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SIMULATION OF QUANTUM CIRCUITS

Resumen de: US20260268190A1

0000 Methods, systems and apparatus for simulating quantum circuits including multiple quantum logic gates. In one aspect, a method includes the actions of representing the multiple quantum logic gates as functions of one or more classical Boolean variables that define a undirected graphical model with each classical Boolean variable representing a vertex in the model and each function of respective classical Boolean variables representing a clique between vertices corresponding to the respective classical Boolean variables; representing the probability of obtaining a particular output bit string from the quantum circuit as a first sum of products of the functions; and calculating the probability of obtaining the particular output bit string from the quantum circuit by directly evaluating the sum of products of the functions. The calculated partition function is used to (i) calibrate, (ii) validate, or (iii) benchmark quantum computing hardware implementing a quantum circuit.

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.

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.

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.

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.

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.

SILICON-BASED PHOTONIC QUANTUM MEMORY DEVICES AND METHODS FOR FORMING THE SAME

Resumen de: US20260267064A1

0000 A quantum memory device includes: a waveguide configured to spatially confine paths of photons therein; a memory cell that includes a micro-ring resonator (MRR), a frequency tuner, and a quantum memory material portion, wherein the MRR includes a first segment that is parallel to a segment of the waveguide, wherein the frequency tuner is configured to modulate a photon resonance frequency in the MRR by modifying an effective refractive index within, or around, a second segment of the MRR, and wherein the quantum memory material portion includes a quantum memory material having a ground state and an excitation state that stores photons therein and located within or on a third segment of the MRR; and a control circuit configured to modulate the photon resonance wavelength in the MRR during a first step of a photon capture operation to match a predefined wavelength, and to generate captured photons in the MRR.

CLIFFORD-IN-MEMORY MODULAR FAULT-TOLERANT QUANTUM COMPUTING ARCHITECTURE

Resumen de: US20260268200A1

One or more systems, devices, computer program products and/or computer-implemented methods of use provided herein relate to modular fault-tolerant quantum computing. 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 operation component that performs, on a quantum processor, stabilizer operations on logical qubits encoded in a quantum error correction code. The computer executable components can further comprise an execution component that performs, on the quantum processor, universal quantum operations on the logical qubits using the stabilizer operations, wherein the stabilizer operations consume magic state.

情報処理プログラム、情報処理方法、および情報処理装置

Resumen de: US20260260710A1

A computer-readable recording medium stores therein a program for causing a computer to execute a process, the process includes calculating an energy of a molecule, based on an energy of each of a plurality of fragments obtained by dividing a structure of the molecule by a molecule dividing method, the calculating the energy including: calculating, for a first fragment among the plurality of fragments, a first problem using a first Hamiltonian corresponding to the first fragment, and calculating a first energy corresponding to the first fragment using a result of calculating the first problem; and calculating, for a second fragment among the plurality of fragments and corresponding to a second Hamiltonian identical or similar to the first Hamiltonian, a second energy corresponding to the second fragment using a result of calculating the first problem.

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>.

METHOD AND QUANTUM HARDWARE FOR QUANTUM ERROR CORRECTION

Resumen de: EP4804090A1

0001 A method for quantum error detection and/or correction according to a quantum error correction code that comprises at least one stabilizer operator acting on at least two data qubits (11), the method comprising: providing a quantum hardware (100, 100', 1000, 1000a, b, c, d, e) which comprises the at least two data qubits (11), a syndrome qubit (12a, b) and a multiqubit coupler (1) for the qubits (11, 12a, b); operating the qubits (11, 12a, b) and the multiqubit coupler (1) according to a syndrome measurement circuit associated with the at least one stabilizer operator to thereby retrieve an error syndrome of a quantum state of the data qubits (11) associated with the at least one stabilizer operator.

CIRCUIT COMPILATION METHOD FOR QUANTUM ERROR MITIGATION

Resumen de: EP4804087A1

0001 According to an aspect of an embodiment, operations include obtaining initial quantum circuit comprising entangling gates to generate first randomized quantum circuits by applying RC protocol on initial quantum circuit. The operation further includes obtaining first combined measurement results by executing first plurality of randomized quantum circuits on quantum computer. The operation includes generating plurality of random noise-magnified quantum circuits by applying ZNE protocol on initial quantum circuit. The operation further includes generating second randomized quantum circuits by applying RC protocol on each random noise-magnified quantum circuit and obtaining second combined measurement results by executing second plurality of randomized quantum circuits on quantum computer. Finally, operation includes generating final measurement results for initial quantum circuit by applying extrapolation method on first combined measurement results and second combined measurement results.

