Alerta

SYSTEMS AND METHODS FOR DISTRIBUTING ENTANGLEMENT

Resumen de: US20260342452A1

Quantum entanglement may be distributed at a high rate over an optical link by sequential emission of spin-entangled optical photon states from different matter based quantum systems into the optical link and execution of a heralded entanglement protocol using the emitted photon states. The quantum systems can be provided by luminescent centers such as T centres, for example. Quantum states of the quantum systems may be transferred to other quantum systems after emission of the photon states. Entanglement swapping may be performed to extend the entanglement to be between quantum systems. The technology has example application in cases where optical fibre links are shared between many nodes and/or where it is desired to extend entanglement to an orbiting satellite, and is particularly useful when optical links are not simultaneously available.

FAULT-TOLERANT ATOMIC QUANTUM COMPUTATION

Resumen de: AU2025373538A1

Provided herein are techniques for developing fault-tolerant quantum computation (FTQC) systems by leveraging quantum error correction (QEC) strategies in a neutral atom quantum information processing system. The techniques described herein reuse and replenish qubits in the quantum circuit during operation. To implement such mid-circuit qubit reuse, the quantum information processing system described herein uses a "spin-to-position" qubit conversion method for quantum state measurement. This spin-to-position qubit conversion allows non-destructive, loss-resolved qubit readout.

Methods and Procedures for a Quantum Communication Protocol for Multimodal Data Streaming and High Throughput Quantum Internet

Resumen de: US20260342554A1

A system and method are provided for providing secure communications using a quantum communications system. A clock (e.g., an atomic clock) at a transmitter is synchronized with a clock at a receiver to coordinate seeds from the clocks to respective pattern generators at the receiver and transmitter. The pattern generators determine quantum state bases for the modulation (transmitter) and demodulation (receiver) of information onto quantum states of a quantum beam that is sent from the transmitter to the receiver. Thus, the modulation bases are known to the transmitter and receiver, but not to an eavesdropper. After demodulating the quantum beam, the receiver detects the quantum states of the demodulated beam to retrieve the information. The information can be a cryptographic key sent securely from the transmitter to the receiver. The quantum states can be qumodes with the information encoded in their quadratures, which are detected using homodyne/heterodyne detection.

Distributed quantum computing

Resumen de: GB2705788A

Designing a quantum computing system by receiving parameters for an operation mode, identifying a suitable quantum error-correcting-code (QECC), deriving a topology for the QECC 1102, dividing the topology into tiles with connections to other tiles 1104, identifying properties of quantum processing units to implement tiles comprising a plurality of qubits 1106 and identifying required network pathways to implement connections between tiles by entanglement of signals generated by qubits of each tile 1108. QECC may be a low-density-parity-check, hyperbolic or semi-hyperbolic or Floquet code. May comprise distributed quantum system. Qubits may be trapped ion, cold atom, neutral atom, photon, spin or superconducting qubits. Signals may be photons generated by qubits. Signals may have wavelength in telecommunications range. Quantum processing units may comprise computational qubits and qubit-photon interfaces that may comprise an optical cavity. May comprise entanglement generators. Entanglement may be measured by a Bell state measurement. Network pathways may comprise switches to define a path between qubits and an entanglement generator. Tile may comprise nodes associated with qubits. Network pathways may be fixed or variable. Variable pathways may comprise intermediate layer of optical pathways coupled to outputs of processing units and switching layer coupled to optical pathways and entanglement generators. Figure 11

Ground-based quantum communication system using entangled particle arrays and precision timing

Resumen de: GB2705790A

This application relates to communicating data between two stations, each equipped with a particle array. The particle arrays are entangled. Data decoding involves performing measurements at predefined time intervals. Measurements at 1ns indicate a binary 0 value whilst measurements at 2ns indicate a binary 1 value. The measurements are performed on particles. The stations are synchronised with atomic clocks which must have a drift of less than or equal to 10 pico seconds. Also disclosed is quantum communication protocol which includes integrity checking via checksums derived from correlated measurements. The invention may be applied to long distance secure communications or fault detection on a power grid.

