CN115759273B - Signal processing circuit, quantum control system and quantum computer - Google Patents
Signal processing circuit, quantum control system and quantum computer Download PDFInfo
- Publication number
- CN115759273B CN115759273B CN202211431506.9A CN202211431506A CN115759273B CN 115759273 B CN115759273 B CN 115759273B CN 202211431506 A CN202211431506 A CN 202211431506A CN 115759273 B CN115759273 B CN 115759273B
- Authority
- CN
- China
- Prior art keywords
- signal
- switch
- module
- unit
- processing circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012545 processing Methods 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 230000003321 amplification Effects 0.000 claims abstract description 53
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 53
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims description 32
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 13
- 238000004891 communication Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002096 quantum dot Substances 0.000 description 2
- 230000026676 system process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005610 quantum mechanics Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Landscapes
- Microwave Amplifiers (AREA)
Abstract
The application belongs to the field of quanta, and discloses a signal processing circuit which is applied to a quanta measurement and control circuit and is used for amplifying a microwave signal carrying quantum state information output by a quanta processor, and the signal processing circuit comprises a power detection module and a signal amplifying link which are connected in sequence; the signal amplification link comprises a plurality of signal amplification paths which are gated by a switch, wherein the gains of the signal amplification paths are different; the power detection module controls the switch to be communicated with a signal amplification path to the signal output port according to the power of the microwave signal received by the signal input port. The signal processing circuit amplifies the microwave signals carrying the quantum state information output by the quantum processor by selecting the signal amplification paths with different gains, ensures that the power variation range of the microwave signals to be measured received by the measuring equipment is smaller, and improves the flexibility of the measuring equipment in measuring the microwave signals carrying the quantum state information output by the quantum processor.
Description
Technical Field
The application belongs to the field of quanta, and particularly relates to a signal processing circuit, a quanta control system and a quanta computer.
Background
The quantum computation is a novel computation mode for regulating and controlling basic information units to perform computation according to quantum mechanics rules. The basic information unit of the classical computation is a classical bit, the basic information unit of the quantum computation is a qubit, the classical bit can only be in one state, namely 0 or 1, and the state of the qubit can be in a superposition state of multiple possibilities based on the quantum mechanical state superposition principle, so that the computation efficiency of the quantum computation is far higher than that of the classical computation.
In a quantum computer, a quantum processor is integrated with multi-bit quantum bits, the quantum processor needs to work in an extremely low-temperature environment to obtain excellent working performance, and if the working environment is too high in temperature, the evolution of a quantum state is very difficult to control and read. The quantum processor is generally arranged on the lowest temperature layer of the dilution refrigerator, the measuring equipment is arranged outside the dilution refrigerator to measure the microwave signal carrying quantum state information output by the quantum processor, and the measuring equipment is connected with the quantum processor by adopting a measurement and control circuit. Because the microwave signals output by the quantum processor are weak, in order to enable the room-temperature measuring equipment to measure the microwave signals, a signal amplifying link is required to be arranged in the measurement and control circuit to amplify the microwave signals output by the quantum processor; the signal amplifying link comprises a low-temperature amplifying circuit in an extremely low-temperature environment and a low-noise amplifying circuit in a room-temperature environment, and the measuring equipment is connected with one end of the low-noise amplifying circuit in the room-temperature environment and is used for measuring the received microwave signals.
The calculation tasks executed by the qubits on the quantum processor are diversified, the power of the microwave signals output by the different qubits on the quantum processor is different, the power interval span is larger, the gain of the signal amplifying link in the prior art is fixed, therefore, the power variation range of the microwave signals to be measured output by the signal amplifying link received by the measuring equipment in the room temperature environment is also large, and the measuring equipment is difficult to measure.
Disclosure of Invention
The application aims to provide a signal processing circuit, a quantum control system and a quantum computer, which overcome the defect that the power variation range of a microwave signal output by a signal amplifying link is very large and difficult to measure in the prior art, and improve the flexibility of measuring equipment in measuring the microwave signal output by a quantum processor.
