Quantum computing device and filter

Abstract

The utility model discloses a quantum computing device and filter, which comprises a pump source in a room temperature environment, a quantum computing chip and an amplifier chip in a low temperature environment, the quantum computing chip comprises a quantum bit and a resonant cavity, an input end and a first connecting end, and a first filter, the amplifier chip comprises a second connecting end, an output end, a second filter, an amplifier and a third filter, the resonant cavity responds to an input signal to obtain an output signal carrying information of the resonant cavity and the quantum bit, the amplifier amplifies the output signal, each filter filters and processes the passing signal, and the filter parameters of a plurality of lumped parameter resonant cavities connected in series are configured to make the filter have two available band passes allowing effective signals to pass and an attenuation section between the two available band passes. The quantum computing device can improve the reading speed and fidelity of the quantum bit, does not need a separate isolator, reduces the hardware and space cost of the device, and is convenient for miniaturization of the device.

Description

Technical Field

[0001] This utility model relates to the field of quantum computing technology, and in particular to a quantum computing device and filter. Background Technology

[0002] In current superconducting chip designs, the following two measures are typically employed to improve the readout speed and fidelity of superconducting qubits:

[0003] 1) Adding a Purcell filter to the superconducting chip allows for increased bit-read cavity coupling strength while protecting bit decoherence time. (Participate) Figure 1 As shown, at the quantum computing chip end, the qubit, readout cavity, and filter are connected in sequence. Both the input and output ends are connected to the filter. The filtered qubit signal is read and then transmitted to the amplifier chip.

[0004] 2) Add a quantum low-noise parametric amplifier to the readout circuit within the dilution refrigerator to improve the signal-to-noise ratio of the readout signal. See [link to relevant documentation]. Figure 1 As shown, an amplifier is installed in the amplifier chip, and the amplifier chip is connected to a pump source in a room temperature environment.

[0005] For the first approach, since current chip-level Purcell filters are generally implemented using distributed coplanar waveguide resonant cavities, these filters typically only cover the frequency band of a single or a few readout cavities, increasing the difficulty of chip design and fabrication. Furthermore, Purcell filter design usually prioritizes bit readout performance without considering other environmental factors. Environmental noise on the readout line can only be mitigated by adding more microwave devices, such as filters, attenuators, and isolators.

[0006] For the second approach, since the quantum low-noise parametric amplifier (QLP) can provide an amplification factor of approximately 20 dB with only an additional quantum-limiting noise, and the QLP requires a strong pump signal to operate, the pump signal frequency is typically chosen within its amplification gain band in current designs. This means the pump signal frequency is very close to the read signal frequency of the QLP. To prevent the QLP from being affected by leaked or amplified residual pump signals, an isolator is usually added between the QLP and the superconducting QLP chip. For example... Figure 1 The circulator shown.

[0007] Current technologies require the addition of separate cryogenic isolation devices, increasing hardware costs and consuming additional space for dilution refrigerators, resulting in high space costs. As quantum computing devices evolve towards kilobitium-level chips, this excessive space occupation will have an increasingly significant impact on their performance and hinder miniaturization. Utility Model Content

[0008] In view of the above problems, this utility model is proposed to provide a quantum computing device and filter that overcomes or at least partially solves the above problems.

[0009] This utility model provides a quantum computing device, including: a pump source disposed in a room temperature environment, a quantum computing chip disposed in a low temperature environment, and an amplifier chip;

[0010] The quantum computing chip includes qubits and a resonant cavity, an input terminal connected to the resonant cavity and a first connection terminal for connecting an amplifier chip, and at least one first filter disposed between the resonant cavity and the first connection terminal; the amplifier chip includes a second connection terminal that can be connected to the first connection terminal, an output terminal, and at least one second filter, an amplifier and at least one third filter connected in sequence between the two.

[0011] The resonant cavity of the quantum computing chip is used to respond to the quantum computing input signal and obtain the quantum computing output signal carrying the information of the resonant cavity and the qubit.

