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SYSTEM UND VERFAHREN ZUM QUANTENSCHLÜSSELAUSTAUSCH (QKD)

Resumen de: DE102025103708A1

Vorgeschlagen wird System zum Quantenschlüsselaustausch (QKD) (1), umfassend eine verschränkte Photonenquelle (2) zur Erzeugung von polarisationsverschränkten Photonenpaaren, einen ersten Empfänger (3) und einen zweiten Empfänger (4), wobei jedes polarisationsverschränkte Photonenpaar aus einem Signal-Photon und einem Idler-Photon besteht, und wobei der erste Empfänger (3) über einen ersten Kommunikationskanal (7) mit der verschränkten Photonenquelle (2) zur Übertragung der Signal-Photonen oder der Idler-Photonen verbunden ist, wobei der erste Empfänger (3) eine erste Detektionseinheit (7) aufweist, und wobei der zweite Empfänger (4) über einen zweiten Kommunikationskanal (8) mit der verschränkten Photonenquelle (2) zur Übertragung der Idler-Photonen oder der Signal-Photonen verbunden ist, wobei der zweite Empfänger (4) einen Demultiplexer (11) und mindestens eine zweite Detektionseinheiten (10) aufweist, wobei der Demultiplexer (11) die Idler-Photonen oder die Signal-Photonen entsprechend ihrer Wellenlänge auf mindestens zwei Ausgänge des Demultiplexers (11) aufteilt, und wobei nach jedem Ausgang des Demultiplexers jeweils eine Polarisationsabgleicheinheit (12) angeordnet ist.

ENTANGLEMENT OF ATOMS AND PHOTONS AT A TELECOM WAVELENGTH FOR QUANTUM NETWORKING

Resumen de: US20260230190A1

0000 A method for generating a time-bin encoded telecom wavelength photon is disclosed herein. The method includes preparing a superposition state in an atom in a trap, exciting, at a first time, to an excited state, where the excited state decays along a path to a decay state of the atom and the telecom wavelength photon, transforming the decay state, and exciting, at a second time t<2>, to an excited state, where the excited state decays along a path to a decay state of the atom and the telecom wavelength photon.

MODULAR QUANTUM COMPUTING ARCHITECTURE WITH A CENTRAL COMMUNICATION MODULE

Resumen de: WO2026165415A1

Aspects of the present disclosure relate generally to systems and methods for use in the implementation and/or operation of quantum information processing (QIP) systems, and more particularly, a QIP system including a first computational module including a first plurality of computational ions and one or more first communication ions; a plurality of second computational module each including a second plurality of computational ions and one or more second communication ions; and a communication module including a plurality of third communication ions configured for forming entangled states with the one or more first communication ions and the one or more second communication ions. The communication module can facilitate communication between the one or more first communication ions and the one or more second communication ions of a particular second communication module via the plurality of third communication ions.

TWO-MODE INTENSITY SQUEEZED ENTANGLEMENT SOURCE

Resumen de: WO2026165084A1

Systems and methods for generating two squeezed optical signals using spontaneous four- wave mixing in an atomic vapor are presented herein. The techniques include providing an atomic vapor cell containing atoms of an atomic species exhibiting an atomic energy structure suitable for four-wave mixing. The techniques include generating first and second pump laser beams with wavelengths corresponding to first and second atomic transitions (e.g., associated with a two-photon excitation process) to cause four- wave mixing in the atomic vapor cell. The techniques also include generating a third probe laser beam with a wavelength corresponding to a third atomic transition (e.g., associated with a two-photon decay process) to cause two-mode squeezing of the two optical signals generated by the four-wave mixing process.

QUANTUM KEY DISTRIBUTION IN AN OPTICAL NETWORK AND QUANTUM-SECURED OPTICAL CHANNELS

Resumen de: US2025106012A1

Systems and methods for quantum key distribution in an optical network and quantum-secured optical channels. A node for operation in an optical network includes one or more degrees each connected to a corresponding optical span including one or more fibers; and one or more Quantum-Optical Service modules (QOSM) for each of the one or more degrees, each QOSM supporting Quantum Key Distribution (QKD) for establishing a quantum-secured channel and Optical Service Channel (OSC) functionality over the quantum-secured channel. A line amplifier system for operation in an optical network includes one or more optical amplifiers configured to amplify optical channels over an optical span in the optical network; and a trusted quantum repeater, connected to the optical span, and configured to support QKD for establishing a first quantum-secured channel and a second quantum-secured channel and OSC functionality over the first quantum-secured channel and the second quantum-secured channel.

