CN115470923A - Method and device for acquiring DC spectrum of adjustable coupler and quantum computer - Google Patents
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Abstract
The invention discloses a method and a device for acquiring a DC spectrum of an adjustable coupler and a quantum computer, wherein a first experiment is firstly executed on the adjustable coupler and a first qubit, the first experiment is used for acquiring the change condition of a first amplitude of the first qubit along with DC voltage and the frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first qubit, the DC voltage is the direct current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting the quantum state of the first qubit; a DC spectrum of the adjustable coupler is then obtained based on the change condition. Based on the scheme of the application, the DC spectrum of the adjustable coupler can be indirectly obtained through the cooperation of the quantum bit coupled with the adjustable coupler, so that the test representation of the performance parameters of the quantum chip is completed, and the technical blank is made up.
Description
Technical Field
The invention relates to the technical field of quantum computing, in particular to a method and a device for acquiring a DC spectrum of an adjustable coupler and a quantum computer.
Background
Quantum computation and quantum information are a cross discipline for realizing computation and information processing tasks based on the principle of quantum mechanics, and are closely related to disciplines such as quantum physics, computer discipline, informatics and the like. There has been rapid development in the last two decades. Quantum computer-based quantum algorithms for scenarios such as factorization, unstructured search, etc., exhibit performance far exceeding existing classical computer-based algorithms, and this direction is also being placed on expectations beyond existing computing capabilities. Since quantum computing has a potential for solving a specific problem far beyond the performance of a classical computer, in order to realize a quantum computer, a quantum chip containing a sufficient number of qubits and a sufficient quality of qubits is required, and extremely high-fidelity operation and reading of a quantum logic gate can be performed on the qubits. A quantum computer, which is a quantum chip, is equivalent to a CPU and a conventional computer, and a quantum chip is a core component of a quantum computer, and a quantum chip is a processor for performing quantum computation. Before each quantum chip is formally used online, all relevant parameters of quantum bits in the quantum chip need to be tested and represented.
In a qubit extension architecture based on an adjustable coupler, two qubits can be coupled through a fixed capacitive coupling and an adjustable coupler capable of adjusting a coupling coefficient, the adjustable coupler is similar to the qubit in structure, but because the adjustable coupler does not have a resonant cavity capable of directly reading information, the frequency of the adjustable coupler cannot be directly acquired when performance parameters of a quantum chip are tested and characterized, and further a DC spectrum or an AC spectrum of the adjustable coupler cannot be acquired.
Therefore, how to test and characterize the tunable coupler becomes an urgent problem to be solved in the field.
It is noted that the information disclosed in this background section of the application is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a method and a device for acquiring a DC spectrum of an adjustable coupler and a quantum computer, which are used for solving the problem that the adjustable coupler cannot be tested and characterized in the prior art.
In order to solve the above technical problem, the present invention provides a method for obtaining a DC spectrum of an adjustable coupler, including:
performing a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation condition of a first amplitude of the first qubit along with a DC voltage and a frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a reading cavity of the first qubit, the DC voltage is a direct-current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting a quantum state of the first qubit;
and acquiring the DC spectrum of the adjustable coupler based on the change condition.
Optionally, the performing a first experiment on the adjustable coupler and the first qubit includes:
configuring the traversal range of the DC voltage as a first range;
configuring the traversal range of the frequency of the control signal as a second range;
traversing the DC voltage over the first range and traversing a frequency of the control signal applied to the first qubit over the second range each time the DC voltage is traversed;
and acquiring the variation condition of the first amplitude of the first qubit along with the DC voltage and the frequency of a control signal.
Optionally, the DC voltage is traversed by a first step size within the first range, wherein the first step size is preconfigured.
Optionally, the frequency of the control signal is traversed according to a second step size within the second range, where the second step size is preconfigured.
Optionally, the obtaining a DC spectrum of the adjustable coupler based on the variation includes:
acquiring coordinate information of a plurality of points at the energy level splitting position based on the change condition, wherein the coordinate information comprises the value of the DC voltage and the value of the frequency of the corresponding control signal;
and acquiring the DC spectrum of the adjustable coupler based on the coordinate information.