[0012] The amplifier is used to amplify the passing quantum computing signal under the action of the pump source signal;

[0013] Each filter is used to filter the passing quantum computing signal; each filter includes multiple lumped parameter resonators connected in series, the multiple lumped parameter resonators have configurable filtering parameters, and the filter is configured with two available bandpasses that allow the effective quantum computing signal to pass through and an attenuation section between the two available bandpasses for attenuating and filtering the pump source signal.

[0014] In some optional embodiments, it further includes at least one fourth filter disposed between the quantum computing chip input terminal and the resonant cavity, for filtering the quantum computing input signal and then providing it to the resonant cavity.

[0015] In some alternative embodiments, the frequency ranges of the two available bandpass segments are determined based on the effective frequency range of the quantum computing chip; the frequency range of the attenuation segment is determined based on the effective frequency ranges of the amplifier and the pump source.

[0016] In some optional embodiments, the lower limit of the frequency range of the two available bandpass segments is no greater than 6 GHz and the upper limit is no less than 8 GHz. The length of the attenuation segment between the two available bandpass segments is 50 to 200 MHz, and the lower limit of the frequency range of the attenuation segment is no less than 6.9 GHz and the upper limit is no greater than 7.1 GHz. The signal attenuation amplitude is greater than 30 dB.

[0017] In some alternative embodiments, the two available bandpass frequency ranges are 6.5–6.9 GHz and 7.1–7.5 GHz, respectively.

[0018] The frequency range of the attenuation band is 6.9~7.1 GHz, and the signal attenuation is 30dB~40dB.

[0019] In some alternative embodiments, the number of lumped-parameter resonant cavities connected in series is 4-8.

[0020] In some alternative embodiments, the filter includes a plurality of cascaded lumped-parameter resonators with intrinsic frequencies designed to be 6.9 to 7.1 GHz, and the plurality of cascaded lumped-parameter resonators are configured such that the coupling strength between the resonators is adjustable to form the attenuation band near the intrinsic frequencies.

[0021] This utility model provides a filter, including: multiple lumped parameter resonant cavities connected in series;

[0022] The filter is used to filter the quantum computing signal; the plurality of lumped parameter resonant cavities have configurable filtering parameters, and the filter is configured with two available bandpasses that allow the effective quantum computing signal to pass through and an attenuation section between the two available bandpasses for attenuating and filtering the pump source signal.

[0023] In some alternative embodiments, the frequency ranges of the two available bandpass segments are determined based on the effective frequency range of the quantum computing chip; the frequency range of the attenuation segment is determined based on the effective frequency ranges of the amplifier and the pump source.

[0024] In some alternative embodiments, the number of lumped-parameter resonant cavities connected in series is 4-8.

[0025] The beneficial effects of the above-mentioned technical solutions provided by the embodiments of this utility model include at least the following:

[0026] The quantum computing device provided in this embodiment uses a filter to filter the signals from the quantum computing chip and the amplifier chip. The filter employs a multi-lumped parameter resonant cavity structure connected in series. By setting the filtering parameters of the resonant cavities, the filter has two usable bandpasses that allow effective quantum computing signals to pass through, and an attenuation band between the two usable bandpasses for attenuating and filtering pump source signals. This filter allows effective quantum computing signals to pass through while filtering out various environmental noises, including pump source signals, without the need for isolators. It effectively isolates pump source signals with frequencies close to the quantum computing signals, simplifies the structure of the quantum computing device, reduces hardware costs, saves space in low-temperature environments, and is more conducive to the miniaturization design of the device.

[0027] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0028] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of a traditional quantum computing device in the existing technology.

[0031] Figure 2 This is a schematic diagram of a traditional filter.

[0032] Figure 3 This is a schematic diagram of the structure of the quantum computing device in an embodiment of this utility model.

[0033] Figure 4 This is a schematic diagram of the dual bandpass filter in an embodiment of the present invention.

[0034] Figure 5 This is an example diagram showing the measurement results of the scattering parameters of the dual bandpass filter in an embodiment of this utility model.

[0035] Figure 6 As an embodiment of this utility model Figure 5 A magnified view of the bandpass frequency band.

