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SYSTEMS AND METHODS FOR ENTANGLEMENT-CASCADED QUANTUM KEY DISTRIBUTION (QKD)

Resumen de: US20260332400A1

0000 Systems and methods for entanglement-cascaded quantum key distribution are disclosed. The processor determines set of communication parameters to be transmitted between quantum transmitter and quantum receiver. The processor generates entangled pair of qubits including first set of qubits and second set of qubits. The processor performs first quantum operation associated with first secret key on second qubits of first set of qubits and second set of qubits. The processor swaps second qubit of quantum transmitter with second qubit of receiver. The processor generates entangled qubit pairs by performing quantum entanglement operation on first qubit of quantum transmitter and second qubit of quantum receiver. The processor determines quantum measurement operation to be applied to entangled qubit pairs. The processor performs second quantum operation and generates measurement result for each of entangled qubit pairs. The processor transmits generated shared classical secret key from quantum transmitter to quantum receiver over secure communication channel.

Underwater Computing System with Wireless Energy Transfer, Hybrid Multi-Layered Communication Architecture, and AI-Driven Autonomous Control

Resumen de: US20260329354A1

An underwater computing system comprises one or more sealed computing modules configured to operate submerged in a body of water. Each sealed computing module includes a pressure-resistant hull enclosing computing hardware. A wireless energy transfer system delivers electrical energy from an energy generation facility to the sealed computing modules without physical power cables. A buoyancy control system adjusts module depth within the water. A thermal regulation subsystem transfers heat to the surrounding water. A hybrid communication architecture couples the modules to a surface communication hub via a plurality of distinct channels including fiber-optic, power-line, quantum, acoustic, and optical communication. An AI control unit autonomously manages power distribution, thermal regulation, buoyancy adjustment, and workload distribution in real time based on environmental sensor data. A secure closed-loop mode gate selectively restricts communications to authenticated control instructions and health telemetry.

System and method to perform dynamic quantum-based distribution and encryption of keys in a network

Resumen de: US20260332399A1

A system comprises at least two devices equipped with one or more quantum processors. The system may be configured to coordinate operations between the one or more quantum processors to establish, control, and/or monitor encryption keys in a network. The encryption keys are concealed through multiple encryption layers as the encryption keys are shared between one or more nodes, devices, and/or network components. The system is configured to develop one or more protocols that may be used to maintain and/or control security of shared encryption keys in the network.

IMPROVED RECEIVER FOR DISCRETE-VARIABLE QKD AND QKD SYSTEM COMPRISING THE SAME

Resumen de: EP4827040A1

The present invention relates to a quantum key distribution receiver for a discrete variable QKD protocol comprising an optical circuit adapted to receive a signal from an emitter, split it into several states and temporally multiplex the different states at fixed time-differences, a unique single-photon detector adapted to detect said states in specific time-bins at said fixed time-differences, wherein said receiver is adapted to control said unique single-photon detector in gated mode so as to effectively activate the detector to create detection gates at said specific time-bins, the choice of the time-bins corresponding to the choice of the measurement basis of the qubits, and activate the detector to create extra detection gates at additional security time-bins different from said specific time-bins.

SINGLE-CLICK PROTOCOL FOR REMOTE STATE PREPARATION WITH A WEAK COHERENT PULSE SOURCE

Resumen de: WO2026216996A1

The present disclosure presents a single-click protocol for use in a quantum network, nodes of such quantum network, and related methods. The quantum network includes client nodes, server nodes, and measurement nodes, wherein at least one client node is operatively coupled via a first quantum communication link with at least one measurement node, and wherein at least one server node is operatively coupled via a second quantum communication link with the at least one measurement node, wherein the at least one server node and the at least one client node are configured to transmit quantum states toward the measurement node for remote state preparation, and wherein the server node and the client node are configured to receive heralding signals from the measurement node, wherein the measurement node is configured to transmit the heralding signals upon using a single-click protocol.

COMPUTING SYSTEMS AND METHODS FOR EVALUATING ENTROPY OF A RESULTS STRING FOR USE IN SECURITY APPLICATIONS

Resumen de: WO2026215638A1

A computer-implemented method for evaluating entropy of a results string representing a set of measurement or computation results output by a computing device, to determine suitability of the results string for use in security. The method comprising generating a first estimate of a polytope representing a set of probability distributions that includes a set of allowable behaviours, wherein the first polytope estimate comprises a bounded region within multidimensional space in which the boundaries represent estimated limits for the set of allowable behaviours. The method comprises iteratively refining the first polytope estimate by: determining one or more behaviours within the polytope estimate which are inconsistent with behaviours allowed by quantum mechanics, determining constraints on the set of allowable behaviours, and modifying the boundaries of the polytope estimate to generate a refined polytope estimate. The method also comprises checking compliance of the evaluated entropy of the results string with a required minimum entropy.

