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QUANTUM KEY DISTRIBUTION WITH SINGLE DETECTOR AND INTERFEROMETER BASED OPTICAL SWITCH

Resumen de: US20260222185A1

0000 A method and an apparatus for receiving quantum optical communication while reducing receiver, increasing maximum detection speed, or both. The disclosure comprises transforming the polarization encoded output of a QKD system to time-bin encoded output at the detector level. The disclosure also comprises a method and an apparatus using a quantum optical switch and several SPD units to increase communication speed.

STOCHASTIC TIME BASED PHOTON MULTIPLEXER

Resumen de: US20260222080A1

0000 Circuits and methods that implement multiplexing for photons propagating in waveguides are disclosed, in which an input photon received on a selected one of a set of input waveguides can be selectably routed to one of a set of output waveguides. The output waveguide can be selected on a rotating or cyclic basis, in a randomized or partially randomized order, or in a fixed order, and the input waveguides can be selected based at least in part on which of a set of input waveguides are currently propagating a photon.

METHOD AND APPARATUS FOR ENTANGLEMENT RESOURCE ALLOCATION

Resumen de: US20260223082A1

A method performed by a first node in a communication system includes receiving at least one synchronization signal from a second node, receiving system information from the second node, transmitting a random access preamble to the second node, receiving a random access response message from the second node, transmitting, to the second node, a quantum resource allocation request message including traffic characteristic information, receiving, from the second node, a quantum resource allocation response message including quantum resource allocation configuration information, receiving an allocation of a quantum resource from the second node based on a direct quantum channel, and transmitting data to a third node based on the quantum resource allocation response message and the quantum resource. The quantum resource allocation configuration information includes entanglement information or probability density coefficients of partially entangled quantum resources.

DISTRIBUTED QUANTUM COMMUNICATION NETWORK ARCHITECTURE BASED ON DOUBLE-HELIX STRUCTURE

Resumen de: US20260222081A1

A quantum communication system includes a photon source, a helical structure, a dynamic coupler, and a control module. The photon source configured to generate a photon. The helical structure includes a plurality of nodes configured to operate as emission points. The dynamic coupler is configured to transition the photon between the plurality of nodes of the helical structure. The control module is configured to identify a route within the helical structure for the photon based on a network condition, the route comprising a portion of the plurality of nodes, to control the dynamic coupler to create the route, to cause the photon to transition between corresponding nodes to traverse the route, and to control emission of the photon into a quantum channel by a corresponding node within the helical structure.

DEVICE AND METHOD FOR PERFORMING DISCONTINUOUS PATH SELECTION-BASED QUANTUM RESOURCE ALLOCATION IN QUANTUM COMMUNICATION SYSTEM

Resumen de: US20260222975A1

According to various embodiments of the present disclosure, there is provided a method of operating a third node in a communication system. The method includes transmitting one or more synchronization signals to multiple nodes, transmitting system information to the multiple nodes, receiving a random access preamble from the multiple nodes, transmitting a random access response to the multiple nodes, receiving network topology information from the multiple nodes, the network topology information including information on an entanglement distribution success rate of multiple links related to the multiple nodes, and information on a bell state measurement (BSM) success rate of the multiple nodes, receiving, from a first node among the multiple nodes, a quantum resource allocation (QRA) request message for a data transmission to a second node among the multiple nodes, acquiring information on multiple optimal paths between the first node and the second node, the multiple optimal paths being determined based on the network topology information, generating timing information related to the multiple optimal paths, and transmitting a QRA command message including the timing information.

Methods and Systems for Quantum Transducers

Resumen de: US20260222082A1

0000 Systems and methods for storing qubit signals are provided. An example method includes receiving a qubit signal in a microwave form; converting the qubit signal into a quantum acoustic signal by tuning the qubit signal into resonance with a phononic crystal oscillator; and storing the quantum acoustic signal in the phononic crystal oscillator for a predetermined period of time.

SYSTEM FOR PROVIDING AN EPR QUANTUM CHANNEL

Resumen de: WO2025061464A1

Disclosed is a system for providing an EPR quantum channel, comprising: • an emitter of entangled photons comprising a source configured to generate a pair of entangled photons, • a first receiver and a second receiver each comprising: - a unit for storing qubits, which is arranged to store the qubit carried by the received photon, - a photon switch arranged to send the received photon to the storing unit, - a detector of passage of photons, which is configured to control the photon switch and note the time of reception of the photon, • an information processor arranged to control the photon switch of the receiver, • a communication system linking the two receivers to each other, which is arranged to communicate the times of reception of the photons, in order to determine the pairs of entangled photons the two photons of which each reached the receiver to which they were sent.

