47 results about "Quantum control" patented technology

A quantum information processing system may comprise a quantum mechanical system capable of exhibiting transitions between a plurality of eigenstates; and a quantum control environment, wherein the quantum control environment eigenstates is capable of exhibiting modes from a continuous spectrum and is coupled to the quantum mechanical system at at least one coupling location, wherein said coupling is characterized with a set of parameters of the quantum mechanical system, and wherein a selected combination of the at least one coupling location and the set of parameters intentionally causes to suppress at least one of said transitions when intentionally changing a state of the quantum mechanical system by the quantum control environment.

Apparatus and method for a low-power quantum controller. For example, one embodiment of an apparatus comprises: a low-power quantum control chip to process a first portion of quantum program code associated with a quantum computing application, the low-power quantum control chip configurable within a dilution refrigeration unit, the low-power quantum control chip comprising: an interface to couple the quantum control chip to a computer which is to execute a second portion of the quantum program code associated with the quantum computing application; a Static Random Access Memory (SRAM) to store the first portion of quantum program code; a compute unit to execute the first portion of quantum program code during execution of the quantum computing application and responsively generate control signals; routing hardware logic to route the control signals; a plurality of digital signal processor (DSP) units coupled to the routing hardware logic, at least one DSP of the plurality of DSPs to receive one or more of the control signals and responsively generate analog qubit control signals to control qubits of a quantum processor.

The invention belongs to the field of quantum computing, and particularly relates to a distortion correction method for a quantum measurement and control link and a quantum computer, and the method comprises the steps: carrying out fractional expansion on a system function in a general expression form, and obtaining a system function expressed by a subitem of a target system function and a sum of products of corresponding coefficients, the target system function subitems are determined according to signal response characteristics of the quantum measurement and control link and comprise a pure zero item, a real pole item and a complex pole item, the pure zero item represents impulse response of finite length of the quantum measurement and control link, the real pole item represents exponential response of the quantum measurement and control link, and the complex pole item represents impulse response of finite length of the quantum measurement and control link. The complex pole item represents the oscillation attenuation response of the quantum measurement and control link; determining the reciprocal of the system function of the quantum measurement and control link as a distortion correction digital filter; a distortion correction digital filter is arranged on the quantum measurement and control link to correct signal distortion of the quantum measurement and control link. According to the invention, the distortion of the quantum measurement and control link can be rapidly corrected.

The application discloses a kind of based on ensemble rare earth ions double quantum bit controlled gate construction method, it is related to quantum control technical field, it includes to double quantum bit frequency site selection, and respectively as control bit, target bit;Utilize the blocking effect generated by the dipole-dipole interaction between double quantum bits to construct controlled gate, including: to control bit apply light pulse driving control bit is from ground state transition to excited state;To target bit apply single quantum gate to drive its evolution, and apply compensation pulse;To control bit apply light pulse driving control bit from excited state de-excitation to ground state.The application utilizes the interaction of the light pulse and quantum system medium that can be optimized to produce arbitrary geometric quantum logic gate on target quantum bit, and simultaneously by using the blocking effect caused by dipole-dipole interaction, the evolution of target bit quantum bit can be constrained by control bit.

Provided are quantum control methods and systems. The method includes generating a control pulse in a quantum system, determining a measurement of a state of the quantum system in response to the control pulse, determining a control pulse correction based on the control pulse, the measurement of the state of the quantum system, and a model reference state, modifying the control pulse based on the control pulse correction, resulting in a modified control pulse, and generating the modified control pulse in the quantum system.

The application discloses a synchronous triggering system and method and a quantum control system, and the synchronous triggering system comprises a central control device, a plurality of routing board cards and a plurality of function board cards, and the synchronization triggering of a triggering signal is ensured through a three-stage triggering synchronization system, wherein the first stage provides a plurality of groups of triggering signals for the corresponding routing board cards for the central control device, and the initial time of the output of each group of triggering signals is adjusted so that the time when each cabinet receives the triggering signal is the same; the second stage is that the communication lines from each routing board card to the plurality of function board cards connected thereto are equal in length; and the third stage is that the triggering signals reach the plurality of data processing devices at the same time after the AND operation processing of the AND gate chips so as to synchronously trigger the data processing devices.