[0036] Figure 7This is a flowchart of the quantum computing signal processing method in an embodiment of this utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Quantum computing chip; 2. Amplifier chip; 3. Pump source;

[0039] 11. Quantum bit; 12. Resonant cavity; 13. Input terminal; 14. First connection terminal; 15. First filter; 16. Fourth filter; 151. Lumped parameter resonant cavity;

[0040] 21. Second connection terminal; 22. Output terminal; 23. Second filter; 24. Amplifier; 25. Third filter. Detailed Implementation

[0041] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0042] To address the issue that existing technologies require additional filters and parametric amplifiers to improve the readout speed and fidelity of superconducting qubits, resulting in high hardware and space costs and hindering device miniaturization, this invention provides a quantum computing device and a quantum computing signal processing method. By improving the filter structure and optimizing the filtering effect, filtering and amplifying qubit signals can be achieved without using an isolator, thereby improving the readout speed and fidelity of qubits. Simultaneously, it reduces the hardware and space costs of the quantum computing device, facilitating its miniaturization design.

[0043] The following are explanations of some of the components and technical terms used in this application:

[0044] Purcell filter: A band-stop or band-pass filter inserted between the resonator and the output line to suppress resonator-mediated qubit decay.

[0045] Superconducting qubits typically incorporate superconductors, capacitors, and inductors. To achieve quantum state readout and reset, they are usually coupled to a resonant cavity. To improve readout and reset speeds, the decay rate of the resonant cavity (the readout cavity) can be designed to be higher. However, due to the Purcell effect, this causes the qubit to decoherently through the resonant cavity more quickly, affecting the qubit lifetime. Purcell filters, by introducing a mode suppression cavity, can mitigate this effect by reducing the decay rate near the qubit frequency, but generally require a separate resonant cavity outside the readout cavity.

[0046] For existing filter structures, see Figure 2 As shown, the main body of the filter is a signal processing unit, which is usually a circuit composed of inductors, capacitors and other components. Its function is to filter the input signal by frequency, allowing signals of a specific frequency to pass through and suppressing signals of other frequencies. The filter has a raw signal input port on the left, and a signal output port on the top and right. The output port on the right outputs the final signal that meets the filtering requirements, while the output port on the top can be used as a shunt or feedback signal output terminal. For example, it can shunt the raw signal before filtering and output it to a designated device, or connect a feedback loop and provide a feedback signal.

[0047] Parametric amplification is a physical mechanism that achieves energy transfer based on nonlinear effects. It amplifies signals by periodically modulating system parameters such as inductance and capacitance.

[0048] Quantum low-noise parametric amplifiers include, but are not limited to, traveling-wave parametric amplifiers (TWPAs) and Josephson parametric amplifiers (JPAs). TWPAs rely on the nonlinear response of the physical system to generate amplification, enabling them to amplify weak microwave signals approaching the quantum limit with a large bandwidth. JPAs refer to parametric amplifiers based on the Josephson effect.

[0049] This utility model embodiment also provides a quantum computing device, the structure of which is as follows: Figure 3 As shown, the system includes: a pump source 3 disposed in a room temperature environment, a quantum computing chip 1 disposed in a low temperature environment, and an amplifier chip 2. The quantum computing chip 1 includes a quantum bit 11 and a resonant cavity 12, an input terminal 13 connected to the resonant cavity 12, a first connection terminal 14 for connecting to the amplifier chip 2, and at least one first filter 15 disposed between the resonant cavity 12 and the first connection terminal 14; the amplifier chip 2 includes a second connection terminal 21 that can be connected to the first connection terminal 14, an output terminal 22, and at least one second filter 23, an amplifier 24, and at least one third filter 25 sequentially connected between the second connection terminal 21 and the output terminal 22.