基于片上集成光频梳的并行量子密钥分发系统及方法

Resumen de: CN122993920A

本发明涉及量子密钥分发，具体涉及基于片上集成光频梳的并行量子密钥分发系统及方法，片上集成光频梳光源模块，利用单一泵浦光产生多个频率锁定的相干光载波；并行量子发射机模块，包含多个并行的发射单元，每个发射单元对一路相干光载波进行相位随机化、量子态编码和诱骗态调制；复用模块，对并行量子发射机模块输出的多路量子信号进行合路，并通过量子信道传输复用信号；解复用模块，接收来自量子信道的复用信号，并还原为多路独立的量子信号；并行量子接收机模块，包含多个并行的接收单元，每个接收单元对一路量子信号进行解调与单光子探测；本发明能够有效克服难以利用单一光源生成多个天生频率锁定、相位可控的相干光载波的缺陷。

光子时钟同步芯片及光子时钟同步方法

Resumen de: CN122993864A

本申请适用于时钟同步技术领域，提供了一种光子时钟同步芯片及光子时钟同步方法。芯片的发射端，用于生成光学频率梳光信号，并将部分光学频率梳光信号转换为光学频率梳电信号，并对光学频率梳电信号进行分频处理和第一锁相环处理，以将本地压控振荡器锁定至光学频率梳光信号的光频梳齿间距，得到第一时钟信号，并根据第一时钟信号，按照SEUL‑693循环序列向接收端输出同步信号；芯片的接收端用于接收同步信号，并根据同步信号，生成与光学频率梳光信号同源的第二时钟信号，且根据第二时钟信号，生成同步脉冲；同步脉冲用于确保接收端的时钟与发射端的时钟同步。本方案在不需要外部参考时钟的情况下实现了时钟同步，降低了时钟同步的成本。

一种高功率DFB阵列光源均衡方法

Resumen de: CN122993830A

本发明提供一种高功率DFB阵列光源均衡方法，涉及半导体激光器技术领域，生成分别对应多个目标光频率的相干参考光，并将各相干参考光分别注入对应的高功率DFB激光通道；采集各通道在数据调制器输入端的有效输出光功率和光场相位，根据光功率、目标光频率、通道传输效率及频率转换路径效率确定共同均衡功率和迁移光子通量；从功率过剩通道提取对应功率切片，将所述功率切片转换为功率不足通道的目标光频率，校正转换载波相位并将其相干合入功率不足通道主光路；根据均衡后的光功率、转换效率和相位误差修正提取比例、泵浦功率和相位校正量。

半导体器件及其操作方法

Resumen de: CN121356694A

An embodiment of the invention provides an optical integrated circuit device. An electronic and optical integrated circuit device for a convolutional neural network performs various aspects of analog-to-digital conversion (ADC) or digital-to-analog conversion (DAC) in an optical integrated circuit. The DAC may be performed using an optical modulator. Each light modulator receives a plurality of electrical input signals that collectively represent an input value or kernel weight. Electrical input signals are applied to different modulator segments. The modulator segments are combined to encode the digital data into corresponding analog optical signals. The ADC may include splitting the optical output signal and providing different degrees of attenuation for each signal shunt. Signals with different attenuation levels are converted into electrical output signals, which are compared to a reference voltage to determine a digital code. The attenuation level may be selected so that one reference voltage may be used for all comparisons. Embodiments of the invention also provide an electronic and photonic integrated circuit (EPIC) device and a method of operation thereof.

卫星间密钥协商方法、卫星及相关设备

Resumen de: CN122993929A

本公开提供了一种卫星间密钥协商方法、卫星及相关设备，涉及通信技术领域。方法包括：响应于进入第一卫星与第二卫星之间的可见性窗口，向第二卫星发送信标光信号，其中，可见性窗口为第一卫星和第二卫星之间具备建立光链路的视距条件的时间段；接收第二卫星反馈的确认光信号；从确认光信号中提取密钥密文；对密钥密文进行解封装，得到共享密钥，其中，共享密钥是后量子密码算法生成的。通过上述技术手段，解决相关技术中星间光链路中后量子密码算法密钥协商延迟高、可靠性差等问题。

一种基于层间同步约束的量子纠缠态传输保全方法及其系统

Resumen de: CN122993935A

本发明公开了一种基于层间同步约束的量子纠缠态传输保全方法及其系统。所述方法将纠缠态中的每个量子比特分配到等腰梯形地址阵列的一个独立层上，相位编码为各层地址对相对于中心位置的偏移量；施加层间同步约束，保证所有层偏移量一致；传输过程中并行监测各层偏移量，当一致性被破坏时执行层间重同步；接收端从各层偏移量重建纠缠态相位信息。本发明通过层间同步约束保证了纠缠态中所有量子比特的相位漂移同步进行，避免非同步漂移导致的纠缠破坏，适用于量子纠缠分发网络、量子中继器、分布式量子计算等场景。