Optionally, the obtaining the DC spectrum of the adjustable coupler based on the coordinate information includes:
and fitting the data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
Optionally, fitting processing is performed on the data included in the coordinate information according to the following fitting function:
wherein x is the DC voltage, y is the frequency of the control signal, and a, B, d, m, δ are parameters of the fitting function.
Based on the same inventive concept, the invention also provides an apparatus for obtaining a DC spectrum of an adjustable coupler, comprising:
a first experiment execution unit configured to execute a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation of a first amplitude of the first qubit with a DC voltage and a frequency of a control signal, the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the DC voltage is a DC operating voltage of the adjustable coupler, and the control signal is a signal for adjusting a quantum state of the first qubit;
a spectrum acquisition unit configured to acquire a DC spectrum of the adjustable coupler based on the variation.
Based on the same inventive concept, the invention also provides an acquisition method of the adjustable coupler AC spectrum, which comprises the following steps:
performing a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation condition of a first amplitude of the first qubit along with an AC voltage and a frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the AC voltage is a direct-current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting a quantum state of the first qubit;
and acquiring an AC spectrum of the adjustable coupler based on the change condition.
Based on the same inventive concept, the invention also provides an apparatus for obtaining an AC spectrum of an adjustable coupler, comprising:
a first experiment execution unit configured to execute a first experiment on an adjustable coupler and a first qubit, the first experiment being used to obtain a variation of a first amplitude of the first qubit with an AC voltage and a frequency of a control signal, wherein the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the AC voltage is a dc operating voltage of the adjustable coupler, and the control signal is a signal used to adjust a quantum state of the first qubit;
a spectrum acquisition unit configured to acquire an AC spectrum of the adjustable coupler based on the variation.
Based on the same inventive concept, the invention further provides a quantum control system, which utilizes the method for acquiring the DC spectrum of the adjustable coupler described in any one of the above characteristic descriptions, or utilizes the method for acquiring the AC spectrum of the adjustable coupler described in the above characteristic descriptions, or comprises the apparatus for acquiring the DC spectrum of the adjustable coupler described in the above characteristic descriptions, or comprises the apparatus for acquiring the AC spectrum of the adjustable coupler described in the above characteristic descriptions.
Based on the same inventive concept, the invention also provides a quantum computer, which comprises the quantum control system described in the characteristic description.
Based on the same inventive concept, the present invention further proposes a readable storage medium, on which a computer program is stored, which, when being executed by a processor, is capable of implementing the method for acquiring a DC spectrum of an adjustable coupler according to any one of the above-mentioned features, or of implementing the method for acquiring an AC spectrum of an adjustable coupler according to the above-mentioned features.
Compared with the prior art, the invention has the following beneficial effects:
the method for acquiring the DC spectrum of the adjustable coupler comprises the steps of firstly, executing a first experiment on the adjustable coupler and a first qubit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first qubit along with the DC voltage and the frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first qubit, the DC voltage is the direct current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting the quantum state of the first qubit; a DC spectrum of the adjustable coupler is then obtained based on the change condition. Based on the scheme of the application, the DC spectrum of the adjustable coupler can be indirectly acquired through the cooperation of the quantum bit coupled with the adjustable coupler, so that the test representation of the performance parameters of the quantum chip is completed, and the technical blank is made up.
The invention also provides an acquisition device of the DC spectrum of the adjustable coupler, an acquisition method of the AC spectrum of the adjustable coupler, an acquisition device of the AC spectrum of the adjustable coupler, a quantum control system, a quantum computer and a readable storage medium.