DOUBLE-SINGLE-CLICK PROTOCOL FOR REMOTE STATE PREPARATION WITH A WEAK COHERENT PULSE SOURCE

Resumen de: WO2026216997A1

The present disclosure presents a double-single-click protocol for use in a quantum network, nodes of such quantum network, and related methods. The quantum network includes client nodes, server nodes, and measurement nodes, wherein at least one client node is operatively coupled via a first quantum communication link with at least one measurement node, and wherein the at least one server node is operatively coupled via a second quantum communication link with at least one measurement node, wherein the at least one server node and the at least one client node are configured to transmit quantum states toward the measurement node, and wherein the at least one server node and the at least one client node are configured to receive heralding signals from the measurement node, wherein the measurement node is configured to transmit the heralding signals upon using a double-single-click protocol.

Operating a Layered Quantum Networking Environment with Fidelity Estimates

Resumen de: US20260322502A1

A first message is sent from a first node in a network indicating that a first quantum element at the first node is entangled with a second quantum element at a second node in the network. The first message comprises a first estimate of a fidelity of entanglement between the first and second quantum elements, and a timestamp indicating a time associated with the first estimate. Based at least in part on the first message, a second estimate of a fidelity of the entanglement between the first and second quantum elements is generated, at a second time after the time indicated by the timestamp, and is compared to each of multiple thresholds. At least a first (second) action is performed in response to a result of comparing the second estimate to a first (second) threshold.

QUANTUM KEY DISTRIBUTION CALIBRATION SETUP AND METHOD THEREOF

Resumen de: US20260322595A1

The present invention relates to Calibration system for calibrating a QKD emitter comprising said QKD emitter provided with a light source for generating light and an output connector for exiting the generated light, and a telecom characterization setup located at the output connector characterized in that the calibration system further comprises a pair of switchable connectors adapted to be switched between a first position where the connectors are exposed to the outside of the QKD emitter and a second position where the connectors are internally connected for providing a light path from the light source to the output connector, and an optical amplifier connected to the connectors switched in the first position for calibration procedure.

POST-QUANTUM SAFE MUTUAL AUTHENTICATION COMMUNICATION SYSTEMS

Resumen de: US20260322594A1

Devices, systems, and methods for post-quantum (PQ) secure (PQS) communications are provided. A method includes authenticating, by a device and with a first server, using a legacy device identity, receiving and installing, by the device, a firmware upgrade that provides the device an ability to communicate in a PQS manner, establishing a PQS communication channel between the device and a second server, mutually authenticating, by the device and with the second server, using a PQ identity (PQI) of the device, the PQI different from the legacy identity, and responsive to successful mutual authentication, communicating between the device and the second server, using the PQS communication channel.

QUANTUM HOLOGRAPHIC SIGNATURE WITH QUANTUM FOURIER SIGNATURE TRANSFORMER AND ENCODING HARMONIZER

Resumen de: US20260320592A1

Apparatus and methods for securing a transaction. The apparatus may include a holographic signature pad. The holographic signature pad may include an array of sensors. The sensors may be configured to sense a first quantum tunneling pattern resulting from interaction between a pen and the signature pad. The pad may be configured to create a holographic interference pattern based on the first quantum tunneling pattern. The apparatus may map the digitized interference pattern onto first qubits in a quantum register. The apparatus may be configured to interact with the quantum computer to apply a quantum Fourier transform algorithm to the first qubits to produce a quantum phase-space interference matrix. The apparatus may be configured to form a key-value pair that includes a key corresponding to a quantum encrypted fingerprint matrix and a value corresponding to the quantum phase-space interference matrix.

Cryptography system and method

Resumen de: GB2705434A

A cryptography system comprising a first quantum computer 2 wherein a first array of atoms comprises a first and second quantum states, the first array of atoms 6 having an initial configuration, a first quantum control module that generates predetermined output parameters to apply a quantum operation on the first array of atoms, converting the first array of atoms to a second configuration; and a first measurement module that determines the second configuration of the first array of atoms; and an encryption module 3 configured to generate an encryption key 5 based on the second configuration of the first array of atoms and to encrypt a data set using the encryption key. The cryptography system may optionally comprise a communication channel configured to transmit a public key and may be configured to transmit the public key from the first quantum computer to a second quantum computer or transmit the public key from a first party operating the first quantum computer to a second party operating the second quantum computer. The public key may comprise the initial configuration of the first array of atoms. The disclosure is also a cryptography method as such. Figure 1

양자 키 분배 네트워크를 위한 시스템 및 방법

Resumen de: WO2026151451A2

A system for implementing a quantum key distribution network, the system comprising: one or more quantum transmitters configured to transmit quantum encoded photons; a single state receiver, configured to receive the photons and determine encoded bits under a first protocol; a bell state receiver configured to receive quantum encoded photons under a second protocol; and a manager configured to determine a basis of encoding of the quantum encoded photons and to control communication between the one or more quantum transmitters and the single state receiver based on the first protocol or the bell state receiver based on the second protocol.

