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ERROR MITIGATION FOR QUANTUM COMPUTING

Resumen de: AU2025426849A1

One example aspect of the present disclosure is directed to a method for operating a quantum computing system (QCS) that includes a set of qubits. The method includes generating a set of noisy data by repeatably measuring a noisy observable of a quantum circuit operating on the set of qubits. The set of noisy data and the noisy observable are subject to noise associated with the quantum circuit and each datapoint of the set of noisy data is associated with an eigenvalue of the noisy observable. The noisy data is modeled as a hybrid distribution, which includes a combination of a noiseless distribution and a noise-only distribution. Each datapoint of the set of noisy data is assumed to have a hidden label as coming from either the noiseless distribution or the noise-only distribution. This label is estimated for each datapoint, based on the eigenvalue associated with the datapoint, and a constructed model for any of the hybrid distribution, the noise-only distribution, and the noiseless distribution. This may require additional data to be taken from the QCS to model the noise-only distribution. A target quantity is determined based on either the model for the noiseless distribution or the datapoints combined with their attached labels.

QUANTUM DEVICE

Resumen de: US20260268195A1

A quantum device includes a quantum bit element that includes a first diamond crystal layer having a first center point and having a shape extending in four directions from the first center point, a second diamond crystal layer having a second center point and having a shape extending in four directions from the second center point, and a color center present in one of the first diamond crystal layer and the second diamond crystal layer, the first diamond crystal layer and the second diamond crystal layer being stacked so that at least parts of the first center point and the second center point overlap each other, a first optical waveguide connected to each of four first ends of the first diamond crystal layer, and a second optical waveguide connected to each of four second ends of the second diamond crystal layer.

VERFAHREN, VORRICHTUNG, QUANTENCOMPUTER, COMPUTERPROGRAMM UND COMPUTERLESBARES SPEICHERMEDIUM ZUR ERHÖHUNG EINER KOHÄRENZZEIT WÄHREND EINER QUANTENBERECHNUNG

Resumen de: DE102025108884A1

Ein Verfahren zur Erhöhung einer Kohärenzzeit während einer Quantenberechnung mit mindestens zwei Qubits ist angegeben, wobei das Verfahren umfasst:- Anlegen eines Quantengatters an die mindestens zwei Qubits,- Anlegen einer Signalsequenz an die mindestens zwei Qubits zumindest während einer Evolutionszeit des Quantengatters, so dass die Kohärenzzeit der mindestens zwei Qubits während der Quantenberechnung erhöht wird, wobei- die Signalsequenz mindestens zwei Signalsequenzblöcke umfasst,- jeder Signalsequenzblock eine Amplitude und eine Phase aufweist,- mindestens zwei Phasen von aufeinanderfolgenden Signalsequenzblöcken voneinander verschieden sind, und- die Amplitude vorbestimmt ist, um Rabi-Oszillationen für die mindestens zwei Qubits zu induzieren, wobei die Rabi-Oszillationen eine verstimmte Frequenz haben, die nah-resonant mit einer Fallenfrequenz ist.Ferner werden eine Vorrichtung, ein Quantencomputer, ein Computerprogramm und ein computerlesbares Speichermedium angegeben.

RESONATOR TUNING

Resumen de: US20260269803A1

A method for exciting a resonator at an estimated resonance frequency of the resonator comprises: (a) varying a frequency of an input signal applied to the resonator while recording an output signal from the resonator; (b) for each of a series of frequency values of the input signal, computing noise-filtered, complex first and second derivatives of a ratio of the output signal to the input signal; (c) for each of the series of frequency values of the input signal, computing a real part of a dot product of the complex first and second derivatives as vectors projected onto a complex plane; and (d) exciting the resonator an excitation frequency where the real part vanishes.