一种基于激光器相对强度噪声指纹的动态认证方法

Resumen de: CN122994022A

本发明涉及光通信物理层安全技术领域，公开了一种基于激光器相对强度噪声指纹的动态认证方法，本发明充分挖掘激光器相对强度噪声全工作区的唯一性特征，基于真随机偏置电流挑战序列构建一次一密的动态认证体系，每次认证的挑战序列无重复和不可预测，可抵御重放攻击；采用时域自相关+频域功率谱+高阶统计量的多维度特征融合，在宽温、宽电压波动范围内仍保持高认证准确率；不依赖基于数学复杂度的传统数字加密体系，以半导体激光器光电转换过程中的相对强度噪声为熵源，构建物理层安全认证体系，无任何可被量子计算破解的数学环节，从物理底层实现抗量子攻击；可直接适配标准半导体激光器，无需对激光器进行任何结构改造，减少硬件额外成本。

自适应纠缠光子对的相位噪声去除系统

Resumen de: CN122962837A

本发明公开一种自适应纠缠光子对的相位噪声去除系统，该系统包括：脉冲泵浦光源（01），非线性晶体（1），带阻滤波器（2），第一、第二、第三光分束器（61、62、63），光耦合透镜（4）、第一、第二、第三单光子探测器（51、52、53），第一、第二可调光衰减器（11、12），第一、第二可调电控光相移器（21、22），光合束器（6），光隔离器（7），第一、第二光偏振控制器（81、82），2Í2光耦合器（9），数字信号处理模块（10），第一、第二数模转换器（101、102），第一、第二电放大器（201、202）。本发明采用自适应反馈结构与控制算法，实现纠缠光子对相位噪声的有效去除，以加强纠缠光子对的稳定性和抗干扰性，更好地满足量子通信系统的应用需求。

自旋-轨道微激光器、高维量子密钥分发系统和方法

Resumen de: CN122968784A

本发明公开了一种自旋‑轨道微激光器、高维量子密钥分发系统和方法，自旋‑轨道微激光器包括：半导体衬底；位于半导体衬底上的至少两个光学谐振腔；用于在光学谐振腔之间和/或之内引入可调非厄米耦合的耦合单元。本发明的自旋‑轨道微激光器，摒弃笨重的自由空间态制备组件和复杂的干涉仪网络，能够在芯片上直接产生N≥4维自旋‑轨道光子量子态，无需外部态调制器件，降低了系统复杂度；产生的所有量子态时空特性一致，降低了传输与探测误码率；通过可调非厄米耦合能实现量子态纳秒级快速切换，提升了密钥生成速率；将高维量子态发射机集成于微米级的芯片上，体积比自由空间系统缩小数个量级，为实现芯片化QKD终端和规模化生产奠定了基础。

一种双向环形量子信道多用户量子时间同步系统与方法

Resumen de: CN122969700A

本发明公开了一种双向环形量子信道多用户量子时间同步系统，包括基准站点、第一环形量子信道、第二环形量子信道和多个用户节点；本发明还公开了一种双向环形量子信道多用户量子时间同步方法，基于所述的一种双向环形量子信道多用户量子时间同步系统实现。本发明公开了一种双向环形量子信道多用户量子时间同步系统与方法，通过设置双环形量子信道进行时间同步，且各环形量子信道分别用于不同方向的信号传输，避免了两个方向的光信号对彼此的干扰，之后通过结合两个独立方向传输路径下的双时钟差实现更精准的同步修正，从而提高了时间同步的精度和稳定性，可应用于量子惯性导航与量子时间同步技术领域。

量子中继系统和量子网络

Resumen de: CN122969677A

本申请提供了一种量子中继系统和量子网络，可以应用于量子信息技术领域。该量子中继系统包括第一量子纠缠建立装置、第二量子纠缠建立装置和量子纠缠交换装置；基于概率性地在不同时刻产生的光子对、在第一量子纠缠建立装置中进行单光子干涉，配合以时间空间多模复用方式存储第一单光子干涉的成功预报对应的第二光子，在第一节点和第二节点之间建立时间态纠缠；基于概率性地在不同时刻产生的光子对、在第二量子纠缠建立装置中进行单光子干涉，配合以时间空间多模复用方式存储第二单光子干涉的成功预报对应的第二光子，在第三节点和第四节点之间建立时间态纠缠；基于偏振编码的纠缠交换，实现较远距离的第一节点和第四节点之间的纠缠。