[0050] The resonant cavity 12 of the quantum computing chip 1 can serve as a readout cavity, used to respond to the quantum computing input signal and obtain the quantum computing output signal carrying the resonant cavity and qubit information. The amplifier 24 amplifies the passing quantum computing signal under the action of an external pump source signal. Each filter, including a first filter 15, a second filter 23, and a third filter 25, is used to filter the passing quantum computing signal. Each filter includes multiple lumped-parameter resonant cavities connected in series, each with configurable filtering parameters. The filter is configured with two usable bandpasses that allow the valid quantum computing signal to pass through, and an attenuation section between the two usable bandpasses for attenuating the pump source signal. In practical applications, the filtering parameters of the multiple lumped-parameter resonant cavities can be configured to give the filter two usable bandpasses that allow the valid quantum computing signal to pass through, and an attenuation section between the two usable bandpasses for attenuating the pump source signal.

[0051] In some optional embodiments, the quantum computing device further includes at least one fourth filter 16 disposed between the input terminal 13 of the quantum computing chip 1 and the resonant cavity 12, for filtering the quantum computing input signal and then providing it to the resonant cavity 12.

[0052] In the aforementioned quantum computing device, the quantum computing chip 1 can respond to the quantum computing input signal to obtain a quantum computing output signal carrying information about the resonant cavity and qubits. Specifically, this is achieved through the resonant cavity 12 within the quantum computing chip. The resonant cavity 12 can be, for example, a type of resonant cavity. The quantum computing input signal is read into the resonant cavity 12 as an input signal, and after reflection and oscillation within the resonant cavity, it becomes a readout signal carrying information about the resonant cavity and qubits. The quantum computing result can be obtained by acquiring the readout signal. The quantum computing signals processed by the aforementioned filters can be either the quantum computing input signal or the quantum computing output signal after passing through the filter, depending on the position of the filter.

[0053] The aforementioned filters include a first filter 15, a second filter 23, a third filter 25, a fourth filter 16, etc. Each of these filters can include multiple lumped-parameter resonant cavities. The number of resonant cavities can be the same or different, depending on the specific design requirements. Generally, 4 to 8 lumped-parameter resonant cavities are connected in series. In practical applications, any number of 4, 5, 6, 7, or 8 lumped-parameter resonant cavities can be designed for series connection. Their physical dimensions are approximately 500x500µm, occupying very little space, and they offer advantages such as wide bandwidth and low loss.

[0054] The quantum computing chip 1 and amplifier chip 2 of the above-mentioned quantum computing device are both set in a low-temperature environment, while the pump source 3 can be set in a room-temperature environment.

[0055] Based on the same inventive concept, this utility model embodiment also provides a filter, the structure of which is as follows: Figure 4 As shown, the filter includes: multiple lumped-parameter resonant cavities 151 connected in series; the filter is used to filter quantum computing signals; the multiple lumped-parameter resonant cavities 151 have configurable filtering parameters, and the filter is configured with two available bandpasses that allow the effective quantum computing signal to pass through and an attenuation section between the two available bandpasses for attenuating the pump source signal. In practical applications, the filtering parameters of the multiple lumped-parameter resonant cavities 151 can be configured to make the filter have two available bandpasses that allow the effective quantum computing signal to pass through and an attenuation section between the two available bandpasses for attenuating the pump source signal.

[0056] The filter described above is a dual bandpass filter. The frequency range of its two usable bandpass segments is determined based on the effective frequency range of the quantum computing chip; the frequency range of the attenuation segment is determined based on the effective frequency range of the amplifier and the pump source.

[0057] The qubits in the aforementioned quantum computing chips include, but are not limited to, superconducting qubits, and amplifier chips include, but are not limited to, superconducting amplifier chips. Because the coupling of superconducting qubits with environmental noise affects their decoherence time, especially the noise from the cryogenic amplifier on the readout line, it degrades the performance of the qubits when used for computation. In existing technologies, such as... Figure 1 As shown, after the filter removes noise, both ends of the amplifier need to be isolated using separate circulators. In this application, the structure of the filter is improved by designing the filter as a structure of multiple lumped parameter resonant cavities connected in series and integrating the filter into the chip. By using the integrated design of the chip-side bandpass filter, the filter is integrated into the quantum computing chip and the amplifier chip, which can be fabricated on the same layout or in the same fabrication process. This can protect bit coherence in the most space-saving and hardware-cost-efficient way and reduce the hardware and space costs of the read link.

