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METHOD AND SYSTEM FOR QUANTUM KEY DISTRIBUTION

Resumen de: EP4838833A1

A method for quantum key distribution is provided in a system which comprises a first data processing device (10a) and a second data processing device (10b). the method comprises: transmitting a first optical pulse (12) via an optical quantum channel (11) from the first data processing device (10a) to the second data processing device (10b); transmitting second optical pulses (14) from the first data processing device (10a) to the second data processing device (1ob) via the optical quantum channel (11) and subsequent to transmitting the first optical pulse (12), wherein the second optical pulses (14) comprise information for quantum key distribution and wherein an intensity of the first optical pulse (12) is greater than intensities of the second optical pulses (14); and receiving backscattered radiation (15) which is backscattered from the first optical pulse (12) during propagation of the first optical pulse (12) through the optical quantum channel (11). The optical quantum channel (11) further comprises a restricted access section (31) adjacent to the second data processing device (10b), the restricted access section (31) having a path length being at least half of a path distance between the first optical pulse (12) and a last of the second optical pulses (14).

SYSTEM AND METHOD FOR QUANTUM-SECURE MICROGRIDS

Resumen de: US20260352450A1

A quantum-key distributed (QKD)-enabled communication architecture it devises for networked microgrids (NMGs). A real-time QKD-enabled NMGs testbed built in an RTDS environment, and a novel two-level key pool sharing (TLKPS) strategy it designs to improve the system resilience against cyberattacks. In the QKD-based microgrid testbed design there is used a real-time power system simulator, i.e., RTDS, including the QKD modeling, hardware connection, communication network design, and QKD integration. By integrating QKD features into a real-time microgrid simulator, this testbed offers a flexible and programmable testing environment for evaluating the performance of QKD-enabled microgrids under a variety of scenarios.

System and Method For Controlling Time Dilation In Time-Sensitive Networks

Resumen de: US20260352366A1

A system and method determine a clock drift and a clock variance of each node in plural nodes of a time-sensitive Ethernet network. An accumulated clock offset along a time-sensitive network path in the time-sensitive network is determined based on the clock drifts and the clock variances. A guard band having a dynamic size is determined based on the accumulated clock offset. The times at which Ethernet frames are communicated through the nodes are restricted by communicating the guard band with the dynamic size to one or more of the nodes.

METHOD AND SYSTEM FOR ONGOING POLARIZATION FEEDBACK AND CONTROL DURING QUANTUM KEY DISTRIBUTION USING DATA ANALYSIS

Resumen de: US20260352449A1

A quantum communication system and associated methods are described for securely establishing a cryptographic key between multiple transmitters and a receiver. Each transmitter emits qubit signals from a light source within defined time windows, characterized by specific bases and modes controlled by a transmitter controller. The receiver utilizes an interference device with multiple inputs to receive qubit signals and outputs to generate an interference signal, which is detected by multiple detectors. A receiver controller sends information on detected outputs to transmitters and provides feedback based on polarization characteristics. Simultaneously, the system adjusts subsequent qubit signal characteristics based on this polarization feedback, enabling the establishment of a cryptographic key between transmitters using the detected signals. This adjustment optimizes the cryptographic key rate, enhancing security and efficiency in quantum communication protocols.

METHOD FOR ENHANCING THE PRIVACY OF DELEGATED QUANTUM COMPUTATIONS, AND SYSTEM FOR IMPLEMENTING SUCH METHOD

Resumen de: US20260350212A1

The invention concerns a method for enhancing the privacy of delegated quantum computations, involving: a client (A) whose aim is to solve a computational problem based on sensitive data and/or using a sensitive algorithm, and a cloud computing service provider (B) who has quantum computing capacities superior to the client (A) and is therefore capable of solving the problem and/or running the client's desired algorithm; wherein the method comprises a sequence including the following steps: a) a light emitter (10) controlled by the client (A) emits at least one pulse (11) having a specific quantum state (S1), b) a quantum emitter (20) controlled by the provider (B) receives the pulse (11), c) the quantum emitter (20) emits a single photon (21) supporting a photonic qubit (Q2), with a relationship being defined between the quantum state (S1) of the pulse (11) and the photonic qubit (Q2). The invention also concerns a system for implementing this method.

Shared Key Generation in Continuous-Variable Quantum Key Distribution System

Resumen de: US20260352452A1

A shared key generation technique that can improve error correction performance and key generation rate in CV-QKD is provided. A receiver is configured to: a) set reference bit positions for basis reconciliation with a transmitter, wherein the basis reconciliation generates sifted key quantization data from the received quantization data according to the reference bit positions; b) perform hard decision on the sifted key quantization data to generate a corrected key; c) perform soft-decision error correction processing on the sifted key quantization data to generate error correction information to transmit the error correction information to the transmitter; and d) decide whether synchronization is established or not, based on an error rate between the corrected key and another corrected key generated based on the error correction information at the transmitter.

