20 results about "Quantum logic" patented technology

Pulse-generator-based reciprocal quantum logic (RQL) bias-level sensors are fabricated on an RQL integrated circuit (IC) to sample AC or DC bias values provided to operational RQL circuitry on the RQL IC. The bias-level sensors include pulse generators having strengthened or weakened bias taps (transformer couplings to RQL AC clock resonators or DC bias lines) as compared to bias taps of Josephson transmission lines in the operational RQL circuitry, or Josephson junctions (JJs) with larger or smaller critical currents as compared to JJs in the operational RQL circuitry. Pulse generators with weakened bias taps or larger JJs can have lower limits of their operational ranges placed near an optimal bias point at the centroid of the operating region of the operational RQL circuitry. The bias-level sensors can be staged by relative strength to indicate whether a provided bias value is an improvement when varied over a range.

The invention discloses a quantum state coding method of a polynomial function and a related device, and belongs to the technical field of quantum computing, and the method comprises the steps: determining the scale of a unitary matrix based on the highest order of the polynomial function, and constructing a target matrix based on a plurality of function values of the polynomial function; wherein the quantum logic gate corresponding to the unitary matrix is used for constructing a quantum circuit of a quantum state of a coding polynomial function, and the line number of the target matrix is the same as that of the unitary matrix; performing singular value decomposition on the target matrix to obtain a plurality of unitary matrixes; and determining a quantum logic gate corresponding to each unitary matrix, and acting each quantum logic gate on the corresponding quantum bit to obtain the quantum state of the polynomial function, thereby realizing coding from the classical data form to the quantum state of the polynomial function.

The invention discloses a quantum computer-oriented evolutionary quantum architecture search method, which comprises the following steps of: constructing a search space by adopting different quantum logic gates according to different image data sets; initializing the quantum gate combination candidate set in the search space, and generating a circuit structure feature code; evaluating the initialized quantum gate combination candidate set on the data set, and obtaining the fitness ranking of each quantum gate combination on the current image processing task; dynamically adjusting the elite proportion by using an adaptive binary bidding selection algorithm, preferentially retaining a high-potential and high-fitness framework, and filling a mating pool; an inheritable mutation algorithm is adopted, directional mutation is performed according to difference sites while information continuity of a parent structure is kept, convergence is accelerated, and population diversity is improved; under the condition that quantum bit resources are met, evolution iteration and parameter fine tuning are adopted for alternate optimization, and a self-adaptive double-threshold small-angle pruning method is designed to reduce the gate number and the circuit depth.

Systems and methods for quantum computing devices are provided. In one example, a method may include implementing, by a quantum computing system, a microwave pulse train in a microwave control signal for a qubit of a quantum computing system, the microwave pulse train having a plurality of microwave pulses. The method may include determining, by the quantum computing system, a Fourier parameter associated with the plurality of microwave pulses based at least in part on a Rabi oscillation of the qubit. The method may include modifying, by the quantum computing system, one or more control signals for the qubit of the quantum computing system based at least in part on the Fourier parameter.

Methods, systems and apparatus for estimating the fidelity of quantum logic gates. In one aspect, a method includes defining multiple sets of random quantum circuits; for each set of random quantum circuits: selecting an observable for each element in the set of random quantum circuits, wherein each selected observable corresponds to a respective element of the set of random quantum circuits and is dependent on the element to which it corresponds; estimating a value of a polarization parameter for the set of random quantum circuits, comprising performing a least mean squares minimization based on multiple expectation values, wherein each expectation value comprises an expectation value of a respective selected observable with respect to an output of an experimental implementation of a random quantum circuit corresponding to the respective selected observable; and processing the estimated polarization parameter values to obtain an estimate of the fidelity of the n-qubit quantum logic gate.

One example aspect of the present disclosure is directed to a method for implementing fault-tolerant quantum computing. The method includes receiving a set of inputs for a fault-tolerant quantum-computation circuit (QCC). The set of inputs includes an indication of a set of logical qubits and an indication of a set of quantum-logic stabilizers that the QCC is configured to perform on the set of logical qubits. A satisfiability modulo theory (SMT) model for the QCC is generated based on the set of inputs. The SMT model includes a set of constraints. A set of values to populate a data structure. The set of values satisfies the set of constraints of the SMT model. The data structure populated by the set of values encodes an intermediate representation (IR) of a time evolution of the QCC performing the set of quantum-logic stabilizers on the set of logical qubits.

A quantum logic spectroscopy system for an ion trap configured to trap a primary ion and a detection ion, the quantum logic spectroscopy system configured to apply one or more conditioning operations, each of the one or more conditioning operations comprising applying a mapping operation to map a primary ion state of the primary ion on to a detection ion state of the detection ion, applying a state change operation comprising changing the detection ion state if the detection ion state has a first detection state value, and determine a probability of the detection ion state changing in response to the application of the state change operation, and determine the primary ion state using the determined probability or determine that the primary ion state is indeterminate using the determined probability.