The technical scheme of the application is as follows:
the application provides a signal processing circuit which is applied to a quantum measurement and control circuit and is used for amplifying a microwave signal carrying quantum state information output by a quantum processor, and the signal processing circuit comprises a power detection module and a signal amplifying link which are connected in sequence;
the signal amplification link comprises a plurality of signal amplification paths which are gated by a switch, wherein the gains of the signal amplification paths are different;
the power detection module controls the switch to be communicated with a signal amplification path to the signal output port according to the power of the microwave signal received by the signal input port.
The signal processing circuit as described above, preferably, the signal amplifying link includes a first switch module and a second switch module, and a plurality of signal amplifying branches connected in parallel to the first switch module and the second switch module;
the fixed end of the first switch module is connected with the power detection module, and the fixed end of the second switch module is connected with the signal output port;
the input end and the output end of each signal amplifying branch are respectively connected with the movable ends of the first switch module and the second switch module one by one;
wherein the gain of each signal amplifying branch is different.
The signal processing circuit as described above, preferably, the signal amplifying branch includes a plurality of signal amplifying units connected in series.
The signal processing circuit as described above, preferably, the signal amplifying link includes a plurality of stages of signal amplifying units and a plurality of switch modules connected in series in sequence; the switch module is used for connecting the power detection module with the signal output port; or (b)
The input end is used for connecting the power detection module with each signal amplifying unit; or (b)
The input end and the output end are used for connecting the adjacent signal amplifying units; or (b)
And the signal amplifying unit is used for connecting the output end of each signal amplifying unit with the signal output port.
The signal processing circuit as described above, preferably, the switching module includes a first switching unit, a second switching unit, and a third switching unit;
the first switch unit is used for communicating the power detection module with the input end of the first-stage signal amplification unit or communicating the power detection module with the third switch unit;
the second switch unit is used for communicating the output end of the signal amplifying unit of the previous stage with the input end of the signal amplifying unit of the next stage or communicating the output end of the signal amplifying unit of the previous stage with the third switch unit;
the third switch unit is used for communicating the output end of the signal amplifying unit of the last stage with the signal output port or communicating the first switch unit with the signal output port or communicating the second switch unit with the signal output port.
In the signal processing circuit described above, preferably, each of the first switch unit, the second switch unit, and the third switch unit includes a plurality of single pole multiple throw switches.
The signal processing circuit as described above, preferably, the first switching unit includes at least one single pole double throw switch;
the fixed end of the single-pole double-throw switch is connected with the power detection module;
and the movable end of the single-pole double-throw switch is connected with the input end of the signal amplifying unit of the first stage or the third switch unit.
The signal processing circuit as described above, preferably, the second switch unit includes at least one first single-pole double-throw switch and a first multi-throw switch unit, wherein the first multi-throw switch unit includes two single-pole double-throw switches with stationary ends connected in series;
the fixed end of the first single-pole double-throw switch is connected with the output end of the signal amplifying unit of the previous stage, and the movable end of the first single-pole double-throw switch is respectively connected with the input end of the signal amplifying unit of the next stage and the movable end of the first multi-throw switch unit;
the movable end of the first multi-throw switch unit is respectively connected with the output end of the signal amplifying unit at the previous stage, the movable end of the first single-pole double-throw switch, the input end of the signal amplifying unit at the next stage and the third switch unit.
The signal processing circuit as described above, preferably, the third switch unit includes at least one single pole three throw switch or a second multi-throw switch unit, wherein the second multi-throw switch unit includes a single pole double throw switch with a movable end connected in series with a stationary end;
the fixed end of the single-pole three-throw switch and the fixed end of the second multi-throw switch unit are both connected with the signal output port, and the movable end of the single-pole three-throw switch and the movable end of the second multi-throw switch unit are both connected with the output end of the signal amplifying unit or the first switch unit or the second switch unit of the last stage.
The signal processing circuit as described above preferably further comprises an attenuation module with an adjustable attenuation value, wherein a first end of the attenuation module is connected to the third switch unit, and a second end of the attenuation module is connected to the signal output port.
