CN115470923B - Method and device for acquiring DC spectrum of adjustable coupler and quantum computer - Google Patents
Method and device for acquiring DC spectrum of adjustable coupler and quantum computer Download PDFInfo
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Abstract
The invention discloses a method, a device and a quantum computer for acquiring a DC spectrum of an adjustable coupler, which are characterized in that a first experiment is firstly carried out on the adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit; a DC spectrum of the tunable coupler is then obtained based on the variation. Based on the scheme of the application, the DC spectrum of the adjustable coupler can be indirectly obtained through the matching of the quantum bit coupled with the adjustable coupler, so that the test characterization 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 an acquisition method and device of an adjustable coupler DC spectrum 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, all relevant parameters of quantum bits in the quantum chip need to be tested and characterized.
In a quantum bit expansion architecture 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 structure of the quantum bits, 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 obtained when the performance parameters of a quantum chip are tested and characterized, and therefore the DC spectrum or the AC spectrum of the adjustable coupler cannot be obtained.
Therefore, how to test and characterize an adjustable coupler is a problem to be solved in the art.
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 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 technical problems, the invention provides a method for acquiring a DC spectrum of an adjustable coupler, which comprises the following steps:
executing a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
and acquiring a DC spectrum of the adjustable coupler based on the change condition.
Optionally, the performing a first experiment on the tunable coupler and the first qubit includes:
configuring a traversal range of the DC voltage to be a first range;
configuring a traversal range of the frequency of the control signal as a second range;
traversing the DC voltage over the first range and traversing the frequency of the control signal applied to the first qubit over the second range each time the DC voltage is traversed;
the first amplitude of the first qubit is obtained along with the change condition of the DC voltage and the frequency of a control signal.
Optionally, traversing the DC voltage in a first step within the first range, wherein the first step is preconfigured.
Optionally, traversing the frequency of the control signal according to a second step in the second range, wherein the second step is preconfigured.
Optionally, the acquiring the DC spectrum of the tunable coupler based on the variation condition includes:
acquiring coordinate information of a plurality of points at an 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 a DC spectrum of the adjustable coupler based on the coordinate information.
Optionally, the acquiring the DC spectrum of the tunable coupler based on the coordinate information includes:
and carrying out fitting processing on the data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
Optionally, fitting the data contained in the coordinate information according to the following fitting function:
where x is the DC voltage, y is the frequency of the control signal, A, B, d, m, δ are parameters of the fitting function.
Based on the same inventive concept, the invention also provides an acquisition device of the DC spectrum of the adjustable coupler, which comprises:
the first experiment execution unit is configured to execute a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is coupled with the first quantum bit, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
a spectrum acquisition unit configured to acquire a DC spectrum of the tunable coupler based on the variation condition.
Based on the same inventive concept, the invention also provides an acquisition method of the AC spectrum of the adjustable coupler, which comprises the following steps:
executing a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with the frequency of an AC voltage and a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the AC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
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 acquisition device of the AC spectrum of the adjustable coupler, which comprises:
the first experiment execution unit is configured to execute a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with the frequency of an AC voltage and a control signal, the adjustable coupler is coupled with the first quantum bit, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the AC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
a spectrum acquisition unit configured to acquire an AC spectrum of the tunable coupler based on the change condition.
Based on the same inventive concept, the invention also provides a quantum control system, which utilizes the method for acquiring the DC spectrum of the adjustable coupler in any one of the above feature descriptions, or utilizes the method for acquiring the AC spectrum of the adjustable coupler in the above feature descriptions, or comprises the device for acquiring the DC spectrum of the adjustable coupler in the above feature descriptions, or comprises the device for acquiring the AC spectrum of the adjustable coupler in the above feature descriptions.
Based on the same inventive concept, the invention also provides a quantum computer, which comprises the quantum control system described in the above characteristic description.
Based on the same inventive concept, the present invention also proposes a readable storage medium, on which a computer program is stored, which when being executed by a processor, enables the method for obtaining the DC spectrum of the adjustable coupler described in any of the above-mentioned feature descriptions, or the method for obtaining the AC spectrum of the adjustable coupler described in the above-mentioned feature descriptions.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for acquiring a DC spectrum of an adjustable coupler, which comprises the steps of firstly executing a first experiment on the adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal used for adjusting the quantum state of the first quantum bit; a DC spectrum of the tunable coupler is then obtained based on the variation. Based on the scheme of the application, the DC spectrum of the adjustable coupler can be indirectly obtained through the matching of the quantum bit coupled with the adjustable coupler, so that the test characterization 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, and the acquisition method of the DC spectrum of the adjustable coupler belong to the same conception, so that the acquisition device has the same beneficial effects and is not repeated herein.