The invention discloses an amplitude preparation method of a quantum state and a related device, and belongs to the technical field of quantum computing, the method comprises the following steps: determining each partial component of a target quantum state to be prepared, each partial component comprising a ground state of the target quantum state and a probability amplitude of the ground state; a plurality of target matrixes are constructed based on the probability amplitudes of the partial components, singular value decomposition is carried out on the target matrixes to obtain unitary matrixes, and quantum logic gates corresponding to the unitary matrixes obtained through decomposition act together to evolve a target quantum state into 0gt; state; constructing inverse mapping of quantum logic gates corresponding to the unitary matrixes, and acting on the initial state 0gt; an amplitude preparation quantum circuit is obtained on the quantum bit of the state, and the amplitude preparation quantum circuit is used for generating the target quantum state. According to the scheme, the amplitude preparation quantum circuit is constructed based on the idea of deentanglement, and the amplitude preparation of the quantum state can be more efficiently carried out.

The embodiment of the invention provides a quantum state reading method, a quantum calculation measurement and control system and a storage medium. According to the scheme, the method comprises the following steps: obtaining quantum measurement and control information required by a target quantum bit to execute a target quantum logic gate operation; based on the first waveform parameter, obtaining a quantum state reading result of the target quantum bit at the current moment through a reading signal line, and taking the quantum state reading result as a first reading result; based on the second waveform parameter, triggering the target quantum bit to execute a target quantum logic gate operation through the bit signal line; based on the first waveform parameter, obtaining a quantum state reading result after the target quantum bit completes the target quantum logic gate operation through a reading signal line, and taking the quantum state reading result as a second reading result; and when the first reading result is the target quantum state, determining the second reading result as a target reading result corresponding to the target quantum logic gate operation. Through the technical scheme provided by the embodiment of the invention, the accuracy of a quantum state reading result is improved.

To provide a quantum logic gate operation device, a method and a program which have quick gate execution speed while holding heat insulation performance, and realize entanglement quantum gate operation being resistive to ZI interaction error, residual ZZ interaction error and phase relaxation error.SOLUTION: A quantum logic gate operation device comprises: a 2 quantum bit system of a control quantum bit 11 and a target quantum bit 12; a crossing resonance drive pulse irradiation unit which irradiates the control quantum bit with crossing resonance drive pulses of a natural frequency of the target quantum bit; an echo pulse irradiation unit which irradiates the control quantum bit with echo pulses which reverse a quantum state; and a control unit which emits the crossing resonance drive pulses of a first phase in a first period of quantum logic gate operation, continuously changes the phase while holding strength of the pulses in a second period, controls the crossing resonance drive pulse irradiation unit so as to emit the crossing resonance drive pulses of a second phase in a third period, and controls the echo pulse irradiation unit so as to irradiate the echo pulses in the second period.SELECTED DRAWING: Figure 5

In a first aspect, a method for suppressing rotating implementation errors in a multi-qubit quantum logic operation G. The method comprising applying at least one of a corresponding single-qubit prefix gate, before applying said quantum logic operation G; and, a corresponding single-qubit suffix gate, after applying said quantum logic operation G. Coefficients of Pauli terms, of any one of said prefix gate and said suffix gate, are based on an accumulated time from a beginning of a quantum circuit to the quantum logic operation G. In a second and aspect, a method for rotating dynamical-decoupling for pair-wise application of a quantum logic operation G. In further aspects, a characterization method for rotating implementation errors, and systems for implementation of the methods.

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.

The invention relates to quantum information technology demonstration, in particular to a single-bit quantum logic gate operation simulation demonstration method, which comprises the following steps: selecting a function mode, and entering a concept demonstration mode / analysis demonstration mode; after entering a concept demonstration mode, selecting an initial state of a quantum bit and a quantum logic gate, and after operation, performing spatial conversion on the position of the initial state in a Bloch sphere by using a Bloch sphere view angle of the quantum logic gate to obtain and display the position of a final state of the quantum bit in the Bloch sphere; after entering an analysis demonstration mode, selecting an initial state and a quantum logic gate of the quantum bit, obtaining a column vector of the initial state and a matrix of the quantum logic gate after operation, calculating a column vector of a final state of the quantum bit according to an analysis demonstration mode calculation kernel, and converting the column vector of the final state into a space coordinate of a corresponding Bloch sphere; column vector display and Bloch ball display of a final state are carried out; the technical scheme provided by the invention can effectively overcome the defect that learning requirements at different stages are difficult to consider in the prior art.

The embodiment of the invention provides a quantum state reading method, a quantum calculation measurement and control system and a storage medium. The method comprises the following steps: obtaining quantum measurement and control information; after the first time delay at the current moment, based on the first waveform parameter and the second time delay, triggering a first reading operation for the quantum state of the target quantum bit at the current moment through the reading signal line to obtain a first reading result; based on the second waveform parameter, triggering the target quantum bit to execute a target quantum logic gate operation through the bit signal line; based on the first waveform parameter and the second time delay, triggering a second reading operation of the quantum state after the target quantum bit completes the target quantum logic gate operation through the reading signal line, and obtaining a second reading result; and when the first reading result is the target quantum state, determining the second reading result as a target reading result corresponding to the target quantum logic gate operation. Through the technical scheme provided by the embodiment of the invention, the fidelity of quantum state reading is improved.