FABRICATION METHOD, QUANTUM RANDOM NUMBER SECURITY CHIP, AND METHOD FOR GENERATING QUANTUM KEY

Resumen de: EP4787148A2

The present disclosure provides a fabrication method, a quantum random number security chip, and a method for generating a quantum key, which mainly relate to the field of quantum random number generation technology. The fabrication method includes: providing a quantum entropy source die and a security processing module on a first surface of a substrate and a second surface of the substrate respectively to form a three-dimensional stacked structure, where a plurality of copper pillars are disposed on the second surface of the substrate; performing a molding process on the first surface of the substrate and the second surface of the substrate to obtain an encapsulation structure encapsulating the substrate, where the plurality of copper pillars have bumps exposed outside the encapsulation structure; and rerouting a substrate pad disposed on the second surface of the substrate to a fan-out region of the substrate by using a wafer-level fan-out method, such that the bumps of the plurality of copper pillars exposed outside the encapsulation structure serve as external pins of the quantum random number security chip, thereby obtaining the quantum random number security chip.

MICROFABRICATED LIGHT DELIVERY SYSTEM FOR DISTRIBUTION OF COLLIMATED LASER BEAMS IN TRAPPED-ION DEVICES AND METHOD OF MANUFACTURING THE SAME USING MICROFABRICATION

Resumen de: EP4787083A1

0001 Provided is a microfabricated ion trap system with an integrated light delivery system for addressing confined ions with a light beam, and a microfabrication method for manufacturing a microfabricated ion trap system with an integrated light delivery system. The system comprises an optical refocusing element (e.g. a micro-fabricated lens system) to refocus or collimate the laser beam coupled out of a PIC chip waveguide and one or more optical redirecting elements (e.g. a microfabricated mirrors) to redirect the laser beam, such that the light propagates in or through a plane or a plurality of planes aligned with the ion trapping locations in the ion trap.

Distributed quantum computing

Resumen de: GB2703680A

Quantum error correction is implemented in a quantum computing system 100, e.g. a quantum memory, comprising physically distinct quantum processing units 102 by: selecting an error correcting code having a defined topology; dividing the topology into a plurality of tiles, each having connections with other tiles, wherein dividing the topology is designed to minimise connections with other tiles; associating each tile with the quantum processing units; implementing the connections between the tiles by entangling the quantum states of qubits in each quantum processing unit or in different units; and applying the quantum error correcting code during a quantum operation. Entangling comprises controlling switches to define communications paths through an optical coupling region 110 between a pair of selected qubits 102 and an entanglement generator 106, e.g. performing Bell state measurements. The error-correcting code may be: low-density parity-check, qLDPC; hyperbolic or semi-hyperbolic; Floquet. The switches may be optical switches, e.g. one-to-many switches to selectively route photons to a selected quantum entanglement generator implemented as photonic integrated chip to couple each qubit to a fixed number of outputs. figure 1

一种用于量子网络中图态高效分发的启发式路径搜索方法

Resumen de: CN122513090A

本发明提出一种用于量子网络中图态高效分发的启发式路径搜索方法。所述方法包括：定义量子网络中图态的经典存储方法，并将量子网络中的图态用经典方法存储；定义量子网络中图态变换的经典操作集合；计算量子图态操作上界以及在搜索过程中剪枝超过操作上界的集合；设计启发式搜索函数，使得在搜索过程中可以稳定地朝着目标图态进行搜索；执行搜索算法以找到从初始图态变换到目标图态的操作序列。本发明通过引入经典启发式搜索算法，对图态分发的操作序列进行智能的优化，减少图态分发过程中不必要的纠缠产生与消耗，从而提高资源的利用效率。

一种面向量子功率域非正交多址接入的迭代检测方法

Resumen de: CN122513005A

本发明属于无线通信与量子通信融合技术领域，具体为一种面向量子功率域非正交多址接入系统的迭代检测方法。本发明包括构建量子功率域非正交多址接入系统，包括发送端、自由空间信道及接收端，发送端依次完成信道编码、随机交织和量子相干态调制，接收端包括Bondurant量子接收机和基于Turbo原理的多用户迭代检测器。本发明特别在接收端建立考虑死区时间效应的光子统计模型，将探测器非理想特性纳入多用户检测过程，并结合串行干扰消除与检测器、译码器之间的软信息交互，实现对多用户叠加信号的迭代检测与译码；本发明方法能够提高量子功率域非正交多址接入系统中多用户信号的分离能力、检测准确性和译码可靠性。