The signal processing circuit as described above preferably further comprises a first filtering module and a second filtering module;
the first end of the first filtering module is connected with the signal input port, filtering processing is carried out on the received microwave signal, and the second end of the first filtering module is connected with the power detection module;
and the first end of the second filtering module is connected with the second end of the attenuation module, the attenuated microwave signals are subjected to filtering treatment, and the second end of the second filtering module is connected with the signal output port.
The signal processing circuit as described above preferably further comprises a signal mixing module, wherein a first end of the signal mixing module is connected to the second end of the second filtering module, and a second end of the signal mixing module is connected to the signal output port.
The signal processing circuit as described above, preferably, the power detection module includes a coupler, a detector, and a comparator connected in series in order;
the other end of the coupler is coupled with the signal input port;
the other end of the comparator outputs a power detection signal.
The application further provides a signal receiving device, which comprises a cavity, wherein a PCB (printed circuit board) is accommodated in the cavity, and any one of the signal processing circuits is integrated on the PCB.
Another aspect of the present application provides a quantum control system, including the signal receiving device described above.
In a further aspect, the present application provides a quantum computer, including the quantum control system and a quantum processor, where the quantum control system processes a microwave signal carrying quantum state information output by the quantum processor.
Compared with the prior art, the application has the following beneficial effects:
the application provides a signal processing circuit which is applied to a quantum measurement and control circuit and is used for amplifying a microwave signal carrying quantum state information output by a quantum processor, and the signal processing circuit comprises a power detection module and a signal amplifying link which are connected in sequence; the signal amplification link comprises a plurality of signal amplification paths which are gated by a switch, wherein the gains of the signal amplification paths are different; the power detection module controls the switch to be communicated with a signal amplification path to the signal output port according to the power of the microwave signal received by the signal input port. For example, when the power detection module detects that the power of the input microwave signal is higher, the control switch is communicated with one signal amplification path with lower gain to transmit the microwave signal; when the power detection module detects that the power of an input microwave signal is lower, the control switch is communicated with one signal amplification path with higher gain to transmit the microwave signal; the power value of the microwave signal output by the signal output port is ensured to have a smaller variation range, the measurement of the measuring equipment is facilitated, and the flexibility and the applicability of the measuring equipment for measuring the microwave signal with larger power interval span output by the quantum processor are improved.
Drawings
Fig. 1 is a schematic diagram of a measurement circuit of a quantum processor according to an embodiment of the present application;
fig. 2 is a schematic diagram of a signal processing circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of a switch combination of a signal processing circuit according to an embodiment of the present application;
fig. 4 is a schematic diagram 1 of a switch combination of another signal processing circuit according to an embodiment of the present application;
fig. 5 is a schematic diagram 2 of a switch combination of another signal processing circuit according to an embodiment of the present application;
fig. 6 is a schematic diagram of a switch module according to an embodiment of the present application;
fig. 7 is a schematic diagram 1 of another switch module according to an embodiment of the present application;
fig. 8 is a schematic diagram 2 of another switch module according to an embodiment of the present application;
fig. 9 is a schematic diagram of a signal processing circuit including an attenuation module according to an embodiment of the present application;
fig. 10 is a schematic diagram of a signal processing circuit including a filtering module according to an embodiment of the present application;
fig. 11 is a schematic diagram of a signal processing circuit including a signal mixing module according to an embodiment of the present application;
fig. 12 is a schematic circuit diagram of a power detection module according to an embodiment of the present application.
Reference numerals illustrate:
1-a signal processing device, 2-a refrigeration device, 3-a measuring device and 4-a quantum processor;
the device comprises a power detection module 11-a signal amplification link 12-a signal input port 13-a signal output port 14-an attenuation module 15-a first filtering module 16-a second filtering module 17-a signal mixing module 18-a signal amplifying module;
111-coupler, 112-detector, 113-comparator, 121-signal amplifying branch, 122-signal amplifying unit;
1230-first switch module 1240-second switch module, 1231-first switch unit, 1232-second switch unit, 1233-third switch unit.
Detailed Description
The following detailed description is merely illustrative and is not intended to limit the embodiments and/or the application or uses of the embodiments. Furthermore, there is no intention to be bound by any expressed or implied information presented in the preceding background or brief summary or the detailed description section.