The application discloses a phase screen-based array photonic orbital angular momentum beam quantum control system, and belongs to the technical field of quantum control.The application is used for solving the problem of mutual overlapping and interference among sub-beams of an array photonic orbital angular momentum beam.The application comprises a laser, a beam shaping unit, a polarization control unit and a quantum state control unit;the beam shaping unit is used for spatially filtering and expanding a laser beam generated by the laser to generate parallel light beams;the polarization control unit is used for performing polarization control on the parallel light beams output by the beam shaping unit to generate linearly polarized light beams with horizontal polarization states;the quantum state control unit is used for performing array photonic orbital angular momentum control on the linearly polarized light beams to obtain array photonic orbital angular momentum light beams, and each sub-beam in the array is independent;and the application can be used for generating array photonic orbital angular momentum light beams with independent sub-beams through a compact optical path.

A messaging system for a distributed quantum system (e.g. a quantum control system and / or a quantum error correction unit). The system has a plurality of real-time units (e.g. decoders, sequencers or

The invention discloses a clock triggering unit of a quantum measurement and control system, a related method, a system and equipment. The unit comprises a main control module, a clock distribution circuit and a trigger, the master control module configures and manages the clock distribution circuit and the trigger, and works based on a clock distributed by the clock distribution circuit; the primary clock distributor is used for distributing a plurality of primary clock output signals based on an input reference signal of a reference source, and respectively providing the primary clock output signals to the main control module and the plurality of secondary clock distributors; the secondary clock distributor selects a signal distribution mode according to the frequency of the reference source, and outputs multiple paths of secondary clock output signals to a first signal interface of the measurement and control case based on the distribution mode and the primary clock output signal; and the trigger is used for processing trigger signals output by each port of the main control module and outputting the processed trigger signals to the second signal interface of the measurement and control case. Multiple paths of high-quality triggering and clock signals can be output, the signal frequency can be flexibly selected, and the requirements of multiple quantum bits for clock signals with different frequencies are met.

The application belongs to the field of quantum information, and discloses a quantum control system and a quantum computer, wherein the quantum control system comprises at least one signal processing device and at least one radio frequency transceiver device, each of the signal processing devices comprises a first backboard, a plurality of first signal processing board cards, a plurality of second signal processing board cards and a routing board card are plugged on the backboard connector of the first backboard, the plurality of first signal processing board cards and the plurality of second signal processing board cards are connected with the routing board card; the second signal processing board card is used for generating a low-frequency signal; the radio frequency transceiver device is connected with the first signal processing board card, and the radio frequency transceiver device and the first signal processing board card connected therewith are used for generating and receiving a high-frequency signal. The quantum control system has high integration and strong expansibility, and the system has good overall coordination, so that the measurement and control requirements of a high-qubit quantum chip can be met.

The present invention is synthetic neurons and networks with feedback quantum tunneling memristors designed to mimic biological neurons. The memristor hardware is formed from a 4.2 nm thick layer of atomic layer deposited ionic hafnium oxide and niobium metal and inserted in the positive and negative feedback of an analog spiking oscillator. When operated at room / warm temperatures, these memories have memristive properties and enable the artificial neuron circuits to produce adaptive spiking behavior. When neural networks are formed of the synthetic neurons, pronounced hybrid chaotic / non-chaotic modes with increased complexity are observed and itinerant behavior emerges. Cryogenic cooling of the memristors into the superconducting Josephson tunneling regime at 8.1 K reveals the influence of quantum control effects.

In a quantum computer, quantum algorithms are performed by exciting a qubit with a quantum control pulse. This quantum control pulse is an electromagnetic RF signal that is generated at baseband according to an analog waveform. An application digitally generates samples of this analog waveform using multiple classical processors that control multiple physical channels in parallel.