EXPONENTIAL QUANTUM ADVANTAGE FOR MEASURING FERMIONIC OPERATORS

Resumen de: AU2025214821A1

Method, systems, and apparatus for measuring fermionic operators. In one aspect, a method includes obtaining an input comprising k-body Majorana operators, a predefined precision, and copies of a tensor product of a quantum state and the quantum state. For each Majorana operator, a basis to measure the Majorana operator in is determined. The input is processed to obtain expectation values that correspond to the Majorana operators. A graph is constructed by, for each non-zero expectation value, adding a vertex to the graph that represents a Majorana operator that corresponds to the non-zero expectation value and adding edges between vertices in the graph that represent anticommuting Majorana operators. A vertex coloring algorithm is applied to the graph. For a color that corresponds to the Majorana operator, a simultaneous eigenbasis of Majorana operators in the graph with the color is determined. The Majorana operator is measured in the determined basis.

INTEGRATED PULSE OPTIMIZER AND SIMULATOR FOR HIGH-FIDELITY TWO-QUBIT GATES ON TRAPPED IONS

Resumen de: US20260268189A1

Technologies for simulating and optimizing electromagnetic pulses are disclosed herein. A quantum computing system generates, based on a specification of one or more system parameters, one or more control values, and one or more noise offsets, a controlled environment for a quantum computing system. The quantum computing system simulates, as a function of the control values, one or more pulses within the controlled environment. One or more candidate pulses are identified based on an evaluation of the simulated pulses. A sequence comprising properties of at least one of the candidate pulses is returned.

CLASSICAL-QUANTUM HYBRID APPROACH TO MULTI-HOP ROUTING IN CARGO LOGISTICS

Resumen de: AU2025235576A1

An optimal route can be determined for delivering an item through a logistics system where vehicles have multiple stops when traveling along routes. The optimal route is determined using a hybrid system employing a classical computing device and a quantum annealer. The classical device reduces the search space that allows the quantum annealer to determine a more optimal solution. In an aspect, a routing graph comprising nodes and edges is populated from routes of vehicles, where the nodes identify locations and the edges represent routing data. At least a portion of the nodes and edges is removed to form a refined routing graph. For an origin–destination input, the refined routing graph can be filtered according to a first set of routing constraints to form a reduced route search space. A quantum annealer is invoked according to an objective and a different second set of routing constraints.

QUANTUM CIRCUITS FOR UNITARY EVOLUTION OF LOW-ENERGY STATES

Resumen de: AU2025261035A1

Methods, systems, and apparatus for Hamiltonian simulation of low-energy initial quantum states. In one aspect, a quantum circuit that performs unitary time evolution for a Hamiltonian is determined. The Hamiltonian is mapped to a corresponding gap-amplifiable Hamiltonian with a low energy subspace, the gap-amplifiable Hamiltonian comprising one or more matrices, where each matrix comprises a respective block encoding that is dependent on a parameter λ. An intermediate Hamiltonian is determined, where eigenvalues of the intermediate Hamiltonian are the same as eigenvalues of a square root of the gap-amplifiable Hamiltonian. A block encoding of the intermediate Hamiltonian divided by the square root of λ is determined. A filter is applied to the block encoding to obtain a polynomial approximation of the unitary time evolution operator for the Hamiltonian. The quantum circuit is applied to an initial state that is supported in the low-energy subspace.

Parallel Cross Entropy Benchmarking

Resumen de: US20260268187A1

Methods, systems and apparatus for benchmarking quantum computing hardware. In one aspect, a method includes defining an initial circuit configured to operate on an array of qubits, wherein the initial circuit comprises multiple instances of the two-qubit gate, wherein each instance of the two-qubit gate performs a same operation on a respective pair of neighboring qubits in the array; partitioning the initial circuit into multiple layers, wherein instances of the two-qubit gate in a respective layer can be implemented in parallel; for each of the multiple layers: constructing benchmarking circuits for the layer, wherein each benchmarking circuit for the layer comprises one or more cycles of quantum gates, each cycle comprising: the layer of instances of the two-qubit gate, and a plurality of single qubit gates; implementing the constructed benchmarking circuits to obtain experimental benchmarking data; and adjusting control parameters of the control model using the experimental benchmarking data.