Drawings
FIG. 1 is a schematic flow chart of a method for acquiring DC spectrum of an adjustable coupler according to the embodiment of the invention;
FIG. 2 is a schematic diagram 1 of the result obtained after performing the first experiment on the tunable coupler and the first qubit in one embodiment;
FIG. 3 is a schematic diagram of the result 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 the fitting process of the first experimental result;
fig. 5 is a schematic structural diagram of an apparatus for acquiring DC spectrum of an adjustable coupler according to an embodiment of the present invention;
fig. 6 is a schematic flow chart 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 AC spectrum acquisition device of an adjustable coupler according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the drawings. Advantages and features of the invention will become more apparent from the following description and claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Referring to fig. 1, an embodiment of the present application provides a method for obtaining a DC spectrum of an adjustable coupler, which is characterized by comprising:
s10: executing a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
s20: and acquiring a DC spectrum of the adjustable coupler based on the change condition.
The method for acquiring the DC spectrum of the adjustable coupler is characterized by comprising the steps of firstly executing a first experiment on the adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the variation condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit; a DC spectrum of the tunable coupler is then obtained based on the variation. Based on the scheme of the application, the DC spectrum of the adjustable coupler can be indirectly obtained through the matching of the quantum bit coupled with the adjustable coupler, so that the test characterization of the performance parameters of the quantum chip is completed, and the technical blank is made up.
The experimental results of the first experiment may refer to fig. 2 and 3, where fig. 2 and 3 are the results obtained after the first experiment is performed on the tunable coupler and the first qubit in a certain embodiment, fig. 2 and 3 are three-dimensional diagrams, the abscissa is the DC voltage, the ordinate is the frequency of the control signal, and the color change represents a different amplitude change.
A qubit and an adjustable coupler may form a three-level system comprising three basis vectors |00>、|01>And |10>Wherein, |αβ>Representing the qubit occupancy as |alpha>The adjustable coupler occupies |beta>. In the three-energy level system, the quantum bit is loaded with one period driving, and the I00 can be used for>And |10>Coupled together. Furthermore, |01>And |10>The coupling strength between the two is g. The frequencies of the three energy levels are omega respectively 00 ＝0、ω 10 Omega, omega 01 . Here ω 10 ＝f 10 ，ω 01 ＝f 01 Wherein f 10 For the frequency of the qubit, f 01 Is the frequency of the adjustable coupler.
The hamilton consisting of the subspaces of 10> and 01> is:
the two eigenstates of the three-energy-level system are respectively:
the corresponding two eigenvalues are respectively:
where Δ=ω 01 -ω 10 At |01>And |10>In the case of equal energy, at this time When ω=ω 10 At this time, the three-level system cannot be operated by |00>Excited to |10>And when ω=e +(-) ＝ω 10 At + (-) g, the three-level system may consist of |00>Respectively excite to I+>(|+>) The method comprises the steps of carrying out a first treatment on the surface of the At |01>And |10>In the case of far detuning of energy, for example, delta > 0, |phi> ± ≈|10>(|01>) Then it can pass through ω=ω 10 -g 2 The three-energy level system is formed by |00 by delta>Excited to |10>。
Based on the above description, the applicant further studies found that when the equivalent qubit and the frequency of the tunable coupler do not resonate, if we excite the qubit only at one excitation frequency, the essential reason is that only one of the corresponding eigenstates contains a larger |10>, and we cannot observe the energy level splitting phenomenon in the experimental result of the first experiment. When the frequency of the equivalent qubit is equal to that of the adjustable coupler, namely resonance occurs, the qubit is excited at the moment, and bit excitation can be realized at different frequencies, so that the phenomenon of energy level splitting can be observed in the experimental result of the first experiment, and the essence is that two eigenstates comprise larger |10>. The area in the dashed line boxes in fig. 2 and 3 is the area where the energy level splitting occurs, and at several points in this area, the qubit is equal to the frequency of the tunable coupler, and by using this principle, we can indirectly obtain the frequency of the tunable coupler and the corresponding DC voltage.
In this embodiment, the performing a first experiment on the tunable coupler and the first qubit includes:
configuring a traversal range of the DC voltage to be a first range;
configuring a traversal range of the frequency of the control signal as a second range;
traversing the DC voltage over the first range and traversing the frequency of the control signal applied to the first qubit over the second range each time the DC voltage is traversed;
the first amplitude of the first qubit is obtained along with the change condition of the DC voltage and the frequency of a control signal.