一种基于纠缠态与稳定子码的高效量子密钥生成方法

Resumen de: CN122513093A

本申请是关于一种基于纠缠态与稳定子码的高效量子密钥生成方法，包括：构建多组原始GHZ纠缠态，将第一粒子序列和第二粒子序列分发给发送方，将第三粒子序列分发给接收方；对第一粒子序列与第二粒子序列中的每个粒子分别施加第一酉操作与第二酉操作，并与第三粒子序列组成可区分GHZ纠缠态；制备多个校验粒子，得到校验序列与对应的制备基，并进行配对，形成多个复合粒子组；通过量子纠错码对每个复合粒子组进行编码，得到复合量子系统；通过量子纠错码对复合量子系统进行解码，保留有效粒子组进行GHZ基测量，生成最终密钥。本申请能够提升密钥生成效率，并且具备单比特纠错能力，抗噪声强，同时窃听检测简捷高效。

一种基于集成光量子芯片的纠缠-干涉互补性验证装置及方法

Resumen de: CN122513022A

本发明提供一种基于集成光量子芯片的纠缠‑干涉互补性验证装置及方法，装置包括：片上量子比特干涉单元、路径探测器单元和测量单元；片上量子比特干涉单元包括依次分布在目标量子比特的光子传播路径上的第一分束器、相位调制器和第二分束器；路径探测器单元包括依次分布在路径探测器的光子传播路径上的第三分束器和可调耦合器；测量单元包括相互连接的单光子探测器阵列和数据采集与处理模块；其中，片上量子比特干涉单元的输出端和路径探测器单元的输出端分别连接至测量单元的输入端。本发明在集成光量子芯片上验证纠缠与干涉的互补关系，为片上量子计量和信息处理提供了核心器件。

一种移动平台间的符合计数测量方法及系统

Resumen de: CN122486802A

本发明公开了一种移动平台间的符合计数测量方法及系统，所述方法包括将纠缠源输出的信号光直接接入本地单光子探测器，生成本地触发信号；根据输入触发信号的时序，实时生成与触发信号时序严格同步的光脉冲，通过波分复用器将该光脉冲与纠缠源生成的闲频光进行合束处理；远端移动节点接收合束光信号后，通过解波分复用器将闲频光与脉冲光精准分离，并通过高速时间符合测量装置记录符合计数（C.C.,Coincidence count）；所述系统包括纠缠源节点以及远端移动节点。本发明无需额外时间同步步骤，可完全规避平台移动带来的时延变化影响，兼容不同数量移动平台的组网需求，实现高精度实时符合计数测量。

집적 양자 키 분배 송신기

Resumen de: EP4572187A1

0001 The present invention relates to a transmitter (1000) for a BB84 protocol, comprising a laser (1100) configured to generate a first light pulse (P<1>) having a first duration (T), a modulator (1200) configured to modulate an intensity of the first light pulse (P<1>) so as to obtain a second light pulse (P<2>) having a second duration (T) smaller than the first duration (T) and/or a third light pulse (P<3>) having a third duration (T) smaller than the first duration (T). Further embodiments relate to methods for operating the transmitter (1000).

对基纠错方法、量子密钥分发系统及存储介质

Resumen de: CN122496204A

一种对基纠错方法、量子密钥分发系统及存储介质，涉及量子密钥分发技术领域。对基纠错方法包括：发送端制备携带第一密钥信息和第一发送端基信息的量子光信号；接收端解码量子光信号，以得到携带第二密钥信息的第一探测结果和第二探测结果；接收端对第一探测结果和第二探测结果进行对基，以得到第一对基结果；发送端对第一对基结果中的接收端测量基和第一发送端基信息进行对基，以得到第二对基结果；接收端对第二对基结果和第一对基结果进行对基；发送端根据第三密钥信息得到校验子，接收端根据校验子对第二密钥信息进行纠错，以得到纠错后的第四密钥信息。该对基纠错方法提高对基纠错的速率。

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.

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.

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.

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.

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.

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.

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.

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.

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。

経路選択装置、光無線通信システム、経路選択方法、光無線通信方法、及び、プログラム

Nº publicación: JP2026121644A 27/07/2026

Solicitante:

日本電気株式会社

Resumen de: JP2026121644A

【課題】 光無線通信における環境空間に基づいて、光無線通信の通信性能を向上させる。【解決手段】 本発明にかかる経路選択装置は、第１光無線通信装置、第２光無線通信装置、及び、第１光無線通信装置から第２光無線通信装置までの光無線通信の経路の一部を構成する１台以上の中継装置それぞれにおける光無線通信に用いられる環境空間に関する情報を取得する環境空間情報取得手段と、環境空間に関する情報に基づいて、暗号鍵を配送する鍵配送経路を選択する経路選択手段と、選択された鍵配送経路を第１光無線通信装置、第２光無線通信装置、及び、中継装置に通知する経路通知手段と、を備える。【選択図】 図１