Controlling execution of a quantum algorithm

Resumen de: GB2704433A

A system for controlling execution of a quantum algorithm that includes a processing unit (CPU 201) wherein the system uses memory-mapped addressing to access data memory that stores a measurement and indicates completion related to the algorithm. The quantum algorithm measurement operation may include determining the final state of a quantum system or extracting a single data point from a computation. The measurement data memory (referred to as Quantum Collapse Memory, QCM 202) may be composed of memory components (blocks) such as DATA RAM 205, VALID RAM 206, DONE section 207 and MASK RAM 208. The system may apply a partition mask to define and selectively store portions of a larger measurement dataset in the DATA section. CPU 201 may interact with the data memory 202 via interconnect 220, issuing instructions such as load/store instructions to access the quantum operation measurement result. The measurement data memory may be implemented as part of an FPGA, ASIC (Application-Specific Integrated Circuit) or other hardware or simulated in a software environment. The data memory may also be part of a Very-Large-Scale Integration (VLSI) system, or a software simulation of a computer system. Fig 2

Ion shuttling system control

Resumen de: GB2704546A

An ion shuttling control system 300 is disclosed for use in trapped ion quantum computing. The ion shuttling control system includes a controller 302 configured to generate a first operation code, the first operation code indicating a first ion manipulation operation of a plurality of ion manipulation operations and a first set of electrodes of a plurality of sets of electrodes 362 of an ion trap; a plurality of digital-to-analog converters (DACs) 354 configured to generate a first set of analog waveforms, the first set of analog waveforms being selected based on the first operation code; and a switching network 356 configured to provide the first set of analog waveforms to the first set of electrodes, the first set of electrodes being selected based on the first operation code. Figure 3

INCOHERENT APPROXIMATIONS OF LEAKAGE FOR EFFICIENT SIMULATIONS OF NOISY QUANTUM COMPUTATIONS

Resumen de: WO2025101869A1

Methods, systems and apparatus for determining an effect of uncontrolled quantum state transitions in a noisy quantum computation performed by a quantum computing device, where the noisy quantum computation comprises execution of a quantum circuit that is represented by one or more quantum channels. In one aspect, the uncontrolled quantum state transitions are approximated as incoherent uncontrolled quantum state transitions through application of a random phase approximation to the one or more quantum channels to obtain a modified quantum circuit that is represented by one or more incoherent quantum channels. The incoherent quantum channels preserve incoherence between computational subspaces and environmental subspaces for the one or more quantum channels. A simulation of the modified quantum circuit is then performed using a qubit simulation of the modified quantum circuit.

EXECUTING QUANTUM PROGRAMS ON MODULAR QUANTUM PROCESSING UNITS

Resumen de: WO2025096761A1

In a general aspect, quantum programs are executed on modular quantum processing units in a quantum computing system. In some implementations, a method includes receiving a quantum program including a sequence of quantum logic operations; decomposing the sequence of quantum logic operations into an equivalent sequence of quantum logic gates; and segmenting the sequence of quantum logic gates into an equivalent sequence of quantum circuit widgets. Each quantum circuit widget includes a subset of the quantum logic gates in the sequence and corresponds to a time slice of the quantum program. The quantum circuit widgets are compiled to produce a set of compiled quantum circuit widgets to be executed on multiple quantum processor modules of the quantum computing system.

QUANTUM COMPUTING ARRANGEMENT, QUANTUM COMPUTING SYSTEM COMPRISING A PLURALITY OF SAID QUANTUM COMPUTING ARRANGEMENTS AND METHOD OF IMPLEMENTING A QUANTUM ERROR CORRECTION CODE ON SAID QUANTUM COMPUTING ARRANGEMENT OR SYSTEM

Resumen de: WO2025093134A1

The present invention is related to a quantum computing arrangement comprising a plurality of qubits, to a quantum computing system comprising a plurality of said quantum computing arrangements, to a method of implementing, on a quantum computing system, a quantum error correction code, said quantum computing system comprising the quantum computing arrangement, and to the use of a quantum computing system or a quantum computing arrangement for implementing a quantum error correction code.

OPTICAL BEAM POSITIONING AND CONTROL FOR QUANTUM COMPUTING

Resumen de: WO2025094047A1

Apparatus (20) for quantum computing includes an ion trap (24), which is configured to hold a first array of ions (40) in respective positions along an array axis (38). A radiation source (28) is configured to emit a second array of beams of coherent radiation, including first beams having respective first intensities (64) and having frequencies chosen to excite selected internal transitions of the ions and second beams having second intensities (66) at least ten times greater than any of the first intensities, and to switch respective locations of the first and second beams within the second array. Optics (82) focus the beams into the ion trap such that each beam in the second array is incident on a respective ion in the first array.

FREQUENCY PLAN GENERATOR FOR MULTI-QUBIT PROCESSORS

Resumen de: US20250148335A1

0000 With a computerized frequency plan generator, for each node in a quantum lattice: determine a list of possible frequencies subject to at least one of nearest neighbor and next nearest neighbor collision constraints; and assign a highest possible frequency; apply a collision cleaning routine to the quantum lattice with the assigned frequencies until at least one of a condition where there are no remaining collisions and a condition where collision count ceases to improve; and apply a frequency perturbation routine to the collision-cleaned quantum lattice to move apart at least one of a high-risk nearest neighbor collision and a high risk next nearest neighbor collision.

OPTIMIZATION TO MITIGATE FREQUENCY CROWDING IN MULTI-QUBIT PROCESSORS

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.

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.

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.

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.

QUANTUM PROCESSING SYSTEMS

Nº publicación: EP4802428A1 09/09/2026

Solicitante:

SILICON QUANTUM COMPUTING PTY LTD [AU]
Silicon Quantum Computing Pty Ltd

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.