CN118040431A - Microwave signal generating device - Google Patents
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Abstract
Disclosed herein is a microwave signal generating apparatus including: the device comprises a microwave resonant cavity, a superconducting quantum interferometer chain and a magnetic flux control unit; the superconducting quantum interferometer chain is positioned in a microwave resonant cavity, the microwave resonant cavity is used for generating microwave signals with preset fundamental frequency, and the magnetic flux control unit is a first preset distance away from the superconducting quantum interferometer chain and is used for acting a generated magnetic field on the superconducting quantum interferometer chain and controlling magnetic flux passing through the superconducting quantum interferometer chain so as to output the microwave signals generated in the microwave resonant cavity in a preset form; wherein the superconducting quantum interferometer chain is composed of more than one superconducting quantum interferometers; the preset form includes a pulse form or a continuous form. The embodiment of the invention realizes the generation of microwave signals through a simple circuit structure and provides technical support for the scale expansion of a quantum computing system.
Description
Technical Field
The present disclosure relates to signal processing technology, and more particularly to a microwave signal generating device.
Background
The low-temperature microwave signal source refers to a microwave signal generating device operating at a low temperature. Low temperature microwave signal sources have important applications in many areas; for example, a high-stability low-phase noise frequency source can be realized based on a low-temperature high-quality factor superconducting microwave resonant cavity, and the high-stability low-phase noise frequency source is used in the fields of measurement and control, guidance, communication, accurate positioning and the like; the low-temperature microwave signal source assembled in the dilution refrigerator can directly provide microwave drive for the superconducting quantum chip or the semiconductor quantum chip, is hopeful to solve the heat load problem and the wiring problem in a large-scale quantum computer based on a superconducting circuit or a semiconductor quantum structure, and promotes the scale expansion of a quantum computing system.
At present, controllable low-temperature microwave signal sources mainly have two implementation modes: 1. generating ultra-fast pulse based on the superconducting single magnetic flux quantum circuit, and generating a low-temperature microwave signal through filtering and shaping; 2. based on the direct current Josephson effect, the low temperature microwave signal is realized by applying direct current bias voltages at two ends of the Josephson node. The first method cannot directly generate low-temperature microwave signals, and requires additional signal processing; and the single magnetic flux quantum circuit has a complex structure, and the design and the preparation of related devices have the problem of higher threshold. The second method can only generate continuous signals, and the generated low-temperature microwave signals have poor phase stability. In addition, the low-temperature semiconductor integrated circuit can also be used for realizing phase and amplitude modulation on the input local oscillator and generating a specific low-temperature microwave signal, but the low-temperature semiconductor integrated circuit has the unavoidable heating problem and can put additional demands on the refrigerating power of a low-temperature system.
In summary, the generation of the low-temperature microwave signal in the related art has the problems of complex circuit structure, large design difficulty, poor stability or heat generation, and the like, and how to obtain a stable low-temperature pulse signal becomes a problem to be solved.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a microwave signal generating device which can generate a stable low-temperature pulse signal through a simple circuit structure.
The embodiment of the invention provides a microwave signal generating device, which comprises: a microwave resonant cavity 1, a superconducting quantum interferometer chain 2 and a magnetic flux control unit chain 3; wherein,
A superconducting quantum interferometer chain 2 is arranged in the microwave resonant cavity 1 and is used for providing a fundamental frequency for generating microwave signals;
the magnetic flux control unit 3 is a first preset distance away from the superconducting quantum interferometer chain 2, and is used for acting a generated magnetic field on the superconducting quantum interferometer chain 2 and controlling the magnetic flux of the superconducting quantum interferometer chain 2 so as to output a microwave signal generated in the microwave resonant cavity 1 in a preset form;
Wherein the superconducting quantum interferometer chain 2 is composed of more than one superconducting quantum interferometer; the preset form comprises: pulse form or continuous form.
In an exemplary embodiment, the microwave signal generating apparatus further includes: a signal deriving unit 4 for deriving the microwave signal.