Examples described in this disclosure relate to sub-kelvin control systems and methods for scalable quantum control. An example system includes a first cooling sub-system operable to maintain an operating temperature for a first device within a first sub-kelvin temperature range. The system further includes a second cooling sub-system, separate from the first cooling sub-system, operable to maintain an operating temperature for a second device, different from the first device, within a second sub-kelvin temperature range. The first sub-kelvin range may comprise a range between 50 milli-kelvin (mK) to 999 mK and the second sub-kelvin range may comprise a range between 1 mK to 299 mK. The combination of the first cooling sub-system and the second cooling sub-system is configured to maintain a temperature gradient between the first device and the second device despite the first device and the second device being in close proximity to each other.

The application discloses an instruction processing system, method, quantum control system and quantum computer. The instruction processing system comprises a state starting module, a cycle period determining module and a data generating module. The state starting module is used for sending a data output request according to a waveform parameter instruction sent by an upper computer. The cycle period determining module is used for determining a cycle clock period according to a first quantity of waveform data output by the data generating module in a single clock period and the amplitude repetition number. The data generating module is used for generating waveform data of rising edges and falling edges of a pulse signal waveform according to a starting amplitude, an amplitude repetition number, an amplitude increment and a total quantity of waveform data in each cycle clock period in response to the data output request and outputting the waveform data. The application adopts a waveform parameter instruction to generate waveform data of a pulse signal in a lower computer, can solve the problems that a large quantity of waveform data of the pulse signal is sent to the lower computer to occupy memory and slow transmission affects the computing efficiency of quantum computing, and can greatly improve the computing efficiency of quantum computing.

This disclosure relates to quantum computing systems including a quantum processor that implements one or more operations on multiple qubits and a distributed data processing system programmed to perform calculations to determine control sequences that, when applied to the quantum processor, reduces decoherence, decoherence-induced errors, and control-imperfection-induced errors on the one or more operations on the multiple qubits. A user interface device remote from the distributed data processing system receives from a user of the quantum processor characteristics of the quantum processor including operational constraints and / or desired performance, and sends the characteristics to the data processing system to cause the data processing system to perform the calculations to determine the control sequence based on the characteristics.

In a quantum computer, quantum algorithms are performed by a qubit interacting with multiple quantum control pulses. The quantum control pulses are electromagnetic RF signals that are generated digitally at baseband and sent, via asynchronous ports, to DACs that feed an RF upconversion circuit. For synchronization, each asynchronous port is coupled to a multi-tap delay line. The setting of the multi-tap delay line is determined by a function of the port's setup-and-hold time. This function is trained, via machine learning, to be applicable across a variety of ports.

The invention discloses a double-quantum-bit controlled gate construction method based on ensemble rare earth ions, and relates to the technical field of quantum control, and the method comprises the steps: carrying out the site selection of double-quantum-bit frequency, and taking the double-quantum-bit frequency as a control bit and a target bit; a controlled gate is constructed by using a blocking effect generated by dipole-dipole interaction between double quantum bits. The method comprises the following steps: applying an optical pulse to a control bit to drive the control bit to transition from a ground state to an excited state; applying a single quantum gate to the target bit to drive the target bit to evolve, and applying a compensation pulse; and applying an optical pulse to the control bit to drive the control bit to be de-excited from the excited state to the ground state. According to the invention, any geometric quantum logic gate is generated on a target quantum bit by utilizing the interaction of optimizable light pulses and a quantum system medium, and meanwhile, the evolution of the target bit quantum bit can be restrained by a control bit by utilizing a blocking effect caused by dipole-dipole interaction.

A method for robust state manipulation in quantum information processing comprises evanescently coupling a first waveguide to a second waveguide, the first and second waveguide having different geometries respectively; and providing waveguide geometries such that their coupling is detuned, the detuning being a function of the geometries, the detuned coupling thereby providing reliable population transfer between the first and second waveguides that is robust to fabrication and other errors. The method may be used to provide a quantum optical coupler.