For purposes of clarity, technical solutions, and advantages of embodiments of the present application, one or more embodiments will now be described with reference to the drawings, wherein like reference numerals are used to refer to like components throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a more thorough understanding of one or more embodiments. It may be evident, however, that one or more embodiments may be practiced without these specific details, and that such embodiments may be incorporated by reference herein without departing from the scope of the claims.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The measuring circuit schematic diagram of the quantum processor 4 shown in fig. 1 comprises the quantum processor 4 positioned in the lowest temperature zone of the refrigerating equipment 2, and the measuring equipment 3 positioned outside the dilution refrigerating machine and used for measuring the microwave signal carrying quantum state information output by the quantum processor 4, wherein the quantum processor 4 and the measuring equipment 3 are connected by a test circuit. The quantum processor 4 integrates a plurality of qubits for executing quantum computation, the qubits are very sensitive to the influence of environmental noise, so that very weak microwave signals are generally adopted for controlling and nondestructively reading the qubits, the power of the microwave signals carrying quantum state information output by the qubits is very low and is as low as-100 dBm, and a plurality of signal amplifier devices are arranged in a test circuit for amplifying the microwave signals output by the qubits, so that the measuring equipment 3 in a room temperature environment can conveniently measure.
In addition, the calculation tasks executed by the qubits on the quantum processor 4 are diversified, the power of the microwave signals output by different qubits on the quantum processor 4 is different, the power interval span is large, the number of signal amplifiers and gain parameters set in the test line are fixed, so that the power variation range of the microwave signals to be measured received by the measuring device 3 in the room temperature environment is also large, and the measuring device 3 is difficult to measure. Based on this, a signal processing device 1 integrated with a signal processing circuit is provided, which is disposed in a room temperature environment, connects a test line and a measurement device 3, processes a microwave signal with a large power interval span transmitted in the test line, and transmits the processed microwave signal to the measurement device 3 for measurement.
Specifically, as shown in fig. 2, the embodiment of the application provides a signal processing circuit, which is applied to a quantum measurement and control circuit and is used for amplifying a microwave signal carrying quantum state information output by a quantum processor 4, and comprises a power detection module 11 and a signal amplifying link 12 which are connected in sequence; the signal amplifying link 12 comprises a plurality of signal amplifying paths which are gated by a switch, wherein the gains of the signal amplifying paths are different; the power detection module 11 controls the switch to communicate a signal amplifying path to the signal output port 14 according to the power of the microwave signal received by the signal input port 13.
The signal amplifying link 12 includes a plurality of signal amplifying paths, each of which has different gains, the power detecting module 11 is connected with the signal amplifying paths through a switch, and the power detecting module 11 can be connected with one of the signal amplifying paths and the signal output port 14 through the switch, and the connected signal amplifying path amplifies the microwave signal. The power detection module 11 measures the power of the microwave signal received by the signal input port 13, and controls a signal amplification path with proper gain in the switch communication signal amplification link 12 according to the measured power value. For example, when the power detection module 11 detects that the power of the input microwave signal is high, the control switch is communicated with one signal amplification path with low gain to transmit the microwave signal; when the power detection module 11 detects that the power of the input microwave signal is lower, the control switch is communicated with one signal amplification path with higher gain to transmit the microwave signal; the change range of the power value of the microwave signal output by the signal output port 14 is ensured to be smaller, the measurement of the measuring equipment 3 is facilitated, and the flexibility and the applicability of the measuring equipment 3 to measuring the microwave signal with larger power interval span output by the quantum processor 4 are improved.
In fig. 2, 4 signal amplification paths are illustrated, wherein an integrated element for amplifying a microwave signal is not disposed on the lowermost signal amplification path, and it can be understood that the gain of the signal amplification path is 0. In addition, the number of integrated components and specific gain set on the signal amplification paths are only examples, and the power parameter of the microwave signal output by the quantum processor 4 and the measurement range of the measurement device 3 need to be set, which is not described in detail in this embodiment. It should be noted that the switch combination in fig. 2 is only an example, and the switch is not limited to a single pole multi-throw switch, but may be other switch combinations.