[0058] Previously, filters were like this Figure 2 The structural design shown primarily targets attenuation at 44GHz for the qubits, filtering out low-frequency noise. However, it cannot filter out pump source noise. Since the pump source generates a relatively strong signal that reaches saturation after amplification, this noise also needs to be filtered out. Existing filters cannot eliminate this noise, circulators need to be placed at both ends of the amplifier for protection. This isolation from the quantum chip is necessary to prevent signal feedback from affecting the quantum chip, while also providing isolation at the output end to avoid impacting downstream components.

[0059] The filter in the quantum computing device described in this application can filter out low-frequency noise below 6 gigabits and noise caused by the pump source. By setting a filter before the output of the quantum computing chip, the output signal of the quantum computing chip is filtered to ensure the validity of the signal. By integrating the filter at both ends of the amplifier, the pump source signal noise is filtered out. This structure achieves the dual functions of reading and writing protection for the quantum chip and filtering out pump source noise through the filter. The dual functions are combined and integrated into the design, thereby greatly reducing the space occupation.

[0060] The cryogenic components in existing quantum computing devices are typically tens of centimeters in physical scale, which is a very large device in quantum computing devices. Through the integrated design of this application, a dual bandpass filter including multiple lumped parameter resonant cavities is used to achieve filtering and isolation functions. Since the filter can be integrated on the chip, the physical size of the cryogenic component can be reduced to hundreds of micrometers, which greatly reduces hardware and space occupation costs and improves the utilization efficiency of physical space in cryogenic environments.

[0061] The lower limit of the usable bandpass frequency range of the two bandpass segments of the filter is no greater than 6 GHz and the upper limit is no less than 8 GHz. The length of the attenuation segment in the middle of the two usable bandpass segments is 50~200 MHz, and the lower limit of the frequency range of the attenuation segment is no less than 6.9 GHz and the upper limit is no greater than 7.1 GHz. The signal attenuation amplitude is greater than 30 dB.

[0062] Optionally, the two available bandpass frequency ranges are 6.5~6.9 GHz and 7.1~7.5 GHz, respectively; the attenuation frequency range is 6.9~7.1 GHz, with a signal attenuation amplitude of 30dB~40dB.

[0063] Optionally, the filter includes multiple cascaded lumped-parameter resonators, such as chip-side lumped-parameter resonators. The intrinsic frequency of these lumped-parameter resonators is designed to be 6.9~7.1 GHz. The coupling strength between these multiple cascaded lumped-parameter resonators is adjusted to form an attenuation section of a certain length near the intrinsic frequency. By adjusting the coupling strength between the resonators, signal attenuation at the intrinsic frequency can be achieved, thus ensuring the filter has the required attenuation section. Furthermore, by changing the coupling strength between the resonators, attenuation sections of different lengths can be formed near the intrinsic frequency, thereby achieving the goal of adjusting the length of the attenuation section as needed.

[0064] This invention utilizes four cascaded chip-side lumped-parameter resonant cavities. Through parameter design and adjustment, a Purcell filter with two usable bandpasses totaling 800 MHz within the 6.5 to 7.5 GHz range is achieved. Within the interval between the two bandpasses, there is an attenuation of greater than 30 dB within 50 MHz near 7 GHz. Readout signals used in quantum computing are often distributed between 6 and 8 GHz. Considering that the effective amplification bandpass of the parametric amplifier is concentrated around the pump source, the pump source is often set near 7 GHz. Therefore, after passing through the dual-band filter, there will be a 30 dB to 40 dB attenuation at the 7 GHz pump, while signals located at 6.5 to 6.9 GHz or 7.1 to 7.5 GHz can pass through. Simultaneously, this filter can be deployed on quantum computing chips, acting as a Purcell filter to protect bit coherence time while allowing fast bit readout, reducing reliance on additional microwave devices. This filter effectively integrates the functions of filtering the pump source and the Purcell filter.

