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CN-118228834-B - Quantum chip resource allocation method and device and quantum computer

CN118228834BCN 118228834 BCN118228834 BCN 118228834BCN-118228834-B

Abstract

The application discloses a method and a device for distributing quantum chip resources and a quantum computer, firstly obtaining the physical topological structure of a quantum chip, and constructing a constraint model of the working point of the tunable coupler, wherein the constraint model is used for limiting the coupling strength between the tunable coupler and the adjacent qubit. And finally, distributing the working point of each adjustable coupler in the quantum chip by utilizing the physical topological structure and the constraint model. According to the quantum chip resource allocation method provided by the application, the constraint model of the working point of the adjustable coupler is constructed, and the requirements of a large-scale quantum chip can be met by considering the whole chip, so that the blank of the prior art is filled up.

Inventors

  • Request for anonymity
  • Request for anonymity
  • KONG WEICHENG

Assignees

  • 本源量子计算科技（合肥）股份有限公司

Dates

Publication Date
20260512
Application Date
20221213

Claims (9)

  1. 1. The method for allocating the quantum chip resources is characterized by comprising the following steps of: Acquiring a physical topological structure of the quantum chip, wherein the physical topological structure is used for reflecting the physical layout of each device in the quantum chip; Constructing a constraint model of an operating point of an adjustable coupler, wherein the constraint model is used for limiting the coupling strength between the adjustable coupler and adjacent quantum bits, and the operating point of the adjustable coupler is the frequency of the adjustable coupler; distributing the working point of each adjustable coupler in the quantum chip by utilizing the physical topological structure and the constraint model; When the number of qubits coupled to the tunable coupler is two, the constraint model includes: ; The constraint model is used for obtaining the minimum value of func coupler , g ic 、g jc is the coupling strength between two qubits of the adjustable coupler, which are respectively coupled with the adjustable coupler, f c is the frequency of the adjustable coupler, f i 、f j is the frequency of two qubits of the adjustable coupler, and g ij is the coupling strength between two qubits of the adjustable coupler.
  2. 2. The allocation method of claim 1, wherein the constraint model further comprises: 。
  3. 3. the allocation method according to claim 1, wherein the allocation method further comprises: And based on the physical topological structure, sequentially acquiring the working points of each quantum bit in the quantum chip, wherein the working points of the quantum bits are the frequency of the quantum bits.
  4. 4. A distribution method according to claim 3, characterized in that the operating points of the individual qubits in the quantum chip are substituted into the constraint model to obtain the operating point of each tunable coupler.
  5. 5. The allocation method according to claim 1, wherein the allocation method further comprises: Setting the frequency adjusting range of the adjustable coupler in the quantum chip.
  6. 6. A quantum chip resource allocation apparatus, comprising: a physical topology acquisition unit configured to acquire a physical topology of the quantum chip, the physical topology being used to reflect a physical layout of each device in the quantum chip; A constraint model construction unit configured to construct a constraint model of an operating point of an adjustable coupler, the constraint model being used to limit a magnitude of a coupling strength between the adjustable coupler and an adjacent qubit, the operating point of the adjustable coupler being a frequency of the adjustable coupler; an allocation unit configured to allocate an operating point of each tunable coupler in the quantum chip using the physical topology and the constraint model; When the number of qubits coupled to the tunable coupler is two, the constraint model includes: ; The constraint model is used for obtaining the minimum value of func coupler , g ic 、g jc is the coupling strength between two qubits of the adjustable coupler, which are respectively coupled with the adjustable coupler, f c is the frequency of the adjustable coupler, f i 、f j is the frequency of two qubits of the adjustable coupler, and g ij is the coupling strength between two qubits of the adjustable coupler.
  7. 7. A quantum control system, characterized by using the method for allocating quantum chip resources according to any one of claims 1 to 5, or comprising the apparatus for allocating quantum chip resources according to claim 6.
  8. 8. A quantum computer comprising the quantum control system of claim 7.
  9. 9. A readable storage medium having stored thereon a computer program, which when executed by a processor is capable of implementing the quantum chip resource allocation method of any one of claims 1 to 5.

