The present application claims priority to Chinese Patent Application No. CN202210948015.5, filed with the China National Intellectual Property Administration on Aug. 8, 2022, the disclosure of which is hereby incorporated herein by reference in its entirety.
The present disclosure relates to the field of computer technology, and, in particular, to the field of quantum chips and quantum computers.
In order to achieve adjustable coupling between qubits, a tunable coupler architecture is introduced to significantly improve core performance indicators such as quantum gating speed and quantum gate fidelity of a quantum chip. Therefore, how to design a tunable coupler has become an important problem in the field of quantum chips.
The present disclosure provides a coupling component applied to a quantum chip, a quantum chip, and a quantum computing device.
According to an aspect of the present disclosure, provided is a coupling component applied to a quantum chip, including: a first electrode plate; and a second electrode plate electrically connected to the first electrode plate. The first electrode plate includes a first coupling port disposed at a first end of the first electrode plate and a second coupling port disposed at a second end of the first electrode plate; and the first coupling port is used to couple a first qubit, and the second coupling port is used to couple a second qubit; and the second electrode plate includes a third coupling port disposed at a first end of the second electrode plate and a fourth coupling port disposed at a second end of the second electrode plate; and the third coupling port is used to couple the first qubit, and the fourth coupling port is used to couple the second qubit. Formed coupling strengths satisfy at least one of: a first coupling strength formed by coupling the first coupling port with the first qubit is different from a second coupling strength formed by coupling the second coupling port with the second qubit; and a third coupling strength formed by coupling the third coupling port with the first qubit is different from a fourth coupling strength formed by coupling the fourth coupling port with the second qubit.
According to another aspect of the present disclosure, provided is a quantum chip, including: a coupling component, a first qubit and a second qubit, where the coupling component is the above-mentioned coupling component.
According to another aspect of the present disclosure, provided is a quantum computing device, including: a quantum chip, and a controller configured to control the quantum chip, where the quantum chip is the above-mentioned quantum chip.
Thus, a configuration of the coupling component with adjustable coupling strength is provided. Moreover, this configuration is very flexible and can be applicable to the requirement of long-distance coupling of qubits, and provides a new technical route for the design and development of quantum chips.
It should be understood that the content described in this part is not intended to identify key or important features of embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will be easily understood by the following description.
The accompanying drawings are used to better understand the present solution, and do not constitute a limitation to the present disclosure.
Hereinafter, descriptions to exemplary embodiments of the present disclosure are made with reference to the accompanying drawings, include various details of the embodiments of the present disclosure to facilitate understanding, and should be considered as merely exemplary. Therefore, those having ordinary skill in the art should realize, various changes and modifications may be made to the embodiments described herein, without departing from the scope and spirit of the present disclosure. Likewise, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following descriptions.
As a landmark technology in the post-Moore era, quantum computing has become an important development direction in academia and industry. In terms of some specific problems (for example, decomposition of large numbers, simulation of complex quantum systems, etc.), quantum computing shows incomparable advantages over traditional computing. The research on various high-potential quantum applications has greatly advanced the development of quantum hardware. In terms of hardware implementation, the industry has a variety of candidate technical solutions, including superconducting circuit, ion trap, diamond NV color center, nuclear magnetic resonance, optical quantum system, and so on. Benefiting from advantages such as long decoherence time, easy manipulation/reading and strong expandability, superconducting circuits are considered to be one of the most promising candidates for quantum computing hardware. With the advancement of micro-nano processing technology, the design and production of quantum chips integrating a plurality of qubits are becoming more and more important. In recent years, the domestic and foreign quantum computing technology companies/research institutions have successively developed superconducting quantum chips.
As the basic element of quantum chips, the qubit (quantum bit) usually consists of a capacitor and a Josephson junction in parallel. For the manipulation of a single qubit, a single-bit quantum gate can be realized. To realize a two-bit quantum gate, two qubits need to be coupled together. In order to achieve the tunable coupling between qubits (that is, achieve the “off” and “on” functions of the coupling as needed), a tunable coupler architecture is theoretically proposed.