QUANTUM BIT ARRAY AND METHOD OF CONTROLLING QUANTUM BIT

Resumen de: US20260268192A1

In a dynamic resonance frequency changing method, there is a problem in phase tracking, and there is a concern that an error of a single-qubit gate occurs. The solution is a method of controlling a quantum bit that controls a spin state of a quantum bit formed by a charge trapped in a semiconductor device. The method includes: when controlling a spin state of a quantum bit formed by a target charge specified by a first line and a second line formed in the semiconductor device, executing a first step of measuring at least one of a current and a charge amount flowing through the first line and the second line; and executing a second step of controlling at least one of the current and the charge amount flowing through the first line and the second line based on a measurement result of the first step.

SYSTEM FOR PERFORMING A QUANTUM GATE AND OPERATION OF A QUANTUM ERROR CORRECTING CODE USING THIS QUANTUM GATE

Resumen de: US20260268201A1

A quantum system for performing a quantum gate comprises a command circuit for selectively applying radiation, a number of data resonators equal to or greater than two, each data resonator having a respective resonance frequency and being coupled to the command circuit for stabilizing a respective data cat qubit, and an ancilla resonator having an ancilla resonance frequency coupled to the command circuit for stabilizing an ancilla cat qubit and being non-linearly coupled via the command circuit to the data resonators. The command circuit is arranged to perform a quantum gate by: while stabilizing the ancilla cat qubit, applying a radiation having the ancilla resonance frequency such that the data resonators and the ancilla resonator are substantially simultaneously subject to a Hamiltonian resulting from the radiation, and turning off the radiation after a chosen duration. This principle is extended to perform a quantum correction error code.

SIMULATION DEVICE, SIMULATION METHOD, AND PROGRAM

Resumen de: US20260268035A1

A simulation device includes: a tensor contraction calculation unit that performs a contraction calculation in a tensor network corresponding to a quantum gate operation on the basis of the states of qubits in a quantum circuit and information indicating a quantum gate operation to be applied to the qubits; a matrix product state composition unit that composes a matrix product state from the states of the qubits obtained as a result of the contraction calculation by the tensor contraction calculation unit; and a low-rank approximation calculation unit that performs a low-rank approximation for each of a plurality of quantum gate operations lumped together when the matrix product state composition unit composes the matrix product state.

QUANTUM SYSTEM FOR PERFORMING A CNOT GATE AND QUANTUM SYSTEM FOR PERFORMING A REPETITION CODE USING THE SAME

Resumen de: US20260268188A1

A quantum system for performing a CNOT gate is disclosed, wherein the quantum system comprises a command circuit for providing radiation, a target cat qubit device and a control qubit device, coupled linearly, and wherein the target cat qubit comprises a non-linear element that is an Asymmetrically Threaded Superconducting Quantum Interference Device (ATS) and which serves two purposes: engineering the 2-photon conversion Hamiltonian for cat qubit stabilization and engineering the CNOT Hamiltonian for performing a CNOT gate with the control qubit device. At any point in time, the ATS serves either the role of cat qubit stabilization or the role of CNOT gate.

PROBABILISTIC ANGLE INTERPOLATION

Resumen de: US20260268194A1

A method of implementing a rotation gate having a selectable rotation angle using a quantum device with discretised gates each having a discrete gate angle setting, the method comprising: (i) receiving an instruction to apply a rotation gate having a selected rotation angle; (ii) determining at least three discretised gates, based on the selected rotation angle, each having different discrete gate angle settings; (iii) determining a relative frequency; (iv) selecting one of the determined discretised gates based on the determined relative frequency; (v) applying the selected discretised gate to a qubit; (vi) measuring the state of the qubit to provide an output; (vii) repeating steps (iv)-(vi) a plurality of times; and (viii) combining the outputs from step (vi) to obtain a combined output based on the selected discretised gates.