Quantum Entanglement Communication Service

Resumen de: US20260332589A1

0000 A quantum entanglement communication service can be provided by detecting a request to access data stored at a first computer. In response to detecting the data access request, a request can be generated to request that a server computer generate an entangled particle pair. Measurement data can be received, the measurement data corresponding to a measurement observed after interacting a first bit of a token stored at a second computer with a first entangled particle from the entangled particle pair. An operation to perform on a second entangled particle of the entangled particle pair at the first computer can be determined and performed. A state of the second entangled particle can be measured to obtain a value, and a bit string can be generated, where the bit string can include a number that corresponds to the value.

SYSTEM AND METHOD FOR MULTIPLEXING QUANTUM SIGNALS IN A QUANTUM NETWORK NODE

Resumen de: WO2026220254A1

The present invention relates to a system for multiplexing quantum signals in a quantum network node, wherein the system comprises: - a central waveguide; - at least one coherent light source that is configured to emit light that is coupled to the central waveguide; - at least one modulator that is operatively coupled to the at least one laser and is configured to change the frequency and/or amplitude of optical signals from the light emitted by the coherent light source; - a plurality of add-drop filters that are coupled to the central waveguide, each of the add-drop filters being configured to in-couple and out-couple optical signals in a predetermined frequency band to and from the central waveguide respectively, wherein each predetermined frequency band of the add-drop filters differs from the predetermined frequency bands from the other add-drop filters; - a plurality of qubit systems, each qubit system being operatively coupled to a respective add-drop filter, wherein each qubit system comprises at least one optically interfaced networking qubit, OINQ, configured to emit quantum signals; and - a controller that is operatively coupled to the at least one modulator and is configured to sequentially change the frequency of the optical signals in the central waveguide to a frequency that falls within any of the predetermined frequency bands of the add-drop filters to sequentially address the plurality of qubits systems.

ENTANGLEMENT ASSISTED COMMUNICATION OVER TURBULENT FREE-SPACE OPTICAL LINKS USING ADAPTIVE OPTICS AND PHASE CONJUGATION ON IDLER PHOTONS

Resumen de: US20260332258A1

Disclosed are systems and techniques for entanglement-assisted communication using adaptive optics and phase conjugation of idler photons. A first periodically poled lithium niobate (PPLN) waveguide generates entangled signal-idler photon pairs using spontaneous parametric down-conversion of a first portion of an amplified beam. A demultiplexer separates signal and idler photons. The signal photons are modulated to generate modulated signal photons for transmission, and the idler photons are kept at the transmitter. A remaining pump power after the first PPLN waveguide is also transmitted and used by receiver adaptive optics to apply corrections to a received beam that includes the modulated signal photons. The remaining pump power is used as the reference signal for a homodyne receiver. The idler photons are phase-conjugated using a second PPLN waveguide, stored in an optical delay line, and

Communication Methods and Systems

Resumen de: US20260332254A1

0000 This invention relates to methods, a receiver arrangement, a transmitter arrangement, and system comprising both the receiver and transmitter arrangements for optical communication. The invention discloses the processing of a received beam of light carrying information by determining a degree of vectorness of the received beam of light, wherein the determined degree vectorness to determine the information carried by the received beam of light. In this regard, the invention disclosed the use of the vectorness of a beam of light as an encoding basis for optical communication.