Another important research shows that the correlation error between qubits decreases substantially as the distance between the qubits increases. More specifically, an experiment shows that the correlation error between qubits nearly disappears when the distance between the qubits is 3 mm. Moreover, the long distance between qubits can also greatly reduce the crosstalk between qubits, and at the same time, can also provide sufficient physical space for the design and wiring of core components such as a resonant cavity and filter. In short, the long-distance qubit design can not only improve the performance of a quantum chip, but also achieve greater freedom and more comprehensive functions of the entire design process.
However, existing couplers in the industry cannot take into account both “tunable coupler” and “long distance”, so the design of a tunable coupler with long-distance configuration has become a very important issue.
Based on this, the solution of the present disclosure proposes a novel tunable coupler configuration, specifically as shown in
That is to say, the solution of the present disclosure has three cases as follows.
The solution of the present disclosure does not limit the three cases described above, and any one of the three cases described above is within the protection scope of the solution of the present disclosure.
Thus, a configuration of the coupling component with adjustable coupling strength is provided. Moreover, this configuration is very flexible and can be applicable to the requirement of long-distance coupling of qubits, and provides a new technical route for the design and development of quantum chips.
Further, since the solution of the present disclosure can be applicable to the requirement of long-distance coupling of qubits, on the one hand, the structural support can be provided for reducing the control crosstalk and correlation error between qubits; and on the other hand, the solution of the present disclosure can also provide a wide range of design space for the distribution of devices in the quantum chip. For example, in the design stage of the quantum chip, each qubit can have an independent read cavity and filter, so as to reduce the read crosstalk between qubits, and thus improve the performance of the quantum chip greatly.
In a specific example, the above-mentioned electrode plate may specifically be a superconducting metal plate. Further, the quantum chip may also be specifically a superconducting quantum chip. At this time, the solution of the present disclosure can also provide a new technical route for the design and development of the superconducting quantum chip.
It should be noted that the solution of the present disclosure does not limit the features such as length and shape of the coupling port as well as the features such as length and shape of the first or second electrode plate, which can be set based on actual scene requirements. In other words, it can be understood that the structure shown in
In a specific example of the solution of the present disclosure, the first coupling strength formed by coupling the first port with the first qubit is greater than the second coupling strength formed by coupling the second coupling port with the second qubit; or the first coupling strength formed by coupling the first coupling port with the first qubit is less than the second coupling strength formed by coupling the second coupling port with the second qubit.
In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, the third coupling strength formed by coupling the third coupling port with the first qubit is greater than the fourth coupling strength formed by coupling the fourth coupling port with the second qubit; or the third coupling strength formed by coupling the third coupling port with the first qubit is less than the fourth coupling strength formed by coupling the fourth coupling port with the second qubit.
In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
For example, when the first coupling strength is different from the second coupling strength and the third coupling strength is different from the fourth coupling strength, there are the following cases.
Case 2: the first coupling strength is greater than the second coupling strength, and the third coupling strength is less than the fourth coupling strength. That is, the first coupling port for coupling with the first qubit is a strong coupling port, while the third coupling port for coupling with the first qubit is a weak coupling port; and the second coupling port for coupling with the second qubit is a weak coupling port, while the fourth coupling port for coupling with the second qubit is a strong coupling port.
It can be understood that the solution of the present disclosure does not specifically limit the above cases. In practical applications, the selection may be made based on specific requirements.
In a specific example of the solution of the present disclosure, the total coupling strength formed by the coupling component and the first qubit is the same as or different from the total coupling strength formed by the coupling component and the second qubit.
It can be understood that the total coupling strength formed with the first qubit includes the first coupling strength formed by the first coupling port of the first electrode plate and the first qubit, and the third coupling strength formed by the third coupling port of the second electrode plate and the first qubit.