NONLOCALLY RANDOMIZED QUANTUM-AUGMENTED SECURITY

Resumen de: US20260312795A1

The inventors have developed methods and systems to address the above challenges using entangled photons with multiple colors transmitted with a classical data stream as a technique to detect eavesdropping on the data stream and to prevent reverse engineering for demodulating the entangled bits from the data stream. In some embodiments, a time gate is used to interleave the quantum and classic signals to provide quantum encryption of fiber optic communication protocols.

Method of Data Encryption with Recursive Semantic Fragmentation and MasterSeed Sealing

Resumen de: US20260312821A1

An encryption method and system for securing data through structure-aware semantic fragmentation. An input data stream is segmented into semantically meaningful fragments using a transformer-based neural network. Each fragment is bound by deterministic structural markers to create a tamper-evident chain. A Final Seed, derived from high-resolution timestamps and a hardware-anchored Personal Key, seeds a permutation function to shuffle the fragments. The system then applies a Quantum Lattice Transform to a subsequently derived MasterSeed, generating a post-quantum resilient symmetric key. This MasterSeed-derived key encrypts the permuted and bound fragments into a final secure payload. Decryption requires regenerating the exact permutation map and verifying the structural marker chain, ensuring data is protected against memory scraping and unauthorized access in decentralized environments.

QUANTUM RANDOM NUMBER GENERATION CAPABILITY VERIFICATION

Resumen de: WO2026209233A1

Example embodiments of the present disclosure are directed to quantum random number generation (QRNG) capability verification. In a method, an apparatus receives, from a network entity, a request for checking QRNG support of the apparatus. The apparatus obtains capability information about the QRNG support of the apparatus, the capability information being generated in a trusted execution environment (TEE) of the apparatus. The apparatus transmits, to the network entity, a response to the request, the response including the capability information.

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

Resumen de: WO2026209158A1

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. The N destination nodes have a first mask, and each of the N destination nodes has a respective second mask, and a respective local key. The method comprises generating, by the source node, a key mask by combining the key to be distributed and a local key of the source node and transmitting, by the source node, the key mask to a destination node of the N destination nodes. The destination node obtains the key by combining the received key mask, the respective local key of the destination node, the first mask, and the respective second mask of the destination node.

METHOD AND SYSTEM FOR ERROR CORRECTION IN QUANTUM CRYPTOGRAPHY COMMUNICATION

Resumen de: US20260312796A1

0000 A quantum cryptography communication method between a first communication device and a second communication device may include: a quantum communication step of generating a second information sequence based on a first information sequence by the second communication device, when the first communication device transmits the first information sequence generated by randomly modulating a phase or polarization of photons to the second communication device; and a post-processing step of adjusting the first information sequence and the second information sequence to be identical on the basis of an error correction mode selected based on a predetermined criterion. The error correction mode may be classified according to a subject of decoding parity information.

QUANTUM RANDOM NUMBER GENERATION CAPABILITY VERIFICATION

Resumen de: WO2026209236A1

Example embodiments of the present disclosure are directed to quantum random number generation (QRNG) capability verification. In a method, an apparatus obtains capability information about QRNG support of the apparatus. The capability information is generated in a trusted execution environment (TEE) of the apparatus. The apparatus transmits, to a device, a message including the capability information about the QRNG support of the apparatus. The message includes a TEE transparent container associated with the capability information.

QUANTUM RANDOM NUMBER GENERATION CAPABILITY VERIFICATION

Resumen de: WO2026209235A1

Example embodiments of the present disclosure are directed to quantum random number generation (QRNG) capability verification. In a method, an apparatus obtains capability information about QRNG support of the apparatus, the capability information being generated in a trusted execution environment (TEE) of the apparatus. The apparatus transmits, to a network entity, a request for registering the apparatus for QRNG usage, the request including the capability information.

METHOD, GROUND STATION AND SYSTEM FOR PROVIDING QUANTUM KEYS

Resumen de: WO2026209124A1

Provided is a method of providing quantum keys between two ground stations, the method comprising the steps of a) performing pairwise sharing of a first quantum key between the two ground stations using satellite-based quantum key distribution; b) generating, by a first ground station of the two ground stations, first further quantum keys; c) encrypting, by the first ground station, the first further quantum keys using the first shared quantum key; d) transmitting, by the first ground station, the encrypted first further quantum keys to a second ground station of the two ground stations, the second ground station being different from the first ground station; and e ) decrypting, by the second ground station, the encrypted first further quantum keys, thereby providing the quantum keys between the two ground stations.