[0065] Figure 5 This is an example graph showing the measurement results of the scattering parameters (S21 parameters) of the aforementioned dual bandpass filter. The horizontal axis represents frequency, and the vertical axis represents the S21 parameters. Scattering parameters generally characterize the power ratio of the output signal to the input signal. This filter is a superconducting dual bandpass filter fabricated and characterized using aluminum on a sapphire substrate. Figure 5 As can be seen from the measurement results of the S21 parameter of the filter, there is a clear bandpass range in the 6 to 8 GHz range. Figure 6 for Figure 5 A magnified view of the mid-band passband. It shows the dual-band passbands at 6.4–6.9 GHz and 7.1–7.4 GHz, as well as the bandstop centered at 7.05 GHz.

[0066] Based on the same inventive concept, this utility model provides a quantum computing signal processing method, the flow of which is as follows: Figure 7 As shown, it includes the following steps:

[0067] Step S11: The qubit resonant cavity in the quantum computing chip responds to the quantum computing input signal to obtain a quantum computing output signal carrying the information of the resonant cavity and the qubit.

[0068] After the input signal is input from the input terminal of the quantum computing chip, it is reflected and oscillated by the resonant cavity, so that the signal carries the resonant cavity information and the quantum bit information, and the quantum computing output signal carrying the resonant cavity and quantum bit information is obtained. The output signal can be read in the resonant cavity.

[0069] Step S12: The first filter filters the quantum computing signal output from the quantum bit resonant cavity and then provides it to the amplifier chip.

[0070] The first filter can filter out noise from the quantum computing signal. Since the signal is relatively weak, it needs to be amplified by an amplifier chip.

[0071] Step S13: The second filter in the amplifier chip filters the quantum computing signal and then provides it to the amplifier.

[0072] Step S14: The amplifier amplifies the quantum computing signal under the action of the external pump source signal, and outputs it after filtering by the third filter.

[0073] When an amplifier amplifies a signal, it requires a pump source signal as an excitation signal. Under the action of the pump source signal, even weak quantum computing signals can be amplified. The amplifier chip integrates at least one filter at each end of the amplifier. While filtering the quantum computing signal, a second filter prevents noise from the quantum computing signal from feeding back to the front end and affecting the quantum computing chip. A third filter prevents noise from the amplified quantum computing signal from affecting subsequent devices at the back end.

[0074] The first filter, the second filter, and the third filter all include multiple lumped parameter resonant cavities connected in series. By configuring the filtering parameters of the multiple lumped parameter resonant cavities, the filter has two available bandpasses that allow effective quantum computing signals to pass through, and an attenuation band between the two available bandpasses for attenuating and filtering pump source signals.

[0075] In the above method, the two available bandpass frequency ranges are determined based on the effective frequency range of the quantum computing chip; the frequency range of the attenuation range is determined based on the effective frequency range of the amplifier and the pump source.

[0076] In some optional embodiments, the above method further includes: filtering the quantum computing input signal and providing it to the resonant cavity by means of at least one fourth filter disposed between the quantum computing chip input terminal and the resonant cavity.

[0077] Regarding the devices and methods in the above embodiments, the specific manner in which each module or step performs its operations has been described in detail in one part of the embodiments, and will not be elaborated in detail in another part.

[0078] Unless otherwise specifically stated, terms such as processing, calculation, operation, determination, display, etc., may refer to the actions and / or processes of one or more processing or computing systems or similar devices that represent the manipulation and conversion of data representing physical (e.g., electronic) quantities within the registers or memory of the processing system into other data similarly representing physical quantities within the memory, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0079] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to the specific order or hierarchy described.

[0080] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0081] Those skilled in the art will also understand that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments herein can be implemented as electronic hardware, computer software, or a combination thereof. To clearly illustrate the interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps described above are generally described in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art can implement the described functionality in alternative ways for each specific application; however, such implementation decisions should not be construed as departing from the scope of this disclosure.