Similarly, the total coupling strength formed with the second qubit includes the second coupling strength formed by the second coupling port of the first electrode plate and the second qubit, and the fourth coupling strength formed by the fourth coupling port of the second electrode plate and the second qubit.
In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, the coupling component is a symmetrical coupler. For example, in the scenario where the total coupling strength formed by the coupling component and the first qubit may be the same as the total coupling strength formed by the coupling component and the second qubit, for example, for the scenario of the above case 2 or 4, the total coupling strength formed by the coupling component and the first qubit may be the same as the total coupling strength formed by the coupling component and the second qubit. At this time, the coupling component described in the solution of the present disclosure may be specifically a symmetrical coupler, thus enriching the usage scenarios of the solution of the present disclosure and further laying a foundation for being suitable for the requirement of long-distance coupling of qubits.
In a specific example of the solution of the present disclosure, the first electrode plate and the second electrode plate are arranged at interval in a first direction. For example, as shown in
It should be noted that the solution of the present disclosure does not specifically limit the interval between the two electrode plates, which can be set based on actual scene requirements.
In this way, an inter-plate configuration that is a simple configuration and is easy for engineering promotion is provided, to lay a foundation for expanding the scale of the quantum chip and enabling the quantum chip to have a larger wiring space, and also provide structural support for being more suitable for long-distance coupling of qubits.
In a specific example of the solution of the present disclosure, a first orthographic projection of the first electrode plate on a specific plane at least partially overlaps with a second orthographic projection of the second electrode plate on the specific plane, where the specific plane is perpendicular to the first direction. For example, the first electrode plate and the second electrode plate are arranged correspondingly. At this time, the orthographic projections of the two electrode plates on a specific plane partially or completely overlap, thus providing structural support for being more suitable for long-distance coupling of qubits.
In a specific example of the solution of the present disclosure, a body of the first electrode plate extends in a second direction different from the first direction, so that the first end of the first electrode plate and the second end of the first electrode plate are arranged in the second direction, thus providing structural support for being more suitable for long-distance coupling of qubits.
In an example, as shown in
It can be understood that the structure shown in
In a specific example of the solution of the present disclosure, the first coupling port and the third coupling port for coupling with the first qubit are aligned or misaligned in the first direction. For example, as shown in
In a specific example of the solution of the present disclosure, a body of the second electrode plate extends in a second direction different from the first direction, so that the first end of the second electrode plate and the second end of the second electrode plate are arranged in the second direction, thus providing structural support for being more suitable for long-distance coupling of qubits.
In an example, as shown in
It can be understood that the structure shown in
In a specific example of the solution of the present disclosure, the second coupling port and the fourth coupling port for coupling with the second qubit are aligned or misaligned in the first direction. For example, as shown in
In a specific example of the solution of the present disclosure, as shown in
In a specific example, the quantum interference device 103 is a Superconducting Quantum Interference Device (SQUID).
In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, the quantum interference device includes two Josephson junction chains in parallel, and the Josephson junction chains are connected to the first electrode plate and the second electrode plate respectively. In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, the Josephson junction chain contains at least one Josephson junction. For example, as shown in
In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, when the Josephson junction chain contains two or more Josephson junctions, the two or more Josephson junctions are connected in series. In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, the quantities of Josephson junctions contained in different Josephson junction chains are same or different. In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, a coplanar capacitance can be formed between the first electrode plate 101 and the second electrode plate 102. In this way, a coupling component with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, a frequency adjustment of the coupling component is capable of adjusting a coupling strength between the first qubit and the second qubit during operation of the coupling component. In this way, the coupling component described in the solution of the present disclosure may be used as a tunable coupler, laying a foundation for flexibly adjusting the coupling strength between two qubits, and thus laying a foundation for improving the performance of the quantum chip.
In a specific example of the solution of the present disclosure, a frequency adjustment of the coupling component is capable of turning on or off coupling between the first qubit and the second qubit during operation of the coupling component.
