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SYSTEM AND METHOD FOR LONG-DISTANCE QUANTUM-CAPABLE INTERNET

Resumen de: AU2024440837A1

A Quantum-enabled Internet (QEI) including quantum-enabling networking architectures integrating advanced communication systems with long-distance quantum communication hardware and methods of operating the same. Using a quantum-network (QN) design paradigm, there is provided a physics-centric stack-based quantum network paradigm to govern the dynamics of multiple light-matter Hamiltonians across distant nodes. This QN network facilitates a fundamental long-distance quantum network service - that of high-visibility Hong-Ou-Mandel interference of telecom quantum states generated in two independent, telecom-compatible quantum light-matter interfaces separated by a distance. The QN paradigm design can be applied to demonstrate scalable long-distance QN services in an QN infrastructure, including the transmission of polarization entanglement created by high repetition sources of entangled photons and the storage of telecom polarization entanglement using remotely located quantum memories capable of heralding the storage of entanglement using non-demolition measurements and quantum state tomography.

MULTI-WAY FUSION CIRCUITS FOR PHOTONIC QUBITS

Resumen de: AU2024438646A1

Multi-way fusion circuits can perform fusion operations on three or more input qubits, each of which may initially be part of a separately-entangled system of qubits. When the fusion operation succeeds, the three or more input qubits are consumed in a projective entangling measurement that also results in creating a single entangled system that includes the remaining qubits of the initial separately-entangled systems.

QUANTUM COMPUTING ERROR MITIGATION

Resumen de: AU2025222342A1

This disclosure relates to a method for mitigating error of a solution from a quantum processor. The method comprises performing by a classical processor the steps of receiving the solution from the quantum processor. The solution comprises spin states of each spin corresponding to an outcome of performing a quantum computation on the quantum processor to minimise the Hamiltonian energy representing an optimisation objective function of the spins. The method further comprises determining a test spin-group in the solution; determining changes to the Hamiltonian energy of the solution for alternative test spin-group states; and upon determining that at least one change reduces the energy of the solution, determining target spin-groups, and flipping the target spin-group to an alternative target spin-group state to mitigate the error in the solution.

EFFICIENT QUANTUM MEMORIES VIA SHADOW TOMOGRAPHY

Resumen de: AU2024412983A1

One example aspect of the present disclosure is directed to directed to a method for measuring a first quantum state via a quantum computing system (QCS). The method includes receiving a first copy of the first quantum state. A first copy of a second quantum state is received. The second quantum state is a conjugate state of the first quantum state. A first value is determined. Determining the first value may is on measuring, via the QCS, a first observable of the first copy of the first quantum state. A second value is determined. Determining the second value is based on measuring, via the QCS, the first observable of the first copy of the second quantum state. An approximation of the first quantum state is determined. Determining the approximation of the first quantum state is based on the first value and the second value.

QUANTUM RESOURCE ACCESS CONTROL THROUGH CONSENSUS

Resumen de: US20260187514A1

0000 A quantum computing system determines that a quantum process seeks access to a quantum resource implemented by the quantum computing system. It is determined that a particular contract of a plurality of contracts governs access to the quantum resource, the contract identifying a condition of the quantum computing system that is to be met prior to granting access to the quantum resource. Information is sent to a plurality of computing devices indicating that the quantum process seeks access to the quantum resource. Condition determinations are received from the computing devices, each condition determination indicating whether the condition is met. Access to the quantum resource is granted or denied based at least in part on the plurality of condition determinations.

COMPUTING A NOISE CHANNEL FOR A MULTI-QUBIT QUANTUM OPERATION DESCRIBED BY A LINDBLAD EQUATION

Resumen de: US20260187515A1

A method, system and computer program product for computing noise channels for multi-qubit quantum operations. The learned Lindbladian describing the dynamics of a multi-qubit operation is received. The learned Lindbladian refers to a Lindbladian operator that has been derived or learned from data, such as low-weight observable measurements. The learned Lindbladian is then analyzed, such as using the ideal gate Hamiltonian (Hg) on n qubits, to identify the noise terms. A noise channel is then computed using a perturbative approach based on the identified noise terms. Examples of the perturbation approach include the Magnus expansion or the Dyson expansion. By using such a perturbative method to compute the noise channel, such a computation is performed in a controlled manner which exploits the locality of noise to reduce the complexity yet results in an accurate noise channel that correctly predicts how the physical noise acts on the qubits.