Drawings
Fig. 1 is a schematic flowchart of a method for acquiring a DC spectrum of an adjustable coupler according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the result of performing the first experiment on the tunable coupler and the first qubit in an embodiment 1;
FIG. 3 is a diagram illustrating the results obtained after performing the first experiment on the tunable coupler and the first qubit in an embodiment 2;
FIG. 4 is a schematic diagram of a DC spectrum obtained after fitting the first experimental result;
fig. 5 is a schematic structural diagram of an apparatus for obtaining a DC spectrum of an adjustable coupler according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a method for obtaining an AC spectrum of an adjustable coupler according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an apparatus for acquiring an AC spectrum of an adjustable coupler according to an embodiment of the present invention.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is provided for the purpose of facilitating and clearly illustrating embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Referring to fig. 1, an embodiment of the present application provides a method for obtaining a DC spectrum of an adjustable coupler, including:
s10: performing a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation situation of a first amplitude of the first qubit along with a DC voltage and a frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the DC voltage is a direct-current working voltage of the adjustable coupler, and the control signal is a signal for adjusting a quantum state of the first qubit;
s20: and acquiring the DC spectrum of the adjustable coupler based on the change condition.
The method for obtaining the DC spectrum of the adjustable coupler provided in the embodiment of the present invention is different from the prior art, and includes first performing a first experiment on the adjustable coupler and a first qubit, where the first experiment is used to obtain a change condition of a first amplitude of the first qubit along with a DC voltage and a frequency of a control signal, where the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the DC voltage is a DC operating voltage of the adjustable coupler, and the control signal is a signal used to adjust a quantum state of the first qubit; a DC spectrum of the adjustable coupler is then obtained based on the change condition. Based on the scheme of the application, the DC spectrum of the adjustable coupler can be indirectly obtained through the cooperation of the quantum bit coupled with the adjustable coupler, so that the test representation of the performance parameters of the quantum chip is completed, and the technical blank is made up.
The experimental result of the first experiment may refer to fig. 2 and 3, where fig. 2 and 3 are results obtained after performing the first experiment on the adjustable coupler and the first qubit in an embodiment, and fig. 2 and 3 are three-dimensional graphs, where an abscissa is the DC voltage, an ordinate is the frequency of the control signal, and a change in color represents a different amplitude change.
A qubit and a tunable coupler can form a three-level system comprising three basis vectors |00>、|01>And |10>Wherein, | α β>Represents a qubit occupation of|α>And the adjustable coupler occupancy is | β>. In the three-level system, loading a qubit with one cycle drive can convert |00>And |10>Are coupled together. In addition, |01>And |10>The coupling strength between is g. The frequencies of the three energy levels are respectively omega 00 ＝0、ω 10 And ω 01 . Where ω is 10 ＝f 10 ，ω 01 ＝f 01 Wherein, f 10 Frequency of qubits, f 01 Is the frequency of the adjustable coupler.
The Hamilton formed by |10> and |01> subspaces is:
the two eigenstates of the three-level system are respectively:
the corresponding two eigenvalues are:
wherein Δ = ω 01 -ω 10 At |01>And |10>In the case of equal energy, at this time
When ω = ω 10 The three-level system cannot be controlled from |00>Excitation to |10>And when ω = E +(-) ＝ω 10 When +/-g, the three-level system mayFrom |00>Are respectively excited to | +>(|+>) (ii) a At |01>And |10>In the case of far off-resonance of energy between, say, Δ > 0, then | φ> ± ≈|10>(|01>) Then may pass ω = ω 10 -g 2 Δ will the three energy level system from |00>Excitation to |10>。
Based on the above description, the applicant further studied and found that when a qubit is not resonant with the frequency of the tunable coupler, we can only have one excitation frequency to excite the qubit if the qubit is excited, and the essential reason is that we cannot observe the energy level splitting phenomenon in the experimental results of the first experiment because only one of the eigenstates includes a larger |10>. When the frequency of the qubit is equal to that of the tunable coupler, that is, when resonance occurs, the qubit is excited at the moment, and bit excitation can be realized at different frequencies, so that an energy level splitting phenomenon can be observed in an experimental result of a first experiment, and the essence is that two eigenstates both contain larger |10>. The area in the dashed box in fig. 2 and fig. 3 is the area where energy level splitting occurs, and at several points in this area, the qubit is equal to the frequency of the adjustable coupler, and by using this principle we can indirectly obtain the frequency of the adjustable coupler and the corresponding DC voltage.