Simulated Quantum Entropy Fusion for Cryptographic Key Generation Without Quantum Hardware

Resumen de: US20260352456A1

A method and system for generating high-entropy cryptographic keys by fusing heterogeneous entropy sources without requiring dedicated quantum hardware. The system, referred to as Simulated Quantum Entropy Fusion (SQEF), combines biometric inputs, environmental randomness, and device signals through a multi-stage process of entropy normalization, cryptographic hashing, and symbolic encoding. The resulting keys achieve entropy levels exceeding 7.95 bits per byte, suitable for post-quantum cryptographic applications while using only conventional computing resources. The system enables advanced security for zero-trust environments, digital identity verification, and next-generation encryption protocols. Implementation variants provide optimized performance across desktop, mobile, and server environments while maintaining minimal resource consumption. The system's multi-source approach provides resilience against targeted attacks and entropy source compromise while maintaining compatibility with existing security infrastructures.

PORTABLE OFFLINE ARTIFICIAL INTELLIGENCE VOICE ASSISTANT DEVICE WITH MODULAR DOMAIN KNOWLEDGE PACKS

Resumen de: US20260349704A1

A portable voice-assistant device includes a rugged enclosure housing an AI processor that executes speech-to-text, language-model inference, and text-to-speech synthesis entirely on-device without external network connectivity. The device features a removable storage interface for mounting Domain Pack archives at run-time to augment AI responses with domain-specific knowledge, including optional adapter weights for language-model specialization. Hot-swappable battery packs with super-capacitor hold-up power and an MPPT solar charge controller enable sustained field operation. A security microcontroller validates Domain Packs using post-quantum digital signatures and triggers cryptographic key zeroization upon tamper detection. The firmware provides mutually-exclusive Open and Secure configuration modes. An optional multimodal sensor pod enables on-device vision processing with embedding fusion. A method of offline voice-query processing using retrieval-augmented generation from Domain Packs is also disclosed.

METHODS AND SYSTEMS FOR IMPROVING AUTONOMOUS TELLER MACHINES ("ATMs")

Resumen de: US20260349868A1

0000 A method for correcting an error located within an autonomous teller machine (“ATM”) includes experiencing a difficulty at the ATM and instantiating satellites in place of a primary connection which is experiencing the difficulty, generating an error log at the ATM, transmitting the error log to a server, encrypting the error log at a decentralized end node, receiving the encrypted error log at the server, authenticating, via decrypting, the error log, executing a forward and backward propagation at a quantum generative adversarial network (“QGAN”) to generate a predictive solution, transmitting the predictive solution to a technical agent to approve, analyzing and approving the predictive solution at the technical agent, transmitting the predictive solution to the ATM upon approval, and installing the predictive solution at the ATM.

QUANTUM-RESISTANT ATTESTED KEY AND MODEL LIFECYCLE MANAGEMENT SYSTEM

Resumen de: US20260352451A1

0000 A quantum-resistant system manages the key and model lifecycle of an artificial intelligence model within a trusted execution environment (TEE). A key management engine generates, seals, rotates, and revokes post-quantum keys bound to a hardware-rooted measurement. A secure model update module applies attested changes linking a prior state to a new state. A verifiable fine-tuning module binds, as a single signed unit, digests of training data, gradients, and resulting weights to the measurement. A tamper-evident provenance ledger records the operations and may anchor digests to a public blockchain. The system may mint a self-sovereign agent identity for consumption by a separate orchestration subsystem. Keys, updates, and evidence exist unencrypted only within the TEE and are tamper-evidently bound to the measurement, so an operator cannot alter or suppress them without invalidating the attestation.

SYSTEMS AND METHODS FOR QUANTUM KEY DISTRIBUTION USING SEMI TRUSTED NODE QUANTUM NETWORKS

Resumen de: US20260352454A1

Systems and methods for quantum key distribution (QKD) using semi trusted node quantum networks are disclosed. Each intermediate link in the system only performs the quantum communication, basis announcement, and parameter estimation of the QKD protocol. If parameter estimation passes for all links, the end-users may use an encrypted classical channel to create their respective raw keys. The intermediate nodes may then compute the parity of their raw keys, and the end-users may correlate their raw keys. The end-users may agree on a random substring of their raw key, whose length is half of the original raw key, on which they will perform the classical post-processing (error correction and privacy amplification). If the parameter estimation passes for all links, this means that the intermediate keys share very little correlation with the end-users' keys, and that an external adversary has very little knowledge of all of the intermediate keys.