QUANTUM COMMUNICATION CHANNELS

Resumen de: US20260187511A1

0000 Systems and methods are described that can obtain at least a first quantum measurement associated with a qubit determined based on a first set of parameter values, and a second quantum measurement associated with the qubit determined based on a second set of parameter values and cause a ground state associated with the qubit to be estimated based on at least the first quantum measurement, the second quantum measurement, and at least one relationship between at least the first set of parameter values and the second set of parameter values.

ASSESSMENT OF QUANTUM DEVICE QUALITY USING MANY-BODY LOCALIZATION

Resumen de: US20260187517A1

0000 Systems/techniques that assess quantum device quality using many-body localization are provided. In various embodiments, a system can comprise a memory that stores computer executable components and a processor that executes the computer executable components stored in the memory. In various embodiments, the computer executable components can comprise a characterization component that can characterize qubits of a quantum device. In various aspects, characterizing qubits of the quantum device can comprise executing, on the quantum device, quantum circuits with many-body localization (MBL) in parallel to cover a topology of the quantum device.

A PARAMETRICALLY PROGRAMMABLE DELAY LINE FOR QUANTUM INFORMATION

Resumen de: WO2026142690A2

A parametrically programmable delay line device comprises an ensemble of resonators 104, 106, 108, 110, 112, 114, 116, 118; and a nonlinear superconducting circuit element 120 parametrically coupled via parametric drives with the ensemble of resonators. The nonlinear superconducting circuit element implements a lumped element read-out /buffer mode. The ensemble of resonators may be implemented as superconducting transmission line resonators, lumped element resonators, acoustic resonators, or 3D cavity modes. The nonlinear superconducting circuit element may be implemented as a superconducting nonlinear asymmetric inductive element (SNAIL), a superconducting quantum interference device (SQUID), or an asymmetrically threaded SQUID (ATS) 122, The device may be implemented as a metal on substrate, such as aluminum, niobium, or tantalum on silicon or sapphire.

METHOD AND SYSTEM TO ESTIMATE RISK FOR A SOFTWARE APPLICATION DUE TO QUANTUM THREAT

Resumen de: US20260187252A1

Conventional risk estimation techniques perform dynamic analysis of application or use models which require training data. Present disclosure provides method and system to estimate risk for a software application due to quantum threat by static analysis. A set of records pertaining to the application is received and parsed to obtain application, crypto and platform parameters. In addition, list of quantum vulnerable algorithms, number of Qubits required to break a cryptographic algorithm used by the application and a current Qubit number are also received. Then, value of Quantum Day is determined based on the current Qubit number and the number of Qubits required to break the cryptographic algorithm used by the application. Further, SOD (Severity, Occurrence, Detection) scores are calculated for each parameter, and they are multiplied to determine Risk Priority Number (RPN) for each parameter. Finally, RPNs of all parameters are summed up to estimate overall risk of the application.

ARCHITECTURE OPTIMIZED SYNTHESIS OF QUANTUM ALGORITHMS

Resumen de: WO2026139128A1

This application concerns a computer-implemented method for compiling an input unitary acting on a set of logical qubits to an output quantum circuit operable on a quantum system comprising a plurality of output qubits (1), wherein the output qubits (1) of the quantum system are arranged in accordance with a connectivity mesh (11), wherein nodes (111) of the connectivity mesh (11) represent possible sites for the output qubits (1) of the quantum system and each edge (112) of the connectivity mesh (11) indicates that quantum interactions between the output qubits (1) of the quantum system connected by one of the edges (112) are possible, comprising the following steps: providing the connectivity mesh (11) of the quantum system; assigning an index to each of the logical qubits; extracting a set of target labels (2) from the input unitary, wherein the target labels (2) correspond to a set comprising at least one of the indices of the logical qubits; compiling circuit building blocks (4) implementing a subset of the target labels (2), wherein the circuit building blocks (4) comprise body path gates (41) and/or leg gates (42) acting on the output qubits (1), wherein compiling the circuit building blocks (4) comprises: defining a tree (3) comprising a subset of edges (112) and a subset of nodes (111) of the connectivity mesh (11), wherein the tree (3) comprises a body (31) with at least one body node (1111) representing a site for an output qubit (1), wherein the body (31) comprise