In one illustrative example, the superconducting quantum interferometer chain 2 is one of any of the following structures:
is composed of one superconducting quantum interferometer;
the superconducting quantum interferometer is formed by connecting more than two superconducting quantum interferometers in series;
the superconducting quantum interferometer is formed by connecting more than two superconducting quantum interferometers in parallel;
The superconducting quantum interferometers are formed by connecting more than three superconducting quantum interferometers in a preset series and parallel mode.
In an illustrative example, the microwave cavity 1 includes: the coplanar microwave resonant cavity consists of a central conductor 1-1 and a grounding layer 1-2, wherein the central conductor 1-1 is connected with the superconducting quantum interferometer chain 2.
In one illustrative example, the material of the center conductor 1-1 and the ground layer 1-2 is a superconducting material.
In an illustrative example, the signal deriving unit 4 is a second preset distance from the central conductor 1-1.
In an illustrative example, the signal deriving unit 4 is a coplanar waveguide structure.
In an exemplary embodiment, the magnetic flux control unit 3 controls the conversion rate of the magnetic flux to be converted to be greater than a preset conversion rate threshold.
In an illustrative example, the magnetic flux control unit 3 includes: a current source 3-1 and a current path 3-2;
The current source 3-1 is used for outputting a current with a predetermined change rate larger than a preset change rate threshold value, and adjusting the form of an output current according to a preset form, wherein the form of the output current is used for controlling an output microwave signal to be in a pulse form or a continuous form;
The current path 3-2 is used for generating a magnetic field acting on the superconducting quantum interferometer chain 2 according to the current output by the current source 3-1 so as to control the magnetic flux passing through the superconducting quantum interferometer chain 2.
In an illustrative example, the magnetic flux control unit controls magnetic flux of superconducting quantum interferometer chain 2, including:
Applying a magnetic flux in a step form to the superconducting quantum interferometer chain 2 to output a microwave signal in a pulse form;
The energy of the pulse-shaped microwave signal is determined by the magnetic flux change rate of the magnetic flux, the phase of the pulse-shaped microwave signal is determined by the initial magnetic flux intensity of the step signal, and the frequency of the pulse-shaped microwave signal is determined by the final magnetic flux intensity of the step signal.
In an illustrative example, the magnetic flux control unit controls magnetic flux of superconducting quantum interferometer chain 2, including:
a magnetic flux in the form of pulses is applied to the superconducting quantum interferometer chain 2 to output a microwave signal in a continuous form.
The technical scheme of the application comprises the following steps: the device comprises a microwave resonant cavity, a superconducting quantum interferometer chain and a magnetic flux control unit; the superconducting quantum interferometer chain is positioned in a microwave resonant cavity, the microwave resonant cavity is used for generating microwave signals with preset fundamental frequency, and the magnetic flux control unit is a first preset distance away from the superconducting quantum interferometer chain and is used for acting a generated magnetic field on the superconducting quantum interferometer chain and controlling magnetic flux passing through the superconducting quantum interferometer chain so as to output the microwave signals generated in the microwave resonant cavity in a preset form; wherein the superconducting quantum interferometer chain is composed of more than one superconducting quantum interferometers; the preset form includes a pulse form or a continuous form. The embodiment of the application realizes the generation of microwave signals through a simple circuit structure and provides technical support for the scale expansion of a quantum computing system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a flow chart of a microwave signal generating apparatus according to an embodiment of the invention;
FIG. 2 is a schematic circuit diagram of a microwave signal generating apparatus according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention applying a current signal in the form of a step;
FIG. 4 is a schematic diagram of a current signal applied in pulse form according to an embodiment of the present invention;
FIG. 5 is a schematic waveform diagram of a microwave signal in the time domain according to an embodiment of the present invention;
FIG. 6 is a graph showing the Fourier transform spectrum of a microwave signal according to the embodiment of the invention as a function of the final value of the current;
FIG. 7 is a graph showing the intensity variation of a microwave signal according to the present invention;
FIG. 8 is a schematic diagram showing the phase change of a microwave signal according to an embodiment of the present invention;
Fig. 9 is a schematic diagram illustrating a phase change of another microwave signal according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.
