB84 protocol polarisation states, which implements a method for measuring the polarisation error by carrying out said measurement before a step of transmitting the information and can be used in any system in which it is desired to implement quantum key distribution (QKD).

量子光的偏振态调整方法、装置及量子通信卫星

Absstract of: CN122394768A

本申请涉及量子通信技术领域，公开了一种量子光的偏振态调整方法、装置及量子通信卫星，量子通信卫星测量发射的量子光的偏振态，量子光由量子通信卫星中的光源产生并发射，确定量子光的偏振态相对于量子光的预设偏振状态的变化矢量，根据变化矢量，调整光源产生并发射的量子光的偏振态；量子通信卫星利用量子光作为偏振补偿的基矢光信号，光源在发射量子光时考虑了偏振态发生的改变，使发出的量子光的偏振态始终保持在预设偏振状态，实现量子光高偏振对比度、降低量子光的偏振误码率，不需额外硬件设备，节省硬件成本，通过量子通信卫星就可实现偏振态补偿，降低地面站工作人员的工作量，提高地面站工作人员的体验感。

一种公路交通流量监测方法及系统

Absstract of: CN122392305A

本发明公开了一种公路交通流量监测方法及系统，涉及智能交通监测技术领域。本发明通过部署量子纠缠态传感器网络，利用探测粒子穿越路网空间并与车辆运动激发的微弱电磁扰动耦合，计算贝尔参数序列并提取有效退相干事件，进而映射得到交通流量时间序列；通过延迟嵌入定理进行相空间重构，结合持久同调理论追踪单纯形复合体演化的拓扑特征，生成动态图网络结构；利用时空图卷积网络与量子启发式模拟退火算法越过局部能量壁垒，输出路网结构性突变的概率图数据；最终基于预测结果闭环调节传感器网络感知参数。本发明彻底突破了传统检测盲区，提前识别潜在涡流死锁，实现了全天候的交通前兆感知与动态自适应资源调度。

密钥接收端、量子密钥分发系统和量子密钥分发方法

Absstract of: CN122394772A

本申请提供了一种密钥接收端、量子密钥分发系统和量子密钥分发方法，该接收端包括调制泵浦源，用于生成双脉冲泵浦光序列；频率上转换源，用于基于双脉冲泵浦光序列对接收到的时间编码的量子态的量子光信号进行和频，以在前后两个时间窗口上产生偏振相互正交的量子态，从而得到两个时间窗口上的相对相位发生变化的和频光序列；测量模块，用于对和频光序列进行测量，得到测量结果，并根据测量结果生成量子密钥。

一种抗高功率拉曼噪声的自适应波分复用系统及方法

Absstract of: CN122394676A

本发明属于量子领域，公开了一种抗高功率拉曼噪声的自适应波分复用系统及方法，系统包括发送端和测量端；发送端生成量子信号脉冲，并与高功率经典数据信号合波后通过单模光纤传输，且响应于调节指令自适应调整诱骗态脉冲的发送概率与光子数分布比例；测量端用于：将经典信号与量子信号解复用分离；监测经典光激发的反向拉曼散射及瑞利散射背景，并动态计算单门背景噪声计数概率；对量子信号进行双光场单光子干涉探测，调整判决逻辑边界，提取单光子干涉事件与双光子符合事件，剔除受拉曼噪声污染的误码事件，并提取有效信号光强；对观测总增益和观测误码率进行置信区间估计，计算最终安全密钥率，并在安全密钥率下降时生成调节指令。

光电共封装光子收发器件、制备方法及光电共封装交换机

Absstract of: CN122386487A

本申请公开了一种光电共封装光子收发器件、制备方法及光电共封装交换机，器件包括：光电混合玻璃基板，集成有基板边缘波导、片上波导和光复用/解复用器，光复用/解复用器分别与片上波导和基板边缘波导连接；硅光 PIC 芯片，集成有芯片边缘波导、多个光调制器以及多个光探测器，芯片边缘波导分别与光调制器和光探测器连接，且芯片边缘波导与片上波导通过倏逝波耦合实现光路连接；光复用/解复用器用于将经单根光纤输入的多波长光源解复用为多路单波长光，传输至光调制器调制为高速光信号后，再合波输出；以及同时用于将输入的多波长光信号解复用为多路单波长光，传输至光探测器转换为电流信号。本申请能够提高光电共封装光子收发器件的带宽密度。

一种量子网络拥塞感知动态纠缠纯化提升吞吐量方法

Nº publicación: CN122372487A 10/07/2026

Applicant:

湖南科技大学

Absstract of: CN122372487A

本发明公开了一种量子网络拥塞感知动态纠缠纯化提升吞吐量方法，属于量子网络通信技术领域。本方法包括：构建包含节点数、链路数及节点交换成功率的量子网络模型，初始化网络全局变量与网络参数；生成不同节点对之间的通信请求并设置保真度阈值；基于加权优先级公式综合路径长度与纠缠交换成功率选择低成本纠缠路径；通过保真度逐跳退化特性确定纯化位置，利用概率纯化特性确定纯化次数，并引入链路拥塞因子动态调整纯化策略以缓解网络拥塞。本发明有效降低了建立不相邻节点间纠缠的时间与资源成本，显著提高了满足保真度要求的网络吞吐量，实现了纠缠资源的高效利用与多并发请求的良好支持。