In this embodiment, the performing a first experiment on the tunable coupler and the first qubit includes:
configuring the traversal range of the DC voltage as a first range;
configuring the traversal range of the frequency of the control signal as a second range;
traversing the DC voltage over the first range and traversing a frequency of the control signal applied to the first qubit over the second range each time the DC voltage is traversed;
and acquiring the variation condition of the first amplitude of the first qubit along with the DC voltage and the frequency of a control signal.
Specifically, in this embodiment, the DC voltage is traversed by a first step size within the first range, where the first step size is preconfigured. In addition, the frequency of the control signal is traversed according to a second step size in the second range, wherein the second step size is configured in advance.
Specifically, in this embodiment of the present application, the obtaining a DC spectrum of the adjustable coupler based on the variation includes:
acquiring coordinate information of a plurality of points at the energy level splitting position based on the change condition, wherein the coordinate information comprises the value of the DC voltage and the corresponding value of the frequency of the control signal;
acquiring a DC spectrum of the adjustable coupler based on the coordinate information.
Referring to fig. 2 to 4, several coordinates in the area a and the area B of fig. 4 are obtained from the energy level splitting positions of fig. 2 and 3. After acquiring the coordinates, further, the acquiring a DC spectrum of the adjustable coupler based on the coordinate information includes:
and fitting the data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
In this embodiment, after acquiring a plurality of pieces of coordinate information from the energy level splitting positions in fig. 2 and fig. 3, fitting the coordinate information may be performed to fit a curve of the entire DC spectrum, which may specifically refer to fig. 4.
Further, in order to fit the DC spectrum of the adjustable coupler more accurately, the applicant proposes to fit the coordinate information by a fitting function, specifically, to fit the data contained in the coordinate information according to the following fitting function:
wherein x is the DC voltage, y is the frequency of the control signal, and a, B, d, m, δ are parameters of the fitting function.
Based on the same inventive concept, please refer to fig. 5, an embodiment of the present application further provides an apparatus for obtaining a DC spectrum of an adjustable coupler, including:
a first experiment execution unit 10 configured to execute a first experiment on an adjustable coupler and a first qubit, where the first experiment is used to obtain a variation of a first amplitude of the first qubit with a DC voltage and a frequency of a control signal, where the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the DC voltage is a DC operating voltage of the adjustable coupler, and the control signal is a signal used to adjust a quantum state of the first qubit;
a spectrum acquisition unit 20 configured to acquire a DC spectrum of the adjustable coupler based on the variation.
It is understood that the first experiment executing unit 10 and the spectrum acquiring unit 20 may be combined in one device, or any one of the modules may be divided into a plurality of sub-modules, or at least part of the functions of one or more of the modules in the first experiment executing unit 10 and the spectrum acquiring unit 20 may be combined with at least part of the functions of other modules and implemented in one functional module. According to an embodiment of the present invention, at least one of the first experiment execution unit 10 and the spectrum acquisition unit 20 may be implemented at least partially as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or may be implemented in hardware or firmware in any other reasonable manner of integrating or packaging a circuit, or in a suitable combination of three implementations of software, hardware, and firmware. Alternatively, at least one of the first experiment performing unit 10 and the spectrum obtaining unit 20 may be at least partially implemented as a computer program module, which, when executed by a computer, may perform the functions of the respective module.
Based on the same inventive concept, please refer to fig. 6, an embodiment of the present application further provides a method for obtaining an AC spectrum of an adjustable coupler, including:
s100: performing a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation condition of a first amplitude of the first qubit along with an AC voltage and a frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the AC voltage is a direct-current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting a quantum state of the first qubit;
s200: and acquiring an AC spectrum of the adjustable coupler based on the change condition.