Fig. 1 is a flowchart of a microwave signal generating apparatus according to an embodiment of the invention, as shown in fig. 1, including: a microwave resonant cavity 1, a superconducting quantum interferometer chain 2 and a magnetic flux control unit 3; wherein,
A superconducting quantum interferometer chain 2 is arranged in the microwave resonant cavity 1 and is used for providing a microwave signal for generating a preset fundamental frequency;
the magnetic flux control unit 3 is a first preset distance away from the superconducting quantum interferometer chain 2, and is used for acting a generated magnetic field on the superconducting quantum interferometer chain 2 and controlling the magnetic flux of the superconducting quantum interferometer chain 2 so as to output a microwave signal generated in the microwave resonant cavity 1 in a preset form;
wherein the superconducting quantum interferometer chain 2 is composed of more than one superconducting quantum interferometer; the preset form comprises the following steps: pulse form or continuous form.
In an exemplary embodiment, the preset fundamental frequency is the operating frequency of the microwave cavity 1.
The embodiment of the invention realizes the generation of the microwave signals in a continuous form or a pulse form through a simple circuit structure and provides technical support for the scale expansion of a quantum computing system.
In an exemplary embodiment, the microwave signal generating device is located in a low-temperature environment and is used for ensuring normal operation of a superconducting quantum interferometer chain and generating a low-temperature pulse signal.
According to the embodiment of the invention, the magnetic field generated by the magnetic flux control unit 3 is B, and the magnetic flux phi passing through the superconducting quantum interferometer chain 2 is rapidly regulated by the rapidly-changing magnetic field B; in one illustrative example, the relationship of magnetic flux Φ to magnetic field B of an embodiment of the present invention satisfies Φ= c BdS, where cs represents the integral over the loop area of superconducting quantum interferometer chain 2. In an illustrative example, the above-mentioned fundamental frequency f can be adjusted according to the capacitance C and inductance L of the microwave cavity 1,Where L j represents the inductance of the superconducting interferometer chain 2. In an exemplary embodiment, the resonant cavity is a coplanar microwave resonant cavity, and when the resonant cavity is formed by a ground layer and a central conductor, the adjustment of the capacitance C and inductance L of the resonant cavity can be achieved by adjusting the length of the central conductor, so that the adjustment of the fundamental frequency is achieved.
In an illustrative example, the microwave cavity 1 in the embodiment of the present invention may include any of the following types of cavities: coplanar microwave resonant cavity, lumped element microwave resonant cavity, microstrip microwave resonant cavity, etc. In an illustrative example, the microwave cavity 1 in the embodiment of the present invention may be another cavity that can provide the above fundamental frequency.
The magnetic flux Φ in the embodiment of the invention is equal to the integral of the magnetic field strength B at the position of the superconducting quantum interferometer chain 2 in the area range of the superconducting quantum interferometer chain 2: phi = BdS.
In one illustrative example, superconducting quantum interferometer chain 2 in an embodiment of the present invention is one of any of the following structures:
is composed of a superconducting quantum interferometer;
the device is formed by connecting more than two superconducting quantum interferometers in series;
The device is formed by connecting more than two superconducting quantum interferometers in parallel;
The superconducting quantum interferometers are formed by connecting more than three superconducting quantum interferometers in a preset series and parallel mode.
In one illustrative example, the predetermined series and parallel arrangement may be analytically set by one skilled in the art.
In an illustrative example, superconducting quantum interferometer chain 2 of the present embodiment is a closed loop of superconducting material comprising two josephson junctions, well known to those skilled in the art; the josephson junction comprises two superconducting layers and an intermediate insulating layer.
The embodiment of the invention realizes the generation of microwave signals through a simple circuit structure and provides technical support for the scale expansion of a quantum computing system.
In an illustrative example, the microwave cavity 1 of the embodiment of the present invention includes: the coplanar microwave resonant cavity consists of a central conductor 1-1 and a grounding layer 1-2, wherein the central conductor 1-1 is connected with a superconducting quantum interferometer chain 2.