This application discloses a method, device, and medium for supply chain security management in rural cooperatives. The method includes: dynamically generating temporary access keys by extracting and quantifying business context factors such as season, logistics, transactions, and land status to achieve fine-grained access control; analyzing cross-module business feature tensors using quantum support vector machines to achieve associated abnormal behavior detection and risk classification; triggering a graded collaborative response mechanism based on risk levels to implement precise protection while ensuring business continuity; and finally achieving full-link verifiable auditing based on quantum-secure blockchain. This application deeply integrates a quantum-secure encryption system with multimodal business data in the supply chain, constructing a three-layer closed-loop security architecture of "quantum control, business anomaly detection, and dynamic resource optimization." This architecture can resist quantum computing attacks, achieve synergistic optimization of security strategies and business efficiency, and provide rural cooperatives with a supply chain management platform that offers forward-looking security and high operational availability.

A method for robust state manipulation in quantum information processing comprises evanescently coupling a first waveguide to a second waveguide, the first and second waveguide having different geometries respectively; and providing waveguide geometries such that their coupling is detuned, the detuning being a function of the geometries, the detuned coupling thereby providing reliable population transfer between the first and second waveguides that is robust to fabrication and other errors. The method may be used to provide a quantum optical coupler.

Encoding a target state on a quantum computing system (QCS) using a classical computer to model the QCS using a time-dependant Schrodinger equation: the equation includes boundary conditions (BCs) pro

A method for robust state manipulation in quantum information processing comprises evanescently coupling a first waveguide to a second waveguide, the first and second waveguide having different geometries respectively; and providing waveguide geometries such that their coupling is detuned, the detuning being a function of the geometries, the detuned coupling thereby providing reliable population transfer between the first and second waveguides that is robust to fabrication and other errors. The method may be used to provide a quantum optical coupler.

The application discloses a waveform distortion calibration method and device, a quantum control system and a quantum computer. First, a set of initial parameters is obtained according to distortion compensation results by using a compensation signal, a frequency modulation signal and a quantum state modulation signal. Then, each parameter corresponding to a maximum ground state probability of a quantum bit in a random benchmark test result in a first range is obtained as a target parameter by using an optimization search algorithm and the random benchmark test. Finally, the value of the initial parameter is updated based on the target parameter, and the compensation signal after the update is used to calibrate the frequency modulation signal of the quantum bit. The application optimizes the parameters of the model of the compensation signal by using the optimization search algorithm, and does not need to perform a large number of measurement sampling operations, thereby effectively improving the measurement efficiency of the waveform distortion and the test efficiency of the quantum chip.

In a general aspect, a quantum control device includes a substrate having a substrate surface. An insulator layer is disposed over the substrate surface and defines a cavity. The insulator layer includes an insulator surface that defines an opening to the cavity. The quantum control device also includes a field-responsive layer over the insulator surface. The field-responsive layer includes a target region that resides over the opening to the cavity. The quantum control device additionally includes a projection extending from the substrate into the cavity and terminating at a tip. The projection is configured to produce an electric field that interacts with a quantum state in the target region. The tip resides in the cavity and configured to concentrate the electric field produced by the projection.

A circuit device includes a plurality of driver circuits, each driver circuit configured to output a respective current, and a switch network including a plurality of switch network inputs. Each switch network input of the plurality of switch network inputs is coupled to an output of a respective driver circuit of the plurality of driver circuits to receive the respective current from the respective driver circuit, a switch network output, one or more control inputs, and a plurality of switches. The switch network is configured to adjust one or more switches of the plurality of switches to provide, to a quantum computing circuit at the switch network output, an output signal including a sum of a subset of the currents from the plurality of driver circuits, the subset of the currents corresponding to the one or more control signals.