Based on the same inventive concept, referring to fig. 7, an apparatus for obtaining an AC spectrum of an adjustable coupler is further provided in the embodiment of the present application, including:
a first experiment execution unit 100 configured to execute a first experiment on an adjustable coupler and a first qubit, the first experiment being used to obtain a variation of a first amplitude of the first qubit with an AC voltage and a frequency of a control signal, wherein the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the AC voltage is a dc operating voltage of the adjustable coupler, and the control signal is a signal used to adjust a quantum state of the first qubit;
a spectrum acquisition unit 200 configured to acquire an AC spectrum of the adjustable coupler based on the variation.
It is understood that the first experiment execution unit 100 and the spectrum acquisition unit 200 may be combined and implemented in one device, or any one of the modules may be split into a plurality of sub-modules, or at least part of the functions of one or more of the modules in the first experiment execution unit 100 and the spectrum acquisition unit 200 may be combined with at least part of the functions of other modules and implemented in one functional module. According to an embodiment of the present invention, at least one of the first experiment performing unit 100 and the spectrum obtaining unit 200 may be at least partially implemented as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or may be implemented in hardware or firmware in any other reasonable manner of integrating or packaging a circuit, or in a suitable combination of three implementations of software, hardware, and firmware. Alternatively, at least one of the first experiment performing unit 100 and the spectrum acquiring unit 200 may be at least partially implemented as a computer program module, which, when executed by a computer, may perform the functions of the respective modules.
Based on the same inventive concept, an embodiment of the present application further provides a quantum control system, which utilizes the method for obtaining a DC spectrum of the adjustable coupler described in any of the above feature descriptions, or utilizes the method for obtaining an AC spectrum of the adjustable coupler described in the above feature descriptions, or includes the device for obtaining a DC spectrum of the adjustable coupler described in the above feature descriptions, or includes the device for obtaining an AC spectrum of the adjustable coupler described in the above feature descriptions.
Based on the same inventive concept, the embodiment of the present application further provides a quantum computer, which includes the quantum control system described in the above feature description.
Based on the same inventive concept, the present application further provides a readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, can implement the method for acquiring a DC spectrum of an adjustable coupler described in any one of the above features, or implement the method for acquiring an AC spectrum of an adjustable coupler described in the above features.
The readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device, such as, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as a punch card or an in-groove protruding structure with instructions stored thereon, and any suitable combination of the foregoing. The computer programs described herein may be downloaded from a readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives the computer program from the network and forwards the computer program for storage in a readable storage medium in the respective computing/processing device. Computer programs for carrying out operations of the present invention may be assembler instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer program may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), can execute computer-readable program instructions to implement various aspects of the present invention by utilizing state information of a computer program to personalize the electronic circuitry.
Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, systems and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer programs. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the programs, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a computer program may also be stored in a readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the readable storage medium storing the computer program comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the computer program which executes on the computer, other programmable apparatus or other devices implements the functions/acts specified in the flowchart and/or block diagram block or blocks.
In the description herein, references to the description of "one embodiment," "some embodiments," "an example" or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. Any person skilled in the art can make any equivalent substitutions or modifications on the technical solutions and technical contents disclosed in the present invention without departing from the scope of the technical solutions of the present invention, and still fall within the protection scope of the present invention without departing from the technical solutions of the present invention.
Claims (13)
1. A method for obtaining a DC spectrum of an adjustable coupler is characterized by comprising the following steps:
performing a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation condition of a first amplitude of the first qubit along with a DC voltage and a frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a reading cavity of the first qubit, the DC voltage is a direct-current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting a quantum state of the first qubit;
and acquiring the DC spectrum of the adjustable coupler based on the change condition.
2. The method of claim 1, wherein performing a first experiment on the adjustable coupler and the first qubit comprises:
configuring the traversal range of the DC voltage as a first range;
configuring the traversal range of the frequency of the control signal as a second range;
traversing the DC voltage over the first range and traversing a frequency of the control signal applied to the first qubit over the second range each time the DC voltage is traversed;
and acquiring the variation condition of the first amplitude of the first qubit along with the DC voltage and the frequency of a control signal.