The application discloses a construction method of a rare earth ion system arbitrary non-adiabatic and anharmonic quantum logic gate, and relates to the technical field of quantum computing. The method comprises the following steps: firstly, designing a free degree-containing oblique cutting evolution path in a Bloch sphere; the free degree is a random path; secondly, converting the evolution path into amplitude and phase parameters of optical pulses required for controlling a three-energy-level system through reverse engineering; thirdly, generating a group of two-color optical pulses based on the amplitude and phase parameters by using an arbitrary wave generator and an acousto-optic modulator; and finally, controlling quantum states of optical field coupling by using the two-color optical pulses to construct the non-adiabatic and anharmonic quantum logic gate. The constructed logic gate shows strong robustness to frequency mismatch (non-uniform broadening) inherent in the ensemble system and optical intensity distribution error in experiments, and the accuracy and stability of quantum control in an actual noise environment are significantly improved.

In a first aspect, a method for suppressing rotating implementation errors in a multi-qubit quantum logic operation G. The method comprising applying at least one of: a corresponding single-qubit prefix gate, before applying said quantum logic operation G; and, a corresponding single-qubit suffix gate, after applying said quantum logic operation G. Coefficients of Pauli terms, of any one of said prefix gate and said suffix gate, are based on an accumulated time from a beginning of a quantum circuit to the quantum logic operation G. In a second and aspect, a method for rotating dynamical-decoupling for pair-wise application of a quantum logic operation G. In further aspects, a characterization method for rotating implementation errors, and systems for implementation of the methods.

Methods, systems and apparatus for estimating the fidelity of quantum logic gates. In one aspect, a method includes defining multiple sets of random quantum circuits; for each set of random quantum circuits: selecting an observable for each element in the set of random quantum circuits, wherein each selected observable corresponds to a respective element of the set of random quantum circuits and is dependent on the element to which it corresponds; estimating a value of a polarization parameter for the set of random quantum circuits, comprising performing a least mean squares minimization based on multiple expectation values, wherein each expectation value comprises an expectation value of a respective selected observable with respect to an output of an experimental implementation of a random quantum circuit corresponding to the respective selected observable; and processing the estimated polarization parameter values to obtain an estimate of the fidelity of the n-qubit quantum logic gate.

Abstract: The invention relates to a technical interface for the targeted manipulation and reprogramming, regulation, control, influencing, and measurement of subatomic, atomic, and molecular processes and states. It is based on quantum logic methods, in particular the controlled entanglement and control of quark-gluon exchange (QGA) in the atomic nucleus—which, within the scope of this invention, is considered a natural quantum computer. At its core is the so-called "atomic code," a structured control protocol that specifically addresses and modulates the quantum mechanical parameters of an atom—such as color charge, spin, and coupling strength—(similar to DNA in the cell nucleus). The device works with quantum entangled and / or quantum logic states between control qubits (or qutrits) and target atoms / molecules, and through this modulation enables a targeted change of chemical and physical properties. This allows, among other things: • the precise reprogramming of matter at the quantum level, • The transformation of elements, • the development of synthetic and hybrid atoms or molecules, • and far-reaching applications in fields such as medicine, materials science, quantum computing, AI / AGI and biotechnology. The invention provides a technical basis for the operational control of matter based on the QGA and the atomic code - and establishes a completely new class of technology with the potential to open up an independent patent and innovation field.

The application discloses a method and device for determining a target system Hamiltonian, which comprises the following steps: firstly, determining a first Hamiltonian H of the target system, constructing a multi-bit quantum logic gate U, and generating a second Hamiltonian H' according to the first Hamiltonian H, wherein the second Hamiltonian H' satisfies the multi-bit quantum logic gate U, wherein j represents the number of quantum bits, X q(j) represents an operation operator acting on the jth quantum bit, τ j represents a Hamiltonian reduced in the conversion process from the first Hamiltonian to the second Hamiltonian, which can realize the representation of the Hamiltonian of the target system to be simulated by using a smaller number of quantum bits, thereby providing support for the calculation of the energy of the target system through quantum chemical simulation.

The application discloses a preparation method and device of a quantum state, and the method comprises the following steps: obtaining specific elements in target data, position information corresponding to the specific elements and a group of quantum bits; for each specific element and the position information corresponding to the specific element, a specified quantum logic gate is used to perform an evolution operation of a quantum state, so that the position information corresponding to the specific element is encoded on the quantum bits; and a final quantum state containing the encoded quantum bits is output, wherein the amplitude value of the final quantum state is in one-to-one correspondence with the element value of the specific element in the target data. According to the embodiment of the application, the target data information can be encoded into the quantum state by using the specified quantum logic gate, and the quantum state can be used for simulation of quantum calculation.