MODULAR QUANTUM COMPUTING SYSTEM FOR DISTRIBUTED QUANTUM COMPUTATION VIA QUANTUM ENTANGLEMENT

Resumen de: US20260187508A1

A modular quantum computing system that enables distributed quantum computation across multiple quantum processing units (QPUs) that are remotely connected using a quantum entanglement network is disclosed. In order to execute a quantum circuit across multiple QPUs, any quantum state pertaining to any given multi-qubit gate of the quantum circuit may be teleported between two respective QPUs, such that an overall quantum compute capacity for executing the quantum circuit is expanded. Based on a number of QPUs that are allocated for executing the quantum circuit, buffers of established, pairwise quantum entanglement instances between respective sets of the allocated QPUs may be prepared and subsequently maintained prior to and during execution of the quantum circuit, in order to limit potential latency due to use of a quantum entanglement network within the execution of a given quantum circuit.

QUBIT PROCESSING METHOD

Resumen de: WO2026139470A1

There is provided a method for performing operations in a solid-state qubit processor. A provided (S100) logical qubit, comprising a plurality of data qubits, is extended (S102) and split (S104) to create two or more entangled portions. A first portion is shuttled (S106) in the qubit processor, separating it from a second portion, which may remain in place. During this shuttling process, faults may have occurred, which may have damaged or corrupted the first portion. Accordingly, a likelihood of fault is determined (S108), based upon a measurement operation. Based upon the likelihood of fault, the first portion or the second portion is selected (S110). In some examples, when selecting the first portion, the logical qubit is shuttled, and when selecting the second portion, the shuttling process is reversed and any potential damage or corruption to the first portion is reverted, with the logical qubit returned to its initial state. In this way, the method may provide a "logically reversible" shuttling operation.

NOISE LEARNING OF MEASUREMENTS WITH KNOWN STATE INITIALIZATION

Resumen de: US20260187516A1

One or more systems, devices, computer program products and/or computer-implemented methods of use provided herein relate to noise learning of measurements with known state initialization. For example, a system can comprise a memory that can store computer executable components and a processor that can execute the computer executable components stored in the memory. The computer executable components can comprise: an initialization component that can initialize a qubit with a known state to obtain state preparation errors of the qubit; a measurement component that can measure properties of the known state of the qubit; and an execution component that can perform, on a quantum system, cycle benchmarking for measurements on the qubit within a quantum circuit to obtain, by using the properties of the known state, a noise model of the measurements that determines state errors of the qubit from the state preparation errors.

ARTIFICIALLY INTELLIGENT COMPILATION OF QUANTUM CIRCUITS

Resumen de: US20260187507A1

Systems/techniques that facilitate artificially intelligent compilation of quantum circuits for quantum computing are provided. In various embodiments, a system can receive a quantum circuit. In various aspects, the system can synthesize, via a reinforcement learning model, the quantum circuit into a sequence of Pauli rotations of form exp(iθP), where P is a multi-qubit tensor product of Pauli matrices, that is supported by a quantum computing architecture with Pauli rotations as a gate set.

MULTI-WAY FUSION CIRCUITS FOR PHOTONIC QUBITS USING HADAMARD INTERFEROMETERS

Resumen de: WO2026143193A1

Multi-way fusion circuits using Hadamard interferometers can perform fusion operations on four or more input qubits, each of which may initially be part of a separately-entangled system of qubits. When the fusion operation succeeds, the four or more input qubits are consumed in a projective entangling measurement that also results in creating a single entangled system that includes the remaining qubits of the initial separately-entangled systems.