In one illustrative example, the materials of the center conductor 1-1 and the ground layer 1-2 of the embodiment of the present invention are superconducting materials. The efficiency of microwave signal generation is improved by the central conductor 1-1 and the ground layer 1-2 of the superconducting material.
In an exemplary embodiment, the microwave signal generating apparatus according to an embodiment of the present invention further includes: a signal deriving unit 4 for deriving the microwave signal.
In an illustrative example, the signal deriving unit 4 in the embodiment of the present invention may be other elements or structures that can implement microwave signal derivation, such as a coplanar waveguide structure or a coaxial cable.
In one illustrative example, the signal deriving unit 4 of the present embodiment is a second predetermined distance from the center conductor 1-1.
In an exemplary embodiment, the second preset distance is determined according to the required duration of the pulse microwave signal, and may be obtained through numerical simulation. The distance of the signal deriving unit 4 from the central conductor 1-1 determines the coupling strength of both, and a specific value can be obtained by numerical simulation. The coupling strength of the signal deriving unit 4 to the central conductor 1-1 determines the time required for the microwave photons generated in the microwave cavity 1 to emerge from the signal deriving unit 4 in the form of pulses.
In an exemplary embodiment of the present invention, the length of the central conductor 1-1 is set according to the wavelength of the microwave signal to be output, where the length of the central conductor 1-1 is a half integer multiple of the wavelength of the microwave signal, for example, 1/2 or 3/2, and the specific multiple may be determined according to the capacitance L and the inductance C of the microwave resonant cavity; in one illustrative example, the resonant frequency of the microwave cavityWhere L j is the inductance of superconducting quantum interferometer chain 2. In one illustrative example, superconducting quantum interferometer chain 2 of the present embodiment provides inductance L j of a portion of the microwave cavity; furthermore, the inductance L j of the superconducting quantum interferometer chain 2 can be adjusted by the magnetic flux control unit 3, thereby controlling the fundamental frequency f at which the microwave signal is generated.
In an illustrative example, the distance between the center conductor 1-1 and the ground layer 1-2 of the embodiment of the present invention may be determined according to a predetermined impedance of the chip substrate material and the microwave device of the microwave signal generating apparatus; in an illustrative example, the distance between the center conductor 1-1 and the ground layer 1-2 of an embodiment of the present invention depends on the characteristic impedance of the desired microwave circuit, and can be determined by numerical simulation.
In an illustrative example, the magnetic flux control unit 3 of the embodiment of the present invention controls the conversion rate of the magnetic flux to be converted to be larger than a preset conversion rate threshold value; by controlling the conversion rate of the magnetic flux change, the generation of the microwave signal can be controlled.
The microwave signal output by the coplanar waveguide can be directly used at low temperature or can be guided out to room temperature through the vacuum through device for use; in one illustrative example, after the microwave signal is generated by an embodiment of the present invention, the microwave signal may be output to an external circuit by coupling the microwave signal to a coplanar waveguide.
According to the embodiment of the invention, the current source 3-1 outputs a current signal in a step form or a pulse form, so that the rapid change of magnetic flux through the superconducting quantum interferometer chain 2 is realized.
In an illustrative example, the magnetic flux control unit 3 of the embodiment of the present invention includes: a current source 3-1 and a current path 3-2; the current source 3-1 is used for outputting a current with a predetermined change rate larger than a preset change rate threshold value, and adjusting the form of the output current according to a preset form, wherein the form of the output current is used for controlling the output microwave signal to be in a pulse form or a continuous form; the current path 3-2 is used to generate a magnetic field acting on the superconducting quantum interferometer chain 2 according to the current outputted from the current source 3-1 to control the magnetic flux passing through the superconducting quantum interferometer chain 2. The current source 3-1 is used for outputting a rapid change current in a step form or a pulse form, and the current path 3-2 is used for rapidly changing the magnetic field of the position of the superconducting quantum interferometer chain 2 in the step form or the pulse form according to the current output by the current source 3-1 so as to realize rapid change of the magnetic flux passing through the superconducting quantum interferometer chain 2 in the step form or the pulse form.