In this way, the solution of the present disclosure provides a coupling component suitable for the case of long-distance coupling of qubits, and can realize the coupling of two qubits within the interval in which the frequency of the coupling component is lower than that of qubits, to thereby realize turning on and off the coupling of two qubits.
In a specific example of the solution of the present disclosure, an adjustment of a magnetic flux of the quantum interference device is capable of adjusting a frequency of the coupling component during operation of the coupling component. In this way, a simple and feasible solution for adjusting the frequency of the coupling component is provided, to thereby provide support for implementation of adjusting the coupling strength between two qubits and implementation of turning on and off the coupling of two qubits.
In a specific example of the solution of the present disclosure, as shown in
In a specific example of the solution of the present disclosure, the coupling component is a floating ground coupler. In this way, a floating ground coupler with highly wide applicability is provided, to lay a foundation for flexibly adjusting the coupling strength between two qubits, and thus lay a foundation for improving the performance of the quantum chip.
To sum up, the coupling component provided in the solution of the present disclosure has the following advantages.
The solution of the present disclosure further provides a quantum chip, including: a coupling component which is the coupling component described above, a first qubit and a second qubit.
In this way, benefiting from the introduction of the tunable coupling component of the solution of the present disclosure, the core performance indicators such as quantum gating speed and quantum gate fidelity of the quantum chip can be significantly improved.
Further, due to the use of the tunable coupling component of the solution of the present disclosure, the advantages of long-distance coupling between qubits can be fully utilized. Also, in terms of performance, the crosstalk and correlation error between qubits in the quantum chip can be reduced; and in terms of layout, a wide space can also be provided for wiring and device distribution, thus providing a new technical route for the design and development of the high-performance quantum chip (such as high-performance superconducting quantum chip).
The solution of the present disclosure further provides a quantum computing device, including: a quantum chip which is the quantum chip described above, and a controller configured to control the quantum chip.
In this way, benefiting from the introduction of the tunable coupling component of the solution of the present disclosure, the core performance indicators such as quantum gating speed and quantum gate fidelity in the quantum computing device can be significantly improved.
Further, due to the use of the tunable coupling component of the solution of the present disclosure, the advantages of long-distance coupling between qubits can be fully utilized. Also, in terms of performance, the crosstalk and correlation error between qubits in the quantum chip can be reduced, and at the same time, the wide space can also be provided for wiring and device distribution.
The solution of the present disclosure will be further described in detail below with reference to specific examples. Specifically, the solution of the present disclosure provides a novel tunable coupler of floating ground type, including two electrode plates in an upper and lower configuration, and each electrode plate has two coupling ports coupling with qubits. For each electrode plate, the two coupling ports may be divided into a strong coupling port and a weak coupling port according to the coupling strength; and in practical applications, the tunable coupler of floating ground type may form a symmetrical tunable coupler of floating ground type according to the position distribution of ports of different types.
Thus, the tunable coupler of floating ground type described in the solution of the present disclosure can be perfectly applied to the long-distance coupling scenarios. Moreover, under the condition of satisfying the long distance, the tunable coupler of floating ground type in the solution of the present disclosure also has the following frequency feature that the frequency of the tunable coupler of floating ground type is less than the qubit frequency, so as to realize turning on and off the coupling between two qubits, and also provide the tunable coupling strength when the coupling is turned on.
Moreover, the tunable coupler of floating ground type in the solution of the present disclosure can give full play to the advantages of long-distance coupling between qubits. Thus, in terms of performance, the crosstalk and correlation error between qubits in the quantum chip can be reduced effectively; and in terms of layout of the quantum chip, a wide space can be provided for wiring and device distribution.
It should be noted that the electrode plate may specifically be a superconducting metal plate in this example.
Further, the content of the solution of the present disclosure will be described in detail from several parts below. The Part I introduces the configuration of the tunable coupler of floating ground type proposed in the solution of the present disclosure; and the Part II demonstrates the validity and advantages of the configuration of the tunable coupler of floating ground type in the solution of the present disclosure.