QUANTUM COMPUTATIONAL SOFTWARE PRIMITIVE FOR GENERAL QUANTUM CHANNELS

Resumen de: US20260187506A1

0000 Systems/techniques that facilitate a quantum computational software primitive for general quantum channels are provided. In various embodiments, a system can comprise a processor that executes computer executable components stored in a memory. In various aspects, the computer executable components can comprise an input component that receives a quantum channel circuit. In various embodiments, the computer executable components can further comprise a decomposition component that decomposes one or more quantum channels in the quantum channel circuit into an ensemble of quantum circuits. In various instances, the computer executable components can further comprise an execution component that executes, on a quantum system, the ensemble of quantum circuits. In various embodiments, the computer executable components can further comprise a computation component that determines a probability distribution of the one or more quantum channels based on the executing of the ensemble of quantum circuits.

MODE-MATCHING COLLECTED ION FLUORESCENCE TO A SINGLE MODE FIBER WITH INTERCHANGEABLE IMAGING

Resumen de: US20260188536A1

0000 Aspects of the present disclosure relate to a quantum information processing (QIP) system that includes an ion trap inside a vacuum enclosure with a vacuum window. The QIP system includes an imaging objective, located at a first position, configured to focus light emitted through the vacuum window from a trapped ion into a single mode (SM) fiber at a second position. The QIP system includes a first camera, a second camera, a pick-off mirror, and an imaging lens, used in combination to align the imaging objective and the SM fiber in order to minimize (1) an objective tilt angle between an optical axis of the imaging objective and a normal axis to the vacuum window and (2) a fiber tilt angle between an axis of the SM fiber and the optical axis of the imaging objective.

SELF-PRUNING FRACTAL COMPUTATIONAL ARCHITECTURE FOR HIGH-PERFORMANCE COMPUTING ON RESOURCE-CONSTRAINED AND NOISY QUANTUM HARDWARE

Resumen de: WO2026139942A1

A computational architecture employing self-pruning fractal branch management for achieving supercomputer-class performance on standard hardware and noisy intermediate-scale quantum (NISQ) devices. Unlike conventional parallel computing systems requiring massive hardware resources or genetic algorithms requiring extensive population evolution, this invention utilizes hierarchical fractal doubles—modular computational units organized in self-similar tree structures—with real-time adaptive pruning eliminating non-promising solution branches based on geometric performance metrics computed via √2-scaled fractal analysis. Controlled perturbations (branch shaking) inject stochastic exploration preventing premature convergence while pruning maintains computational efficiency. The system achieves quantum-competitive performance on classical hardware through fractal interference patterns mimicking quantum superposition, and enables NISQ quantum computers to operate effectively despite hardware noise by pruning decoherence-corrupted branches before they contaminate computation. Core innovation: geometric pruning criterion comparing branch trajectory fractal dimension against optimal threshold, triggering instant elimination of branches exhibiting non-productive exploration patterns. Applications include neural architecture search, protein folding simulation, quantum system modeling, combinatorial optimization, and multi-agent coordination—all achieving 10-100× speedup versus c

QUANTUM ERROR DETECTION METHOD, QUANTUM ERROR DETECTION DEVICE, AND QUANTUM ERROR DETECTION PROGRAM

Resumen de: WO2026140041A1

This quantum error detection device generates a logical state |+⟩ L, 1 of a first quantum error detection code that is a quantum error detection code representing one logical qubit by n1 physical qubits and is a quantum error detection code having a code distance d1. The quantum error detection device executes a logical Rz rotation gate operation of the first quantum error detection code with respect to the logical state |+⟩ L, 1 of the first quantum error detection code, thereby generating a logical state |+θ⟩ L, 1 of the first quantum error detection code. The quantum error detection device executes a sequence of unitary quantum gate operations with respect to the logical state |+θ⟩ L, 1 of the first quantum error detection code, thereby converting the logical state |+θ⟩ L, 1 of the first quantum error detection code into a second quantum error detection code representing one logical qubit by n2 (n2 > n1) physical qubits. The quantum error detection device acquires an error syndrome of a logical state |+θ⟩ L, 2 of the second quantum error detection code.