According to the embodiment of the invention, the fast changing current signal is obtained by adjusting the transformation rate threshold value of the current source 3-1, so that the fast change of the magnetic flux of the superconducting quantum interferometer chain 2 is realized.
Fig. 2 is a schematic circuit diagram of a microwave signal generating apparatus according to an embodiment of the invention, as shown in fig. 2, including: a microwave resonant cavity 1, a superconducting quantum interferometer chain 2, a magnetic flux control unit 3 and a coplanar waveguide 4 (signal deriving unit) for deriving a microwave signal; the microwave signal generating device is positioned in a low-temperature environment and used for ensuring the normal operation of the superconducting quantum interferometer chain, wherein the microwave resonant cavity 1 consists of a central conductor 1-1 and a grounding layer 1-2, and the magnetic flux control unit 3 consists of a current source 3-1 and a current path 3-2 and is used for controlling the magnetic flux passing through the superconducting quantum interferometer chain 2.
In an exemplary embodiment, the microwave signal generating apparatus according to the embodiment of the present invention may be installed in a refrigeration apparatus, such as a dilution refrigerator, and cooled below a critical temperature of a superconducting material used. The current source 3-1 may be placed at room temperature and a current signal may be transmitted to the current path 3-2 by means of a vacuum penetration or the like. The microwave signal output from coplanar waveguide 4 may be used directly at low temperature or may be conducted out to room temperature through a vacuum feedthrough. The rapid change of the magnetic flux through the superconducting quantum interferometer chain 2 can generate a microwave signal in the coplanar microwave resonant cavity 1, which is coupled to the coplanar waveguide 4 for output to an external circuit. The rapid change in magnetic flux of superconducting quantum interferometer chain 2 may be achieved by applying a rapidly changing current on current path 3-2, applying a rapid rising edge current signal as shown in fig. 3, or applying a pulsed current signal as shown in fig. 4.
In one illustrative example, microwave signal generation in accordance with embodiments of the present invention requires only a rapidly varying signal, the rapidly varying form of the current including, but not limited to, rising edges, falling edges, pulses, and the like. The microwave signal in the form of pulses is generated at the moment of the rapid change of the control current signal.
In an illustrative example, according to a specific form of a single pulse of the microwave signal in the time domain, the generated microwave signal is amplified and then down-converted from a frequency of about 5 ghz to a frequency of about 100 mhz by means of a device including a mixer, resulting in a time domain signal as shown in fig. 5.
In an illustrative example, the magnetic flux control unit of the embodiment of the present invention controls the magnetic flux of the superconducting quantum interferometer chain 2, including:
Applying magnetic flux in a step form to the superconducting quantum interferometer chain 2 to output microwave signals in a pulse form;
Wherein the energy of the microwave signal in the form of pulse is determined by the flux change rate of the magnetic flux, the phase of the microwave signal in the form of pulse is determined by the initial flux intensity of the step signal, and the frequency of the microwave signal in the form of pulse is determined by the final flux intensity of the step signal; here, the step signal refers to a signal used for generating a magnetic flux in a step form.
In an illustrative example, the magnetic flux control unit of the embodiment of the present invention controls the magnetic flux of the superconducting quantum interferometer chain 2, including:
a magnetic flux in the form of pulses is applied to the superconducting quantum interferometer chain 2 to output a microwave signal in a continuous form.
In an exemplary embodiment, the microwave signal is determined by the resonant frequency f of the microwave resonant cavity 1, and the resonant frequency f of the microwave resonant cavity 1 is affected by the inductance of the superconducting quantum interferometer chain 2, so that the inductance can be adjusted by adjusting the magnetic flux passing through the superconducting quantum interferometer chain 2, and further the adjustment of the resonant frequency of the microwave resonant cavity 1 and the frequency of the emergent microwave signal is realized
In an illustrative example, embodiments of the present invention generate a microwave signal in the form of pulses by applying a stepped current signal, the phase of which may be controlled by varying I 1; the frequency of generating the microwave signal can be controlled by changing I 2; the intensity of the generated microwave signal can be controlled by adjusting the rate of current change.