System and Method for Quantum-Safe Transaction Security Using Entangled Photons

Resumen de: US20260352453A1

0000 A quantum-safe transaction security system and method using entangled photons for authentication in finance, voting, and IoT. Entangled photon pairs are generated and distributed via a scalable fiber and satellite network with quantum repeaters. Entanglement verification, AI-driven anomaly detection, AES-256 redundant verification, and tamper-proof detectors ensure transaction integrity with 95% fidelity over 50 km.

Authentication method and system, a quantum communication network, and a node for quantum communication

Resumen de: GB2705819A

Authentication for quantum communication between first and second nodes involves exchanging information encoded on weak light pulses between the nodes via a quantum communication channel and receiving by the second node a message authentication code (MAC) and a message from the first node. A first copy of the message is provided to a quantum key distribution (QKD) system, and a second copy and the received MAC is provided to an authentication engine. The QKD system, while the authentication of the message is performed by the authentication engine, processes the message as it arrives and the exchanged information to generate a QKD key, labels the QKD key as unauthenticated until the message is authenticated. To authenticate the message, a polynomial evaluation hash function is applied to the second copy of the message to obtain a hash code, a one-time pad (OTP) cipher is applied to the hash code to obtain a further MAC, and the received MAC and the further MAC are compared. A subsequent authentication frame, interleaved with a subsequent data frame comprising a message, may comprise a subsequent MAC, wherein the subsequent MAC is used to authenticate the subsequent data frame and an earlier authentication frame. Fig. 6

用于实现格基抗量子密码算法的协处理器、芯片、电子设备和密钥生成方法

Resumen de: CN122348818A

A coprocessor, a chip, an electronic device and a key generation method for implementing a lattice-based anti-quantum cryptographic algorithm, the coprocessor comprising: a processor core comprising at least two operation cores capable of implementing all operations of the lattice-based anti-quantum cryptographic algorithm; the register is used for storing configuration information required for calling functions in the operation core; and the memory controller is used for calling data in the memory according to the configuration information under the control of the at least two operation cores so as to realize parallel operation between the at least two operation cores. According to the coprocessor, full-hardware design of operation functions in the lattice-based anti-quantum cryptographic algorithm is achieved, the operation speed of the overall process of the algorithm can be greatly increased, in addition, part of cryptographic functions can be processed in parallel, the utilization rate of system and hardware resources is greatly increased while the operation performance is further improved, and the cost is reduced. And the method can be applied to middle and high-end products with higher algorithm operation performance.

SYSTEM AND METHOD FOR QUANTUM-RESISTANT CRYPTOGRAPHIC REFLECTION ARCHITECTURE FOR DISTRIBUTED-LEDGER TRANSACTION DATA

Resumen de: US20260342601A1

A computer-implemented system for quantum-resistant cryptographic protection of distributed-ledger transaction data. Upon close of a transaction block, a reflection generation engine generates N cryptographic reflections, each comprising a multi-component commitment including content, state, temporal, chain anchor, sibling reflection, and algorithm fingerprint components. Reflections are constructed using a heterogeneous set of cryptographic primitives such that no two reflections share identical primitives, and reflections do not contain recoverable transaction data. Each reflection is distributed to a corresponding vault implemented as a cloud storage service, a custodial storage arrangement, a sovereign data facility, or a smart contract repository, each vault operating under a distinct custody and jurisdictional regime. An anomaly-aware multi-factor authentication gate validates retrieval requests. A three-tier verification module supports existence proof, integrity attestation, and forensic recovery modes.

A PILOT-FREE SCHEME FOR QUANTUM KEY DISTRIBUTION

Resumen de: WO2026224371A1

The disclosure regards a system for a quantum key distribution (QKD) protocol, the system comprising an optical transmitter comprising an optical source configured to generate a primary optical signal, and a modulator configured to modulate the amplitude and/or the phase of the primary optical signal. The system further comprises an optical receiver comprising a local oscillator configured to generate a secondary optical signal, a state detection unit configured to detect one or more quadrature components of the primary optical signal, and a digital signal processing (DSP) module configured to process the one or more quadrature components, wherein the optical receiver is configured to enable interference between the primary and secondary optical signals, through the mixing conducted by the photodetector thereby generating a beat signal, and wherein the DSP module is configured to estimate impairments of the system, such as phase noise, by utilizing the beat signal. The disclosure further relates to a method for estimating impairments of the system.