OPTIMIZING APPARATUS, OPTIMIZATION METHOD, AND MEDIUM

Resumen de: US20260187182A1

An optimizing apparatus includes processing circuitry configured to: acquire an original-problem solution which is a solution satisfying a constraint of a combinatorial optimization problem including a plurality of target factors to be combined; divide the plurality of target factors into a plurality of groups on a basis of the original-problem solution, and generate a subproblem being set for each of the plurality of groups; find a solution to the subproblem generated by the subproblem generating unit; generate a candidate solution to the original problem on a basis of the obtained solution to the subproblem; and determine whether it is possible or not possible to update the original-problem solution on a basis of a result of comparison between the generated candidate solution and the acquired original-problem solution.

SINGLE-DETECTOR BELL-STATE MEASUREMENT DEVICE

Resumen de: EP4769978A1

A Bell state measurement device comprising first and second optical input fiber to respectively pass first and second photon comprising a first component and a second component, and a third component and a fourth component, an optical beam splitter configured to receive first and second photon respectively from first and second optical input fiber and to combine first and second photon into third and fourth photon; first and second optical output fiber to receive third and fourth photon, the second optical output fiber comprises a delay line; and a single-photon detector configured to receive third and fourth photon from first optical output fiber, or delayed third photon and delayed fourth photon from second optical output fiber, or third photon from first optical output fiber and delayed fourth photon from second optical output fiber, or fourth photon from first optical output fiber and delayed third photon from second optical output fiber.

TENSOR NETWORK ANNEALING METHOD AND SYSTEM FOR OPTIMIZATION OF MACHINE LEARNING TASKS

Resumen de: EP4769234A1

A computer-implemented method for performing computational optimization in machine learning and data science involves a system equipped with at least one processor and memory. This method encompasses storing vectors, defining vector-scalar multiplication, and configuring the processor to operate as an annealer. Key steps include transforming a multivariable binary function into a matrix product state (MPS) format, constructing the MPS with a specific bond dimension, and decomposing vectors for optimal efficiency. The method employs a maximal bond dimension for the tensor train, determining its final state, and utilizes tensor network compression techniques to compress the matrix product state. It addresses Quadratic Unconstrained Binary Optimization (QUBO), frequently used in machine learning, to optimize binary functions. Additionally, the system includes a computer program product and a computer-readable data carrier for executing this method, providing a robust framework for annealing tasks and optimization using memory and processor configurations designed for matrix product state representation and compression.

TUNEABLE COUPLER

Resumen de: EP4769240A1

0001 An electronic circuit for a superconducting quantum processor unit is provided. The electronic circuit comprises a first group of circuit elements configured as a first superconducting qubit, a second group of circuit elements configured as a second superconducting qubit, and a third group of circuit elements comprising a ferromagnetic Josephson junction and configured as a tuneable coupler. The tuneable coupler is for selectively coupling the first superconducting qubit to the second superconducting qubit based on a magnetisation state of the ferromagnetic Josephson junction. A method of entangling superconducting qubits is also provided.

QUANTUM ENHANCED MISINFORMATION DETECTION AND PREVENTION

Nº publicación: EP4769245A1 01/07/2026

Solicitante:

AMERICAN EXPRESS TRAVEL RELATED SERVICES CO INC [US]
American Express Travel Related Services Co., Inc.

Resumen de: EP4769245A1

0001 System, method, and computer program product embodiments detect misinformation based on received inferencing data that includes textual or media content. A data vector is derived from one or more samples of the inferencing data. Quantum computing hardware is commanded to select a plurality of features of the data vector using a quantum approximate optimization algorithm (QAOA). Quantum computing hardware is commanded to classify the inferencing data as one of misinformation or genuine information using a quantum support vector machine (QSVM) provided with the selected plurality of features of the data vector. A signal based on the classification is received, and based on the signal indicating that the classification made by the QSVM is indicative that the content includes misinformation, a notification or alert to a human user or an automated system is generated, warning that the content includes misinformation.