SYSTEM AND METHOD FOR RANDOMNESS EXTRACTION AND METHOD OF PERFORMING QUANTUM CRYPTOGRAPHY

Resumen de: US20260312794A1

0000 A system and a method for randomness extraction for quantum cryptography and a method of performing quantum cryptography between two or more parties. The system for randomness extraction for quantum cryptography comprises a sampling module configured to sample a cryptographic key to generate one or more sub-blocks; an entropy module configured to determine a lower bound of the entropy in each sub-block, wherein the determining of the lower bound comprises consideration of correlations between each sub-block and unsampled bits of the cryptographic key and/or other sub-blocks; and a hashing module configured to hash each sub-block for randomness extraction on each sub-block.

CONTINUOUS AUTHENTICATION OF PEERS IN NETWORKS USING POST-QUANTUM PRE-SHARED KEYS

Resumen de: US20250175795A1

0000 Techniques and architecture are described for reauthentication of two IPsec peers, during a key refresh process. The peers may reauthenticate each other based upon a shared secret, which in configurations, is a PPK. In configurations the PPKs are stirred (mixed with DH/ECDH) during key derivation while refreshing the session keys during IKE_v2 and IPsec rekey. This may involve communicating the PPK-ID from a rekey initiator to a rekey responder by adding a PPK_ID payload in the rekey message exchange. This enables stronger quantum safe session keys, when dynamic PPK is used or when the manual PPK is rotated frequently. In configurations, the knowledge of the shared PPK is proved by having both peers exchange authentication payloads signed with a PPK. This involves exchanging a IKEv2 NOTIFY payload “AUTH_PPK” to carry PPK-signed authentication data. This serves the purpose of frequent re-authentication of the peers as part of the key refreshes.

PACKED SECRET SHARING-BASED GENERAL NON-INTERACTIVE ZERO-KNOWLEDGE PROOF METHOD AND SYSTEM

Resumen de: EP4819535A1

The present invention relates to the field of security protocols. Disclosed are a packed secret sharing-based general non-interactive zero-knowledge proof method and system. The method comprises: at a pre-computation stage, a prover and a verifier run a pre-processing algorithm to generate a verifiable random linear transformation pair required in a proof stage; in the proof stage, the prover runs a proof algorithm, computes a proof π, and sends the proof π to the verifier; and in a verification stage, the verifier runs a verification algorithm on the basis of the proof π and a corresponding common input, and verifies the correctness of execution of an arithmetic circuit C(w, x). According to the present invention, only an underlying MPC protocol needs to be run once, and the protocol can resist quantum computer attacks and does not depend on any algebraic structure. In addition, the protocol design scheme of the present invention is efficient and achievable, the proof time of the key knowledge proof of a lattice-based key encapsulation mechanism Kyber512 is only 1.08 seconds, the preprocessing time is 1.3 seconds, and the verification time is 1.16 seconds.

AI-DRIVEN SYSTEM AND METHOD FOR POSTHUMOUS ADAPTIVE AI TWIN EVOLUTION, QUANTUM-SECURED LEGACY PRESERVATION, AND MULTI-GENERATIONAL THERAPEUTIC INTERACTION WITH REGRESSION THERAPY

Nº publicación: EP4819151A1 07/10/2026

Solicitante:

WIEM CHIHA [BE]
Wiem, Chiha

Resumen de: EP4819151A1

0001 An Al-driven system and method for dynamic digital legacy preservation and multi-generational knowledge transfer, addressing the challenge of secure, emotionally intelligent legacy preservation across generations. 0002 The system integrates Adaptive Al Twins, a Quantum-Secured Legacy Vault with lattice-based cryptography, and virtual reality (VR) environments to enable posthumous Al evolution, milestone-based memory unlocking, and therapeutic memory retrieval. Key features include an Al-Guided Emotional Memory Structuring System for subconscious memory retrieval using NLP-based regression therapy, an Al-Driven Multi-Generational Knowledge Transfer System for real-time holographic interactions, and accessibility interfaces (e.g., EEG neuro-interfaces) for inclusive use. 0003 The system evolves through a continuous framework, from memory capture to a Mournalverse ecosystem, and supports lifelong Al Twin companionship for emotional coaching. It facilitates therapeutic memory retrieval, provides real-time mentorship, and ensures long-term legacy preservation, with scalability for future technologies like brain-computer interfaces.