The tunable coupler of floating ground type in the solution of the present disclosure includes: two electrode plates distributed up and down; and both ends of each electrode plate have a strong coupling port and a weak coupling port, and the coupling ports coupling with a same qubit in the two electrode plates are aligned or misaligned.
Specifically, as shown in
Further, as shown in
Here, the superconducting quantum interference device 103 includes two Josephson junction chains in parallel; and each of the Josephson junction chains is connected to the first electrode plate 101 and the second electrode plate 102 respectively; and further, the Josephson junction chain contains at least one Josephson junction. In an example, as shown in
It can be understood that the above Josephson junction chain is only illustrative. In practical applications, the solution of the present disclosure does not limit the quantity of Josephson junctions in the Josephson junction chain, and the quantities of Josephson junctions contained in different Josephson junction chains are same or different.
Further, as shown in
Here, in an example, the first direction may specifically be the longitudinal direction.
Further, the first electrode plate 101 includes two coupling ports, namely a first coupling port 1011 and a second coupling port 1012, where the first coupling strength formed by coupling the first coupling port 1011 with the first qubit Q1 is greater than the second coupling strength formed by coupling the second coupling port 1012 with the second qubit Q2, that is, in the first electrode plate 101, the first coupling port 1011 on the left side is a strong coupling port, and the second coupling port 1012 on the right side is a weak coupling port.
Further, the second electrode plate 102 includes two coupling ports, namely a third coupling port 1021 and a fourth coupling port 1022, where the third coupling strength formed by coupling the third coupling port 1021 with the first qubit Q1 is less than the fourth coupling strength formed by coupling the fourth coupling port 1022 with the second qubit Q2, that is, in the second electrode plate 102, the third coupling port 1021 on the left side is a weak coupling port, and the fourth coupling port 1022 on the right side is a strong coupling port.
Here, the body of the first electrode plate 101 extends in the second direction different from the first direction, so that the first end of the first electrode plate 101 and the second end of the first electrode plate 101 are arranged in the second direction, that is, the first coupling port 1011 and the second coupling port 1012 of the first electrode plate 101 are arranged in the second direction.
Further, the body of the second electrode plate 102 extends in the second direction different from the first direction, so that the first end of the second electrode plate 102 and the second end of the second electrode plate 102 are arranged in the second direction, that is, the third coupling port 1021 and the fourth coupling port 1022 of the second electrode plate 102 are arranged in the second direction.
Further, the first coupling port 1011 and the third coupling port 1021 for coupling with the first qubit Q1 are aligned or misaligned.
Here, in a specific example, the second direction may specifically be the horizontal direction.
Further, the first qubit Q1 and the second qubit Q2 are also arranged in the second direction, so that it is convenient to indirectly couple the first qubit Q1 and the second qubit Q2 through the tunable coupler of floating ground type.
It should be noted that the above description that the first direction is the longitudinal direction, and the second direction is the horizontal direction is only exemplary description. In practical applications, there may also be other setting methods, which are not limited in the solution of the present disclosure.
During the operation of the tunable coupler of floating ground type, the tunable coupler of floating ground type can adjust the coupling strength between the first qubit Q1 and the second qubit Q2. For example, the coupling strength between the first qubit Q1 and the second qubit Q2 is adjusted by adjusting the frequency of the tunable coupler of floating ground type. Further, the frequency of the tunable coupler of floating ground type is adjusted by adjusting the magnetic flux of the superconducting quantum interference device 103, to thereby adjust the coupling strength between the first qubit Q1 and the second qubit Q2, and also realize turning on or off the coupling between the first qubit Q1 and the second qubit Q2.
In this way, the first qubit Q1 is respectively coupled with a strong coupling port (such as the first coupling port 1011) and a weak coupling port (such as the third coupling port 1021), and the second qubit Q2 is also respectively coupled with a strong coupling port (such as the fourth coupling port 1022) and a weak coupling port (such as the second coupling port 1012), so the coupler described in the solution of the present disclosure is also specifically a symmetrical tunable coupler.