[0082] The steps of the methods or algorithms described in conjunction with the embodiments herein can be directly embodied in hardware, software modules executed by a processor, or a combination thereof. The software modules can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user terminal. Alternatively, the processor and storage medium can exist as discrete components in the user terminal.

[0083] For software implementation, the techniques described in this application can be implemented using modules (e.g., procedures, functions, etc.) that perform the functions described in this application. This software code can be stored in memory units and executed by a processor. The memory units can be implemented within the processor or outside the processor; in the latter case, they are communicatively coupled to the processor via various means, as is well known in the art.

[0084] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

Claims

1. A quantum computing device, characterized in that, include: Pump sources set up in a room temperature environment, and quantum computing chips and amplifier chips set up in a low temperature environment; The quantum computing chip includes qubits and a resonant cavity, an input terminal connected to the resonant cavity and a first connection terminal for connecting an amplifier chip, and at least one first filter disposed between the resonant cavity and the first connection terminal; the amplifier chip includes a second connection terminal that can be connected to the first connection terminal, an output terminal, and at least one second filter, an amplifier and at least one third filter connected in sequence between the two. The resonant cavity of the quantum computing chip is used to respond to the quantum computing input signal and obtain the quantum computing output signal carrying the information of the resonant cavity and the qubit. The amplifier is used to amplify the passing quantum computing signal under the action of the pump source signal; Each filter is used to filter the passing quantum computing signal; each filter includes multiple lumped parameter resonators connected in series, the multiple lumped parameter resonators have configurable filtering parameters, and the filter is configured with two available bandpasses that allow the effective quantum computing signal to pass through and an attenuation section between the two available bandpasses for attenuating and filtering the pump source signal.

2. The quantum computing device as described in claim 1, characterized in that, Also includes: At least one fourth filter is disposed between the input terminal of the quantum computing chip and the resonant cavity, for filtering the quantum computing input signal and then providing it to the resonant cavity.

3. The quantum computing device as described in claim 1, characterized in that, The frequency ranges of the two available bandpass segments are determined based on the effective frequency range of the quantum computing chip; the frequency range of the attenuation segment is determined based on the effective frequency range of the amplifier and the pump source.

4. The quantum computing device as described in claim 1, characterized in that, The lower limit of the frequency range of the two available bandpass bands is no greater than 6 GHz and the upper limit is no less than 8 GHz. The length of the attenuation band between the two available bandpass bands is 50~200 MHz, and the lower limit of the frequency range of the attenuation band is no less than 6.9 GHz and the upper limit is no greater than 7.1 GHz. The signal attenuation amplitude is greater than 30 dB.

5. The quantum computing device as described in claim 1, characterized in that, The two available bandpass frequency ranges are 6.5~6.9 GHz and 7.1~7.5 GHz, respectively. The frequency range of the attenuation band is 6.9~7.1 GHz, and the signal attenuation is 30dB~40dB.

6. The quantum computing device as described in claim 1, characterized in that, The number of lumped parameter resonant cavities connected in series is 4-8.

7. The quantum computing device as described in claim 1, characterized in that, The filter includes multiple lumped-parameter resonators connected in series, the eigenfrequency of which is designed to be 6.9 to 7.1 GHz, and the multiple lumped-parameter resonators connected in series are configured such that the coupling strength between the resonators is adjustable to form the attenuation band near the eigenfrequency.

8. A filter, characterized in that, include: Multiple lumped-parameter resonant cavities connected in series; The filter is used to filter quantum computing signals; the plurality of lumped parameter resonant cavities have configurable filtering parameters, and the filter is configured with two available bandpasses that allow valid quantum computing signals to pass through and an attenuation band between the two available bandpasses for attenuating and filtering pump source signals.

9. The filter as described in claim 8, characterized in that, The frequency ranges of the two available bandpass segments are determined based on the effective frequency range of the quantum computing chip; the frequency range of the attenuation segment is determined based on the effective frequency range of the amplifier and the pump source.

10. The filter as described in claim 8, characterized in that, The number of lumped parameter resonant cavities connected in series is 4-8.

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