A kind of quantum echo state network model construction method for aero-engine fault early warning, first, the time series data of aero-engine is quantized;Then, quantum state data is used as the input of the first layer quantum network, after the action of quantum recursion circuit, the probabilistic output is obtained by quantum measurement, and then is transmitted to the reserve pool of the second layer echo state network to obtain a high-dimensional intermediate state;Finally, the output layer weight matrix can be obtained by least square method only once calculation, and the network training is completed.The trained quantum echo state network model is applied to aero-engine fault prediction, and the engine operation state prediction data with high accuracy at future time is given.The present application uses quantum controlled non-gate to realize entangled state, and approximately represents the coupling relationship that may exist between original input data, and quantum rotation gate is set as adjustable parameter of the first layer quantum network, so that the distribution of data can be adjusted;And echo state network layer can play the advantages of fast calculation, and one-step training can complete the calculation of final model.

This application discloses a quantum control system and an instruction execution method. The quantum control system includes: a scheduler, an instruction memory, a plurality of processing units, and corresponding private instruction caches (PICs). The scheduler is configured to determine k sub-circuits executed in parallel in a quantum circuit, k being an integer greater than 1 and not greater than n; obtain instructions respectively corresponding to the k sub-circuits from the instruction memory, and respectively store the instructions into PICs respectively corresponding to k processing units. A target processing unit of the k processing units is configured to obtain an instruction corresponding to a target sub-circuit of the k sub-circuits from a PIC corresponding to the target processing unit for execution, the k processing units executing respective corresponding instructions in parallel. A solution of sub-circuit-level parallelism disclosed in this application has better scalability when facing more complex quantum applications and ever-increasing qubits.

Methods and systems for performing robust phase estimation of single- and multi-qudit gate operations using single-flux quantum (SFQ) control may include: obtaining an indication of a plurality of qudits, wherein at least one qudit of the plurality of qudits is controlled with SFQ control; obtaining an indication of a model representative of the plurality of qudits and single- and multi-qudit gate operations, the model comprising one or more tunable and, optionally, non-tunable parameters; initializing the one or more tunable parameters of the model; using the one or more tunable and, optionally, non-tunable parameters to design one or more quantum circuits; using the one or more tunable parameters' values of the model to set SFQ control parameters; using the SFQ control parameters to execute the one or more quantum circuits; performing a quantum measurement of one or more qudits of the plurality of qudits; and analyzing results of the quantum measurement to infer experimental values of the tunable and, optionally, non-tunable model parameters.

A method for transmitting control signals from a classical interface of a quantum computer to a quantum processing unit (QPU) of the quantum computer is disclosed, where the quantum computer includes a plurality of communication channels between the classical interface and the QPU. The method includes receiving, at a central processing unit (CPU) of the classical interface, a digital control signal describing a quantum circuit to be performed by the QPU; compressing, at the CPU, the digital control signal using a preselected compression scheme; generating, at the CPU, a sequence staggering configuration indicating one or more delays to be applied to transmission of the compressed digital control signal and a map indicating a number of bits to be transmitted over each of the plurality of communication channels; outputting, from the CPU to a programable logic unit of the classical interface, the compressed digital control signal, the sequence staggering configuration and the map; splitting, at the programable logic unit, the compressed digital control signal into one or more sub-streams using the map and sequence staggering configuration; and transmitting, from the programable logic unit to the QPU, the one or more sub-streams, wherein the sub-streams are transmitted with the one or more delays.

The invention discloses a construction method of an arbitrary non-adiabatic sum quantum logic gate of a rare earth ion system, and relates to the technical field of quantum computing. Comprising the following steps: firstly, designing a beveling evolution path with a degree of freedom in a Bloch ball; the degree of freedom is beveled; the evolution path is a random path; converting the evolution path into the amplitude and phase parameters of the optical pulse required for controlling the three-energy-level system through reverse engineering; then generating a group of double-color light pulses by using an arbitrary wave generator and an acousto-optic modulator based on the amplitude and phase parameters; and finally, controlling the quantum state coupled by the light field by using the two-color light pulse so as to construct the non-adiabatic harmony quantum logic gate. The constructed logic gate shows relatively strong robustness to inherent frequency detuning (non-uniform broadening) of an ensemble system and light intensity distribution errors in an experiment, and the accuracy and stability of quantum control in an actual noise environment are remarkably improved.