In an illustrative example, when the microwave signal of the embodiment of the present invention is generated in the rapid current change (between the time t 1 and the time t 2) shown in fig. 3, referring to fig. 6, the eigenfrequency of the microwave cavity 1, and thus the frequency of the generated microwave signal, can be controlled by adjusting the value of I 2; the embodiment of the invention generates the change of the Fourier transform spectrum of the microwave signal along with the externally applied I 2, and after the generated microwave signal is amplified and frequency-down converted to the vicinity of 100 MHz, the time domain signal is Fourier transformed; the position of the signal line on the horizontal axis in the figure varies with the applied current, indicating the frequency shift of the generated microwave signal. In an illustrative example, embodiments of the present invention may adjust the intensity of the generated microwave signal by varying the rate of change of the current signal, such as by adjusting the slope of the current change (I 2-I1)/(t2-t1) between times t 1 and t 2 in fig. 3. Fig. 7 shows that given I 2 and I 1 in the experiment, the intensity of the generated microwave signal changes with the selection of different (t 2-t1) values, and the embodiment of the invention realizes the controllable output of the intensity of the microwave signal by adjusting (t 2-t1), and when I 1 and I 2 are fixed, the intensity of the generated microwave signal decreases with the increase of (t 2-t1). The initial phase of the generated microwave signal is related to I 1, and continuous adjustment of the phase of the generated microwave signal can be realized by selecting different I 1 values; in one illustrative example, the values of the primary phases of embodiments of the present invention may be derived from the fourier transform results of the generated microwave signal; referring to fig. 8 and 9, embodiments of the present invention fix the values of I 2、t1 and t 2, by continuously varying I 1, a microwave signal with continuously varying phase is generated.
In one illustrative example, embodiments of the present invention may generate a continuous microwave signal by applying a current signal in the form of pulses; when the current source 3-1 outputs a current signal in a pulse form, a magnetic flux change in a pulse form can be generated at the position of the superconducting quantum interferometer chain 2 through the current path 3-2, and a pulse microwave signal in a pulse form can be generated at the corresponding moment of each magnetic flux pulse. Referring to fig. 4, when the time interval between the current pulses is smaller than the duration of the microwave pulse signal, a continuous form of microwave signal can be emitted from the coplanar waveguide 4, and the frequency of the microwave signal is determined by the back substrate I p1 of the current pulse.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (11)
1. A microwave signal generating apparatus comprising: a microwave resonant cavity (1), a superconducting quantum interferometer chain (2) and a magnetic flux control unit (3); wherein,
A superconducting quantum interferometer chain (2) is arranged in the microwave resonant cavity (1) and is used for generating microwave signals with preset fundamental frequency;
The magnetic flux control unit (3) is a first preset distance away from the superconducting quantum interferometer chain (2) and is used for acting a generated magnetic field on the superconducting quantum interferometer chain (2) and controlling the magnetic flux of the superconducting quantum interferometer chain (2) so as to output microwave signals generated in the microwave resonant cavity (1) in a preset form;
wherein the superconducting quantum interferometer chain (2) is composed of more than one superconducting quantum interferometer; the preset form comprises: pulse form or continuous form.
2. The microwave signal generating apparatus according to claim 1, further comprising: a signal deriving unit (4) for deriving the microwave signal.
3. The microwave signal generating device according to claim 1, characterized in that the superconducting quantum interferometer chain (2) is one of the following structures:
is composed of one superconducting quantum interferometer;
the superconducting quantum interferometer is formed by connecting more than two superconducting quantum interferometers in series;
the superconducting quantum interferometer is formed by connecting more than two superconducting quantum interferometers in parallel;
The superconducting quantum interferometers are formed by connecting more than three superconducting quantum interferometers in a preset series and parallel mode.