3. The method of claim 2, wherein the DC voltage is traversed by a first step size within the first range, wherein the first step size is preconfigured.
4. The method of claim 2, wherein the frequency of the control signal is traversed by a second step size within the second range, wherein the second step size is preconfigured.
5. The method of claim 1, wherein said obtaining a DC spectrum of the adjustable coupler based on the change condition comprises:
acquiring coordinate information of a plurality of points at the energy level splitting position based on the change condition, wherein the coordinate information comprises the value of the DC voltage and the value of the frequency of the corresponding control signal;
acquiring a DC spectrum of the adjustable coupler based on the coordinate information.
6. The method of claim 5, wherein said obtaining a DC spectrum of the adjustable coupler based on the coordinate information comprises:
and fitting data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
7. The method of claim 6, wherein the fitting process is performed on the data contained in the coordinate information according to the following fitting function:
wherein x is the DC voltage, y is the frequency of the control signal, and a, B, d, m, δ are parameters of the fitting function.
8. An apparatus for obtaining a DC spectrum of a tunable coupler, comprising:
a first experiment execution unit configured to execute a first experiment on an adjustable coupler and a first qubit, the first experiment being used to obtain a variation of a first amplitude of the first qubit with a DC voltage and a frequency of a control signal, wherein the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the DC voltage is a DC operating voltage of the adjustable coupler, and the control signal is a signal used to adjust a quantum state of the first qubit;
a spectrum acquisition unit configured to acquire a DC spectrum of the adjustable coupler based on the variation.
9. A method for obtaining an AC spectrum of a tunable coupler, comprising:
performing a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation condition of a first amplitude of the first qubit along with an AC voltage and a frequency of a control signal, the adjustable coupler is coupled with the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the AC voltage is a direct-current working voltage of the adjustable coupler, and the control signal is a signal used for adjusting a quantum state of the first qubit;
and acquiring an AC spectrum of the adjustable coupler based on the change condition.
10. An apparatus for obtaining an AC spectrum of a tunable coupler, comprising:
a first experiment execution unit configured to execute a first experiment on an adjustable coupler and a first qubit, wherein the first experiment is used for acquiring a variation of a first amplitude of the first qubit with an AC voltage and a frequency of a control signal, the adjustable coupler is coupled to the first qubit, the first amplitude is an amplitude of a first signal carrying quantum state information in a read cavity of the first qubit, the AC voltage is a dc operating voltage of the adjustable coupler, and the control signal is a signal for adjusting a quantum state of the first qubit;
a spectrum acquisition unit configured to acquire an AC spectrum of the adjustable coupler based on the variation.
11. A quantum control system, characterized by using the method of acquiring an adjustable coupler DC spectrum according to any one of claims 1 to 7, or using the method of acquiring an adjustable coupler AC spectrum according to claim 9, or comprising the apparatus of acquiring an adjustable coupler DC spectrum according to claim 8, or comprising the apparatus of acquiring an adjustable coupler AC spectrum according to claim 10.
12. A quantum computer comprising the quantum control system of claim 11.
13. A readable storage medium, on which a computer program is stored, which, when being executed by a processor, is able to carry out the method for acquiring a DC-spectrum of an adjustable coupler according to any one of claims 1 to 7 or the method for acquiring an AC-spectrum of an adjustable coupler according to claim 9.
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| CN202211007594.XA CN115470923B (en) | 2022-08-22 | 2022-08-22 | Method and device for acquiring DC spectrum of adjustable coupler and quantum computer |
| PCT/CN2023/111508 WO2024041361A1 (en) | 2022-08-22 | 2023-08-07 | Test characterization method and apparatus for adjustable coupler of quantum chip, and quantum computer |
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| WO2024041361A1 (en) * | 2022-08-22 | 2024-02-29 | 本源量子计算科技（合肥）股份有限公司 | Test characterization method and apparatus for adjustable coupler of quantum chip, and quantum computer |
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