ELECTRON SPIN CONTAINING MATERIALS AND METHODS FOR PRODUCING SAID MATERIALS

Resumen de: US20260265062A1

The invention generally relates to new electron spin containing materials and in particular methods of preparing such materials in order to spatially separate electron spins from atmospheric oxygen and moisture.

QUANTUM DEVICE AND METHOD OF CONTROLLING QUANTUM DEVICE

Resumen de: US20260267068A1

A quantum device includes a plurality of quantum bit elements each including a diamond crystal layer and a color center, the diamond crystal layer having a central portion and extending portions connected to the central portion and extending in 2n directions (n is an integer of 2 or more) from the central portion, the color center being formed in the central portion, an input optical waveguide that is connected to each of n ends of the extending portions and transmits light introduced into the color center, an output optical waveguide that is connected to each of n ends of the extending portions and transmits a photon emitted from the color center, and a branching element connected to the output optical waveguide of a first quantum bit element of the quantum bit elements and the output optical waveguide of a second quantum bit element of the quantum bit elements.

SYSTEMS AND METHODS FOR OPTIMIZING SPIN QUBIT READOUT

Resumen de: WO2025091074A1

Aspects of the present disclosure provide mechanisms to optimize qubit readout using known readout techniques. To do so, some aspects of the present disclosure control a tunneling rate between a qubit being measured and a charge sensor/reservoir. If PSB based readout is desirable for a quantum processing system, aspects of the present disclosure increase the asymmetry of the tunneling rates between two quantum dots tunnel-coupled to the SET/reservoir. If reservoir readout is desirable for a quantum processing system, aspects of the present disclosure adjust the tunneling rate between a quantum dot and the SET/reservoir for improved efficiency of the readout method.

DECODER FOR QUANTUM REPETITION CODE IN ONE DIMENSION

Resumen de: EP4804089A1

A method of correcting errors in a repetition code protected quantum memory, comprising an initial step of measuring parities between adjacent qubits along a one dimension presentation of the code, and locating apparent defects on a map of said one dimension presentation of the code on the basis of the measured parities, and a subsequent treatment step during which each site of the map is associated with a local automaton, the local automaton displacing apparent defects along the map on the basis of a simulated attractive interaction between apparent defects, said interaction being simulated with local memory and communicated from site to site, the automaton erasing apparent defects by pairs when pairs of apparent defects become adjacent on the map.

QUANTUM PROCESSING SYSTEMS

Resumen de: WO2025091073A1

Aspects of the present disclosure provide a quantum processing device comprising: a nuclear spin register comprising at least two nuclear spin qubits; at least one unpaired electron coupled to the nuclear spin register; and a control system configured to: control and/or readout the electron spin qubit; control and/or readout a nuclear spin qubit; and reduce errors arising from dipolar coupling between the nuclear spin qubits and/or between the electron spin and nuclear spins.

MAGNETIC INTERFERENCE REDUCTION DEVICES AND SYSTEMS

Resumen de: US20250142796A1

0000 An interference reduction device is provided. The interference reduction device may include a magnetic shield positioned in proximity of a magnetic field. The magnetic shield is configured to reduce interference on the magnetic field along the direction of the magnetic field. The magnetic shield may include a cutout approximately parallel to the direction of the magnetic field, the cutout is configured to reduce a distortion caused by the magnetic shield on the magnetic field.

SYSTEMS AND METHODS FOR A VIRTUAL FACILITY AND A VIRTUAL FACILITY WORLD MODEL

Resumen de: US12288293B1

A virtual facility system may include a storage system, a data engine, an integration system, a virtual facility interface system, and a simulator engine. The storage system may store data including video of the real facility. The data engine may train a neural rendering model of the real facility based on the data providing a photorealistic three-dimensional representation of the real facility. The integration system may provide one or more interfaces facilitating communication with one or more control systems associated with the real facility including a management system providing historical or live inventory tracking data and facility operations process data characterizing of locations and tasks corresponding with inventory items or materials stored or handled in the real facility. The virtual facility interface system may provide access to information stored in a virtual facility. The simulator engine may simulate novel views generated based on the neural rendering model.