Description

Quantum chip resource allocation method and device and quantum computer Technical Field The present invention relates to the field of quantum computing technologies, and in particular, to a method and an apparatus for allocating quantum chip resources, and a quantum computer. Background Quantum computation and quantum information are a cross subject for realizing computation and information processing tasks based on the principle of quantum mechanics, and have very close connection with subjects such as quantum physics, computer science, informatics and the like. There has been a rapid development in the last two decades. Quantum computer-based quantum algorithms in factorization, unstructured search, etc. scenarios exhibit far beyond the performance of existing classical computer-based algorithms, and this direction is expected to be beyond the existing computing power. Since quantum computing has a potential to solve specific problems far beyond the development of classical computer performance, in order to realize a quantum computer, it is necessary to obtain a quantum chip containing a sufficient number and a sufficient mass of qubits, and to enable quantum logic gate operation and reading of the qubits with extremely high fidelity. The quantum chip is the core component of the quantum computer, and the quantum chip is the processor for executing quantum computation. Before each quantum chip is formally used on line, each parameter of the quantum bit in the quantum chip needs to be tested and characterized. For each qubit in a quantum chip, it is desirable to implement as fast a qubit logic gate as possible in order to be able to perform as many computations as possible within the finite lifetime of the qubit. In general, the execution completion time of a qubit logic gate is typically three to four orders of magnitude faster than the qubit lifetime. However, fast qubit logic gate operations may cause the qubit logic gate to malfunction when executed. There are many reasons for the error of the qubit logic gate, such as parasitic coupling between nearest neighbor and next neighbor qubits, spectral diffusion two-stage system (TLS) defects, parasitic microwave modes, coupling to control lines and readout resonators, frequency control electronics noise, frequency control pulse distortion, microwave control pulse distortion, and microwave carrier leakage, etc. When each quantum bit in the quantum chip is at a proper working point, the interference influence can be effectively reduced. In a quantum chip structure based on an adjustable coupler, two quantum bits can be coupled through a fixed capacitive coupling and an adjustable coupler capable of adjusting a coupling coefficient, and the adjustable coupler is similar to the quantum bit in structure, except that the adjustable coupler does not have a quantum state control line and a resonant cavity capable of directly reading information. Currently, in order to improve the accuracy of quantum chip for performing quantum computing tasks, the problem of working points of a few quantum bits is generally considered, and a scheme which is considered from the whole of the quantum chip is lacking, and the existing scheme is feasible when the number of quantum bits in the quantum chip is small, for example, only a few quantum bits or tens of quantum bits, but in the foreseeable future, the number of quantum chips is necessarily greatly increased, and at that time, the existing scheme cannot meet the requirement of a large-scale quantum chip, and in addition, a scheme capable of distributing the working points of an adjustable coupler in the quantum chip is lacking in the prior art. Therefore, it is necessary to propose a quantum chip resource allocation scheme that can be considered from the whole of the quantum chip. It should be noted that the information disclosed in the background section of the present application is only for enhancement of understanding of the general background of the present application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to those skilled in the art. Disclosure of Invention The invention aims to provide a quantum chip resource allocation method and device and a quantum computer, which are used for solving the problem that a working point scheme capable of allocating an adjustable coupler in a quantum chip is lacking in the prior art. In order to solve the above technical problems, the present application provides a method for allocating quantum chip resources, including: Acquiring a physical topological structure of the quantum chip, wherein the physical topological structure is used for reflecting the physical layout of each device in the quantum chip; Constructing a constraint model of an operating point of an adjustable coupler, wherein the constraint model is used for limiting the coupling strength between the adjustable coupler and adjacent qubits; and