Specifically, in the present embodiment, the DC voltage is traversed in a first step within the first range, wherein the first step is preconfigured. And traversing the frequency of the control signal according to a second step length in the second range, wherein the second step length is preset.
Specifically, in an embodiment of the present application, the obtaining, based on the variation condition, a DC spectrum of the tunable coupler includes:
acquiring coordinate information of a plurality of points at an 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 a DC spectrum of the adjustable coupler based on the coordinate information.
Referring to fig. 2 to 4, several coordinates in the a and B regions of fig. 4 are obtained from the energy level split of fig. 2 and 3. After acquiring the coordinates, further, the acquiring the DC spectrum of the tunable coupler based on the coordinate information includes:
and carrying out fitting processing on the data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
In this embodiment, after a plurality of coordinate information is obtained from the energy level splitting positions in fig. 2 and 3, the coordinate information is subjected to fitting processing, so that a curve of the entire DC spectrum can be fitted, and specifically, reference may be made to fig. 4.
Further, in order to make it possible to fit the DC spectrum of the tunable coupler more accurately, the applicant proposes to fit the coordinate information by means of a fitting function, in particular to fit the data contained in the coordinate information according to the following fitting function:
where x is the DC voltage, y is the frequency of the control signal, A, B, d, m, δ are parameters of the fitting function.
Based on the same inventive concept, please refer to fig. 5, an apparatus for obtaining a DC spectrum of an adjustable coupler is further provided in an embodiment of the present application, 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 condition of a first amplitude of the first qubit 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 DC working 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 20 configured to acquire a DC spectrum of the tunable coupler based on the variation situation.
It will be appreciated that the first experiment execution unit 10 and the spectrum acquisition unit 20 may be combined 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 first experiment execution unit 10 and the spectrum acquisition unit 20 may be combined with at least part of the functions of the other modules and implemented in one functional module. According to embodiments 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 in part as hardware circuitry, 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 any other reasonable way of integrating or packaging circuitry, or the like, hardware or firmware, or a suitable combination of the three. Alternatively, at least one of the first experiment performing unit 10 and the spectrum acquisition unit 20 may be at least partially implemented as a computer program module, which may perform the functions of the respective module when the program is run by a computer.
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: executing a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with the frequency of an AC voltage and a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the AC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
s200: and acquiring an AC spectrum of the adjustable coupler based on the change condition.
Based on the same inventive concept, please refer to fig. 7, an apparatus for obtaining an AC spectrum of an adjustable coupler is further provided in an embodiment of the present application, which is characterized in that the apparatus includes:
a first experiment execution unit 100 configured to execute a first experiment on an adjustable coupler and a first qubit, where the first experiment is used to obtain a variation condition of a first amplitude of the first qubit 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 reading cavity of the first qubit, the AC voltage is a dc working 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 200 configured to acquire an AC spectrum of the tunable coupler based on the variation situation.
It will be appreciated that the first experiment execution unit 100 and the spectrum acquisition unit 200 may be combined 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 the other modules and implemented in one functional module. According to embodiments of the present invention, at least one of the first experiment execution unit 100 and the spectrum acquisition unit 200 may be implemented at least in part as hardware circuitry, 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 any other reasonable way of integrating or packaging circuitry, or the like, hardware or firmware, or a suitable combination of the three implementations of software, hardware, and firmware. Alternatively, at least one of the first experiment performing unit 100 and the spectrum acquisition unit 200 may be at least partially implemented as a computer program module, which may perform the functions of the respective module when the program is run by a computer.
Based on the same inventive concept, the embodiments of the present application further provide a quantum control system, which uses the method for acquiring the DC spectrum of the adjustable coupler described in any one of the above feature descriptions, or uses the method for acquiring the AC spectrum of the adjustable coupler described in the above feature descriptions, or includes the apparatus for acquiring the DC spectrum of the adjustable coupler described in the above feature descriptions, or includes the apparatus for acquiring the AC spectrum of the adjustable coupler described in the above feature descriptions.
Based on the same inventive concept, the embodiments of the present application also provide a quantum computer, including the quantum control system described in the above feature description.
Based on the same inventive concept, the embodiments of the present application further provide a readable storage medium, on which a computer program is stored, where the computer program when executed by a processor can implement a method for obtaining a DC spectrum of an adjustable coupler as described in any one of the above feature descriptions, or implement a method for obtaining an AC spectrum of an adjustable coupler as described in the above feature descriptions.