OPTICAL COMMUNICATION ASSEMBLY FOR COMMUNICATING WITH MULTIPLE TERMINALS

Resumen de: WO2025238315A1

A free-field propagation optical communication assembly (1) is designed to communicate with multiple external terminals (100, 200, 300) each using a different optical channel. A given optical interface (10) is common to respective optical links established with the plurality of terminals. For this purpose, at least one beam splitter (22, 23) in the optical communication assembly is associated with a variable deflection system (32, 33) for modifying a line of sight (LV2, LV3) of the corresponding optical channel. A reduction in weight and overall size is thus achieved for the optical communication assembly, facilitating the use of this assembly on board a satellite (S). The optical communication assembly may be used in particular for the quantum transmission of encryption keys.

多元融合的量子时间同步钟差调控方法、系统、设备

Resumen de: CN122475801A

本申请实施例提供了一种多元融合的量子时间同步钟差调控方法、系统、设备，该方法包括：获取第一到达时间和第二到达时间；基于第一到达时间和第二到达时间确定第一时钟和第二时钟间的频率偏移量，并使用上述频率偏移量对第二端进行频率补偿；控制第二端进入锁定状态，基于上述频率偏移量的残余误差初始化比例‑积分‑微分(PID)控制器，并通过PID控制器输出相位调整指令，该相位调整指令用于修正第二端的底层硬件参数。上述方案，能够在不依赖外部频率分发的情况下，在硬件层面进行异地独立时钟的高精度同步。

基于B92偏振编码量子通信感知一体化系统及方法

Resumen de: CN122457251A

本发明涉及量子通信技术领域，公开了基于B92偏振编码量子通信感知一体化系统，包括：量子态制备与发送模块、量子通信/传感信道、量子态接收与测量模块以及时间同步与数据后处理模块。本发明在不引入额外的专用参考光信号且不损害量子通信安全性的前提下，实现了量子密钥分发与环境物理量感知功能的深度集成与同步执行。通过量子信道同时传输密钥信息和感知环境扰动，并利用光量子态对环境扰动的高度敏感性，结合通信误码率或单光子计数统计特性提取扰动信息。本发明采用自由空间量子通信与传感信道集成了相位传感功能，实现了信号载体、传输信道与处理设备的资源共享，显著节约了量子资源，提升了整体系统的资源利用效率。

一种基于ONT设备的量子融合密钥IPsec加密方法

Resumen de: CN122457327A

本发明涉及一种基于ONT设备的量子融合密钥IPsec加密方法，包括如下步骤：量子密钥生成：量子密码服务平台生成量子密钥；量子密钥获取：向量子密码服务平台申请并获取在线的量子密钥；IKE SA协商：生成IKESA会话密钥SKEYIDe；量子密钥融合：原始密钥与量子密钥进行融合；融合密钥下发：ONT上，融合密钥配置到内核层中；IPSec数据加密：调用所得会话密钥对报文进行封装加密，并发送至网络侧设备；量子密钥更新：周期性获取新的量子密钥并计算新的融合密钥。本发明通过量子密钥生成、获取、融合、加密、更新等步骤，解决传统IPSec加密在量子计算环境下的安全风险，具有提高通信安全性、抵御量子攻击的优点。

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

Resumen de: 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.

METHOD AND DEVICE FOR CLOCK SYNCHRONIZATION IN QKD

Resumen de: 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

Resumen de: 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.

用于量子直接通信系统的量子信道建立方法和装置

Resumen de: 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。

量子もつれ光子対配信器、量子もつれ光子対配信装置および量子もつれ光子対配信システム

Resumen de: JP2026120098A

0001 【課題】高品質な量子もつれ光子対を得る。 【解決手段】光子対配信システム１０００において、量子もつれ光子対配信器１００は、パルス状の第１量子もつれ光子対Ｅ１を含む複数の量子もつれ光子対が入力されて伝搬し、複数の量子もつれ光子対のそれぞれにおいて対である光子を分けて出力する光路を有する光路部２０と、光路部から出力された複数の光子を合波して出力する第１光合波器３１及び第２光合波器３２を含む光合波器群３０と、を備え、光路部は、第１量子もつれ光子対から分けられて第１光合波器から出力される一方の光子の出力時刻と第２光合波器から出力される他方の光子の出力時刻との差分である第１差分が、複数の量子もつれ光子対から分けられた他の光子のうち任意の２つの光子対の一方が、第１光合波器から出力される出力時刻と他方の光子が第２光合波器から出力される出力時刻との差分である第２差分とは異なるように光路の光路長を構成する。 【選択図】図１

密钥调度方法、装置、电子设备和可读存储介质

Resumen de: 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。

基于量子熵源的抗篡改密码服务方法及系统

Resumen de: 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。

一种LLO-CV-QKD盲相位补偿方法、装置、设备及介质

Resumen de: 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。

一种可重构星地量子纠缠分发网络及量子密钥分发方法

Resumen de: 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。

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

Resumen de: 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。

基于光子量子链路质量预测的密钥分发调度方法及系统

Resumen de: 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。

Verfahren und System zur Simulation von Quantenkommunikationsvorgängen

Resumen de: 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

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

Resumen de: 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

Nº publicación: US20260203628A1 16/07/2026

Solicitante:

PHOTONIC INC [CA]
PHOTONIC INC.

Resumen de: 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.