4. The microwave signal generating device according to claim 2, wherein the microwave cavity (1) comprises: the coplanar microwave resonant cavity consists of a central conductor (1-1) and a grounding layer (1-2), wherein the central conductor (1-1) is connected with the superconducting quantum interferometer chain (2).
5. A microwave signal generating device according to claim 4, characterized in that the material of the central conductor (1-1) and the ground layer (1-2) is a superconducting material.
6. A microwave signal generating device according to claim 4, characterized in that the signal deriving unit (4) is a second preset distance from the central conductor (1-1).
7. A microwave signal generating device according to claim 2, 4,5 or 6, characterized in that the signal deriving unit (4) is a coplanar waveguide structure.
8. A microwave signal generating device according to any one of claims 1-6, characterized in that the magnetic flux control unit (3) controls the conversion rate of the magnetic flux to be larger than a preset conversion rate threshold value.
9. The microwave signal generating device according to claim 8, wherein the magnetic flux control unit (3) includes: a current source (3-1) and a current path (3-2);
The current source (3-1) is used for outputting a current with a predetermined change rate larger than a preset change rate threshold value, and adjusting the form of the output current according to a preset form, wherein the form of the output current is used for controlling the output microwave signal to be in the pulse form or the continuous form;
The current path (3-2) is used for generating a magnetic field acting on the superconducting quantum interferometer chain (2) according to the current output by the current source (3-1) so as to control the magnetic flux passing through the superconducting quantum interferometer chain (2).
10. A microwave signal generating device according to any one of claims 1-6, characterized in that the magnetic flux control unit controls the magnetic flux of the superconducting quantum interferometer chain (2), comprising:
-applying a magnetic flux in the form of a step to the superconducting quantum interferometer chain (2) to output a microwave signal in the form of a pulse;
The energy of the pulse-shaped microwave signal is determined by the magnetic flux change rate of the magnetic flux, the phase of the pulse-shaped microwave signal is determined by the initial magnetic flux intensity of the step signal, and the frequency of the pulse-shaped microwave signal is determined by the final magnetic flux intensity of the step signal.
11. A microwave signal generating device according to any one of claims 1-6, characterized in that the magnetic flux control unit controls the magnetic flux of the superconducting quantum interferometer chain (2), comprising:
-applying a magnetic flux in the form of pulses to the superconducting quantum interferometer chain (2) to output the microwave signal in continuous form.
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| CN202211419740.XA CN118040431A (en) | 2022-11-14 | 2022-11-14 | Microwave signal generating device |
| PCT/CN2023/119434 WO2024103952A1 (en) | 2022-11-14 | 2023-09-18 | Microwave signal generation apparatus |
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| CN202211419740.XA CN118040431A (en) | 2022-11-14 | 2022-11-14 | Microwave signal generating device |
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| CN202211419740.XA Pending CN118040431A (en) | 2022-11-14 | 2022-11-14 | Microwave signal generating device |
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| CN (1) | CN118040431A (en) |
| WO (1) | WO2024103952A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5062659B2 (en) * | 2006-10-26 | 2012-10-31 | 日本電気株式会社 | Read method for qubit device and read circuit for qubit device to which the read method is applied |
| JP5167504B2 (en) * | 2008-03-18 | 2013-03-21 | 日本電気株式会社 | Parametric amplifier |
| CN107393941B (en) * | 2017-08-11 | 2020-12-25 | 中国科学技术大学 | Low-temperature microwave source, low-temperature microwave source chip and manufacturing method thereof |
| JP6853141B2 (en) * | 2017-08-15 | 2021-03-31 | 日本電信電話株式会社 | Superconducting magnetic flux qubit controller |
| CN110120792A (en) * | 2019-06-17 | 2019-08-13 | 合肥本源量子计算科技有限责任公司 | A kind of quantum parameters amplifier |
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- 2022-11-14 CN CN202211419740.XA patent/CN118040431A/en active Pending
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| WO2024103952A1 (en) | 2024-05-23 |
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