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 storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the preceding. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer program 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 transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface 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 assembly 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 kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present invention are implemented by personalizing electronic circuitry, such as programmable logic circuits, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information for a computer program, which can execute computer-readable program instructions.
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, when executed by 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. These computer programs 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 includes 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 is executed 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 of the present specification, a description of the terms "one embodiment," "some embodiments," "examples," or "particular examples," etc., means 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, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the invention without departing from the scope of the technical solution of the invention, and the technical solution of the invention is not departing from the scope of the invention.
Claims (11)
1. A method for obtaining a DC spectrum of an adjustable coupler, comprising:
executing a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
acquiring coordinate information of a plurality of points at an 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 carrying out fitting processing on the data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
2. The method of claim 1, wherein the performing a first experiment on the tunable coupler and the first qubit comprises:
configuring a traversal range of the DC voltage to be a first range;
configuring a traversal range of the frequency of the control signal as a second range;
traversing the DC voltage over the first range and traversing the frequency of the control signal applied to the first qubit over the second range each time the DC voltage is traversed;
the first amplitude of the first qubit is obtained along with the change condition of the DC voltage and the frequency of a control signal.
3. The method of claim 2, wherein the DC voltage is traversed in a first step within the first range, wherein the first step is preconfigured.
4. The method of claim 2, wherein the frequency of the control signal is traversed in a second step within the second range, wherein the second step is preconfigured.
5. The method of claim 1, wherein the data contained in the coordinate information is fitted according to the following fitting function:
where x is the DC voltage, y is the frequency of the control signal, A, B, d, m, δ are parameters of the fitting function.
6. An apparatus for obtaining a DC spectrum of an adjustable coupler, comprising:
the first experiment execution unit is configured to execute a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with DC voltage and the frequency of a control signal, the adjustable coupler is coupled with the first quantum bit, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the DC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
a spectrum acquisition unit configured to acquire coordinate information of a plurality of points located at an energy level split based on the variation condition, the coordinate information including a value of the DC voltage and a value of a frequency of the corresponding control signal; and carrying out fitting processing on the data contained in the coordinate information to obtain a DC spectrum of the adjustable coupler.
7. A method for obtaining an AC spectrum of an adjustable coupler, comprising:
executing a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with the frequency of an AC voltage and a control signal, the adjustable coupler is connected with the first quantum bit in a coupling way, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the AC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
acquiring coordinate information of a plurality of points at an energy level splitting position based on the change condition, wherein the coordinate information comprises the value of the AC voltage and the value of the frequency of the corresponding control signal; and carrying out fitting processing on the data contained in the coordinate information to obtain the AC spectrum of the adjustable coupler.
8. An apparatus for obtaining an AC spectrum of an adjustable coupler, comprising:
the first experiment execution unit is configured to execute a first experiment on an adjustable coupler and a first quantum bit, wherein the first experiment is used for acquiring the change condition of a first amplitude of the first quantum bit along with the frequency of an AC voltage and a control signal, the adjustable coupler is coupled with the first quantum bit, the first amplitude is the amplitude of a first signal carrying quantum state information in a reading cavity of the first quantum bit, the AC voltage is the DC working voltage of the adjustable coupler, and the control signal is a signal for adjusting the quantum state of the first quantum bit;
a spectrum acquisition unit configured to acquire coordinate information of a plurality of points located at an energy level split based on the change condition, the coordinate information including a value of the AC voltage and a value of a frequency of the corresponding control signal; and carrying out fitting processing on the data contained in the coordinate information to obtain the AC spectrum of the adjustable coupler.
9. A quantum control system, characterized by using the method for acquiring a DC spectrum of an adjustable coupler according to any one of claims 1 to 5, or using the method for acquiring an AC spectrum of an adjustable coupler according to claim 7, or comprising the apparatus for acquiring a DC spectrum of an adjustable coupler according to claim 6, or comprising the apparatus for acquiring an AC spectrum of an adjustable coupler according to claim 8.
10. A quantum computer comprising the quantum control system of claim 9.
11. A readable storage medium having stored thereon a computer program, which when executed by a processor is capable of realizing the method of obtaining a DC spectrum of an adjustable coupler according to any one of claims 1-5 or of realizing the method of obtaining an AC spectrum of an adjustable coupler according to claim 7.
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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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| CN115470923A (en) | 2022-12-13 |
| WO2024041361A9 (en) | 2024-03-28 |
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