HARDWARE-EFFICIENT NEUTRAL ATOM QUANTUM COMPUTING METHOD AND DEVICE

Resumen de: EP4804088A2

The present disclosure relates to a device and a method for quantum computing using a plurality of neutral atoms in an array of optical traps, wherein a first internal state of the neutral atoms serves as qubit ground state |o>, and a second internal state serves as qubit excited state |1>. According to the present disclosure, a local single-qubit gate operation on a qubit may be performed comprising locally and selectively illuminating the qubit prepared in a superposition state |s> of qubit ground state |o> and qubit excited state |1> with a qubit addressing laser at a first qubit addressing laser frequency to cause a differential Stark shift for the qubit ground state |o> and the qubit excited state |1>, Further, a local two-qubit gate operation may be performed on a pair of qubits comprising locally and selectively illuminating the pair of qubits prepared in the qubit ground state |o> with the qubit addressing laser at a second qubit addressing laser frequency for coupling the pair of qubits to a Rydberg state |r> of the neutral atoms preferably via a third internal state c> of the neural atoms that can serve as an intermediate state of a two-photon transition from the qubit ground state |o> to the Rydberg state |r>.

DYNAMIC SIGNAL CONTROL SYSTEMS AND METHODS

Resumen de: WO2025096317A1

Various embodiments provide methods, apparatuses, systems, or computer program products for providing dynamic control of a signal. In an example embodiment, a system comprises a signal generator, a controller configured to control operation of the signal generator, a first signal path between the signal generator and an output connected to an electrode of an ion trap, and a selectively connectable second signal path between the signal generator and the output to bypass the low pass filter. The signal generator is configured to generate a signal comprising a first frequency component having a first range of frequencies and/or a second frequency component having a second range of frequencies higher than the first range of frequencies. The first signal path comprises a low pass filter to filter noise above the first range of frequencies. The second signal path comprises a bandpass filter to permit the second frequency component to pass from the signal generator to the output.

HIGH-FREQUENCY CASCADE READOUT

Resumen de: WO2025093253A1

A circuit for reading out the state of a qubit 100 having singlet and triplet spin states comprising: a double quantum dot 101 forming a qubit 100 comprising first and second quantum dots 105, 106. The circuit comprises a cascade quantum dot 102 capacitively coupled to the second quantum dot 106; a charge reservoir 103 tunnel coupled to the cascade quantum dot 102; and readout circuitry 104 coupled to the reservoir 103. When a charge carrier tunnels between the first and second quantum dots 105, 106, a charge carrier tunnels between the cascade quantum dot 102 and the charge reservoir 103. A frequency source connected to a gate electrode or the charge reservoir 103 is configured to apply an alternating potential 111 at a first frequency, h, thereby to cause cyclic tunnelling of a charge carrier only when the qubit is in the singlet state which can be detected by the resonator circuit 104.

OPTIMIZATION TO MITIGATE FREQUENCY CROWDING IN MULTI-QUBIT PROCESSORS

Nº publicación: EP4802426A1 09/09/2026

Solicitante:

IBM [US]
International Business Machines Corporation

Resumen de: WO2025093256A1

Define a plurality of qubit collision types and a plurality of constraints. For a group of qubits, use a computerized mixed-integer programming solver to, subject to the constraints, iteratively minimize collisions by minimizing a sum of products of weights multiplied by an amount of frequency collisions for given ones of the constraints of each one of the collision types. Output a frequency tuning plan for the group of qubits, based on the iterative minimization. Facilitate tuning physical qubits in accordance with the frequency tuning plan.