METHOD AND SYSTEM FOR KEY DISTRIBUTION TO A PLURALITY OF DESTINATION NODES IN A COMMUNICATION SYSTEM

Resumen de: WO2026223888A1

Provided is a method for distributing a key from a source node to N destination nodes in a communication system, N being an integer greater than 2. Each of the N destination nodes has a respective first mask, hereinafter referred to as "neighbor mask", and a respective local key. The method comprises generating, by the source node, a key mask by combining a local key of the source node and a second mask, hereinafter referred to as "community mask", the local key of the source node being the key to be distributed. Furthermore, the method comprises transmitting, by the source node, the key mask to a destination node of the N destination nodes. The destination node obtains the local key of the source node by combining the received key mask, the respective neighbor mask of the destination node, and the respective local key of the destination node.

COMMUNICATION SYSTEM, CONTROL APPARATUS, COMMUNICATION METHOD, CONTROL METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM

Resumen de: US20260342553A1

A network system (1) includes a node (10a), a node (10b), a node (10c), and an optical network controller (20). The node (10a) encrypts, by using a key (K1), data to be transmitted to the node (10b). The node (10b) decrypts, by using the key (K1), data received from the node (10a), and encrypts, by using a key (K2), data to be transmitted to the node (10c). The node (10c) decrypts, by using the key (K2), data received from the node (10b). The optical network controller (20) couples an encrypted link (L1) between the node (10a) and the node (10b) to an encrypted link (L2) between the node (10b) and the node (10c) and sets an encrypted communication path from the node (10a) to the node (10c).

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.

ENTANGLEMENT SCHEDULING AND ENTANGLEMENT GENERATION METHODS AND APPARATUSES

Resumen de: WO2026224573A1

Methods for scheduling attempts to entangle quantum systems assign entanglement attempts for pairs of the quantum systems to corresponding time slots of a frame of a series of frames. Each frame includes plural time slots each long enough to execute an entanglement protocol on a pair of the quantum systems. The methods yield data indicating the assignments of pairs of the quantum systems to corresponding time slots. A frame duration is long enough that a period between the end of a time slot in one frame and the beginning of the same time slot in the next frame is sufficient to determine that an entanglement attempt for a pair of the quantum systems in the time slot and to disengage the successfully-entangled pair of quantum systems from further entanglement attempts. Control systems and apparatus for entangling quantum systems are also described.

SEED CACHING TO OVERCOME PQC STORAGE BOTTLENECKS

Resumen de: US20260342559A1

Devices, systems, and methods for memory-efficient post-quantum (PQ) cryptography are provided. A method includes generating, by a hardware security module (HSM), a cryptographic seed, storing, by the HSM, the cryptographic seed, receiving, by the HSM and from a cryptographic processor, a request for the cryptographic seed, and responsive to the request, providing, by the HSM and to the cryptographic processor, the cryptographic seed.

METHOD AND APPARATUS FOR POST-QUANTUM CRYPTOGRAPHY COMMUNICATION

Resumen de: US20260342591A1

In the present disclosure, a method and an apparatus for post-quantum cryptography communication are presented. The method includes generating a first message, where the first message includes credential identification information that identifies credential information; and sending the first message. In the present application, credential identification information which is used to identify credential information (e.g. certificates or public keys) is transmitted in place of the entire certificate and public key, hence which reduces the size of the message transmitted and also ensures security.

SYSTEM AND METHOD FOR USAGE-BASED SEEDING OF PRE-STORED HIDDEN AUTHORIZATION CODES FOR HIGH EXPOSURE COMMUNICATIONS INITIATED USING THIRD PARTY DEVICES IN LIMITED NETWORK CONNECTIVITY ENVIRONMENTS

Resumen de: US20260342579A1

Embodiments of the present invention provide a system for usage-based seeding of pre-stored hidden authorization codes for high exposure communications initiated using third party devices in limited network connectivity environments. The system is configured to identify initiation of a communication, via a resource distribution device, by a user using a third party device, determine that the communication requires authorization, initiate authorization of the communication initiated by the user by causing an entity application stored on the user device to extract an authentication code stored in a secure vault of the user device, automatically populate the authentication code on the third party device, and determine that the authentication code matches an entity generated authentication code, where the entity generated authentication code is transmitted by the entity associated with the user, determine that the authorization of the communication is successful, and complete the communication initiated by the user, via the user device.

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.

QUANTUM RANDOM NUMBER GENERATOR PROVENANCE AND SECURITY ANALYSIS

Nº publicación: US20260342848A1 29/10/2026

Solicitante:

CISCO TECH INC [US]
Cisco Technology, Inc.