METHOD FOR MODULATING THE POLARIZATION OF OPTICAL PULSES FOR GENERATING QUANTUM CRYPTOGRAPHIC KEYS, AND RELATED POLARIZATION MODULATOR

Resumen de: WO2026220321A1

A method for modulating the polarization of optical pulses, in particular for generating quantum cryptographic keys, guarantees an optimum stability of the output polarization states, and comprises the steps of : generating a plurality of optical pulses, routing them in a first fibre; separating the horizontal and vertical polarization modes and routing them in respective ends of a second polarization maintaining fibre, forming a ring, so that they travel such ring clockwise and counterclockwise, respectively; inserting a phase modulator inside such ring controlled by a pilot electrical pulse; recomposing the polarization modes in one single beam of optical pulses, and routing the resulting beam through said first polarization maintaining fibre, obtaining at the output a polarization state of the pulses which depends upon the shape of the pilot electrical pulse, wherein a co-propagating optical signal is exposed to a modulation only depending upon the superimposition to the pilot electrical pulse moving in its own direction, and wherein the counter-propagating optical signal is exposed to the whole pilot electrical pulse moving in opposite direction with an integration effect, so as to determine an asymmetry between the effect obtained on the co-propagating optical pulse with respect to the counter-propagating one to code different symbols, and so that said pilot electrical pulse determines different phase shifts to the two components which do not compensate each other.

量子网络组网方法和量子网络系统

Resumen de: CN122951933A

本发明公开了一种量子网络组网方法和量子网络系统，该方法包括：获取链路的最大纠缠生成容量，并根据实际运营成本因子，通过预设成本模型计算得到的单位纠缠成本；构建物理量子网络对应的无向图，并标注最大纠缠生成容量和单位纠缠成本；接收客户端对的纠缠资源需求；基于无向图，以最小化总成本为目标，以满足纠缠资源需求和为条件，构建最小成本流问题；调用优化算法，求解最小成本流问题，得到每条链路的纠缠生成量分配方案；根据分配方案，控制相应链路的量子设备执行纠缠生成与交换操作。本发明的方法通过引入成本模型，使最小成本优化从理论概念变为可计算、可执行的运营策略，能直接降低量子网络的实际运营开支。

基于量子随机数加密的对讲系统及加密方法

Resumen de: CN122951777A

本申请涉及一种基于量子随机数加密的对讲系统、加密方法计算机设备及存储介质。所述系统包括：量子安全处理模块，利用单光子雪崩二极管阵列在预设工作温度范围内通过量子隧穿效应产生暗计数，生成量子随机数比特流并作为加密密钥对语音数据执行按位异或运算；射频通信模块，用于加密语音数据的收发；量子密钥分发模块，用于将量子态的偏振或相位信息编码为射频信号的相位，实现密钥的无线安全分发；窃听检测模块，用于提取量子噪声指纹并与预置基线比对，同时计算量子误码率，在任一项超过阈值时生成告警。本申请利用量子隧穿效应实现物理真随机数生成，结合一次一密加密和双重窃听检测机制，有效提高了对讲系统的通信安全性。

一种针对微波光子折叠接收机的多信号频率测量方法

Resumen de: CN122951707A

本发明公开了一种针对微波光子折叠接收机的多信号频率测量方法，属于微波光子信号处理技术领域，包括：将模拟微波信号分别输入到光子折叠链路中，获得三通道中频信号，转换后得到数字离散信号，对数字离散信号经过希尔伯特变换、信号分离后得到三通道中每个信号的基带I/Q数据；对基带I/Q数据做FFT得到信号的前沿频率和后沿频率，计算三通道间的基带I/Q数据的频率差；测量信号的模糊数，结合模糊数和前沿频率、后沿频率对原始频率进行估计。本发明解决微波光子亚奈奎斯特折叠接收机面临的频率混叠问题，有效应对多信号时频混叠下频率模糊的问题，能够提升在复杂电磁环境中对于信号的实时捕捉、频谱监测能力。

一种可移动量子密钥充注方法及系统

Nº publicación: CN122951790A 20/10/2026

Solicitante:

济南量子技术研究院山东极量信息科技发展有限公司

Resumen de: CN122951790A

本发明公开了一种可移动量子密钥充注方法及系统，涉及量子通信技术领域。该方法将配对的两台可移动量子密钥分发设备分别移动至量子密钥分发位置，与作为中心节点的TF‑QKD探测端建立自由空间量子信道，经TF‑QKD生成两台设备之间的共享量子密钥并存储；当用户终端存在共享量子密钥通信需求时，两台可移动量子密钥分发设备分别移动至对应用户终端近端，通过近端安全链路将共享量子密钥充注至对应用户终端。本发明无需在用户之间铺设量子密钥分发光纤线路，以一个TF‑QKD探测端配合多台可移动量子密钥分发设备即可为任意两个用户直接生成并在线充注共享量子密钥，免除了密钥中继，降低了组网复杂度、光纤铺设成本及单点故障风险。