It should be noted that the configuration of the solution of the present disclosure is not limited, for example, the shape of the electrode plate, the size of the electrode plate, the shape of the coupling port, the size of the coupling port, the horizontal or vertical distance between the electrode plate and the ground, and the position and size of the SQUID can be set according to the specific coupling situation. In other words, as long as two electrode plates are arranged at interval in the first direction and connected through the SQUID, and at least one electrode plate includes a weak coupling port and a strong coupling port, then the tunable couplers with this configuration are all within the protection scope of the solution of the present disclosure. For example, the tunable coupler of floating ground type as shown in
The core advantage of the tunable coupler configuration of floating ground type in the solution of the present disclosure is that it can be perfectly applicable to the case of long-distance coupling of qubits, which is specifically reflected in the following three points.
As shown in
denoted by formula (1).
When the length of the tunable coupler of floating ground type becomes longer, C1 and C2 will increase accordingly, and at this time, Ceff will increase accordingly.
Further, the eigenfrequency f of the tunable coupler of floating ground type is:
denoted by Formula (2).
As can be seen, when the element inductance value LJ in the tunable coupler of floating ground type is determined, the larger the Ceff, the less the eigenfrequency f of the tunable coupler of floating ground type, so that the above-mentioned frequency condition can be satisfied.
Moreover, under the long distance condition, the tunable coupler of floating ground type of the solution of the present disclosure can satisfy the turning-off condition of coupling between two qubits, and can provide a certain coupling strength when the coupling is turned on.
Further, the tunable coupler of floating ground type described in the solution of the present disclosure will be verified by specific examples below; and specifically, the configuration shown in
Further, based on the sizes in
Further, under the configuration with the sizes shown in
Further, in this example, the qubit of floating ground type similar to the structure of the tunable coupler of floating ground type is used to obtain a configuration of “qubit-coupler-qubit” as shown in
As can be seen from the above table, in the “Qubit-Coupler-Qubit” structure, the coupling strength between qubits is controlled by applying a direct-current (DC) signal to the tunable coupler of floating ground type (and adjusting the frequency of the tunable coupler of floating ground type).
Further,
The above example is sufficient to illustrate that the tunable coupler configuration of floating ground type in the solution of the present disclosure can, under the condition of long-distance coupling of qubits, satisfy the frequency condition of turning on and off the coupling between two qubits when the frequency of the tunable coupler of floating ground type is less than the frequency of the qubits.
It should be noted that, in order to adjust the coupling strength between qubits, the capacitance parameters can also be changed by fine-tuning the sizes of components at the design level, in addition to adding a DC signal to equivalently adjust the frequency of the tunable coupler of floating ground type at the experimental level, so as to realize the regulation of the coupling strength.
In the above example, with the coupler configuration of the solution of the present disclosure, there are as many as 17 capacitive parameters that can be adjusted (see Table 1). It can be seen that the tunable coupler of floating ground type in the solution of the present disclosure is more universal and more applicable to the case of long-distance coupling between qubits than other general coupler configurations. The solution of the present disclosure provides a new technical route for the design and development of the high-performance superconducting quantum chip.
Thus, compared with the existing tunable coupler configuration, the core advantages of the tunable coupler configuration of floating ground type in the solution of the present disclosure are as follows: this tunable coupler configuration can be better applicable to the case of long-distance coupling of qubits, so that the superconducting quantum chip can use the long-distance coupling architecture and can also give full play to the huge advantages of this architecture to reduce the crosstalk and correlation error and expand the space for wiring and device distribution, thereby improving the performance of the quantum chip and also making the design of the quantum chip more free, simple and convenient.
Specifically, the solution of the present disclosure has the following advantages.
The foregoing specific implementations do not constitute a limitation on the protection scope of the present disclosure. Those having ordinary skill in the art will appreciate that various modifications, combinations, sub-combinations and substitutions may be made according to a design requirement and other factors. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.
Number | Date | Country | Kind |
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202210948015.5 | Aug 2022 | CN | national |