As shown in fig. 3, as one implementation of the embodiment of the present application, a specific form of a signal amplifying link 12 is illustrated, the signal amplifying link 12 includes a first switch module 1230 and a second switch module 1240, and several signal amplifying branches 121 connecting the first switch module 1230 and the second switch module 1240 in parallel; the stationary end of the first switch module 1230 is connected to the power detection module 11, and the stationary end of the second switch module 1240 is connected to the signal output port 14; the input end and the output end of each signal amplifying branch 121 are respectively connected with the moving ends of the first switch module 1230 and the second switch module 1240 one by one; wherein the gain of each of the signal amplifying branches 121 is different.
Specifically, the first switch module 1230 and the second switch module 1240 each adopt a single-pole multi-throw switch, the stationary ends of the two single-pole multi-throw switches are respectively connected to the power detection module 11 and the signal output port 14, and the movable ends are switched between the signal amplification branches 121. The power detection module 11 controls the moving ends of the first switch module 1230 and the second switch module 1240 to switch to the two ends of one signal amplifying branch 121 according to the power detection result of the received microwave signal, so as to ensure that the power of the microwave signal output through the output port is within the measurement range of the measurement device 3. Wherein the number of the movable ends of the single-pole multi-throw switch is determined according to the number of the signal amplifying branches 121; in this embodiment, the single pole multi-throw switch is preferably a microwave switch, and the power detection module 11 is electrically connected to each microwave switch, so as to control each microwave switch.
As further shown in fig. 3, the signal amplifying branch 121 includes a plurality of signal amplifying units 122 connected in series, and different gains of the signal amplifying branches 121 are achieved by connecting a plurality of signal amplifying units 122 in series to the signal amplifying branch 121. In addition, the signal amplifying unit 122 may not be provided on one of the signal amplifying branches 121, i.e., the gain of the signal amplifying branch 121 is 0. In the present embodiment, the signal amplifying unit 122 may employ a low noise amplifier. The number of low noise amplifiers on each signal amplifying branch 121 is determined in dependence on the power parameters of the microwave signal output by the quantum processor 4 and the measuring range of the measuring device 3.
As shown in fig. 4 and fig. 5, as one implementation manner of the embodiment of the present application, another specific circuit of the signal amplifying link 12 is further illustrated, where the signal amplifying link 12 includes a plurality of stages of signal amplifying units 122 and a plurality of switch modules 123 connected in series in sequence; the switch module 123 is configured to connect the power detection module 11 with the signal output port 14; or an input terminal for connecting the power detection module 11 and each of the signal amplifying units 122; or for connecting the input and output of adjacent signal amplification units 122; or for connecting the output of each of the signal amplifying units 122 with the signal output port 14.
In the present embodiment, a plurality of switching modules 123 are connected with a multi-stage signal amplifying unit 122. The signal amplification branches 121 comprising a different number of signal amplification units 122 are realized by means of a connection of the switching modules 123. Specifically, a switch module 123 is disposed between the power detection module 11 and the input end of the first-stage signal amplification unit 122, and is used for switching between the first-stage signal amplification unit 122 and the signal output port 14, when the switch module 123 is connected to the signal output port 14, the gain of the signal amplification branch 121 is 0, and when the switch module 123 is connected to the first-stage signal amplification unit 122, the gain of the signal amplification branch 121 is determined by the gain of the first-stage signal amplification unit 122.
In addition, a switch module 123 is also disposed between two adjacent signal amplifying units 122, for switching between the two adjacent signal amplifying units and the signal output port 14, when the switch module 123 is connected to the signal output port 14, the gain of the signal amplifying branch 121 is the gain of the signal amplifying unit 122 at the previous stage; it should be added that, at this time, the switch module 123 between the power detection module 11 and the first stage signal amplifying unit 122 needs to be connected to the previous stage signal amplifying unit 122; when the switching module 123 is connected to the signal amplifying unit 122 of the subsequent stage, the gain of the signal amplifying branch 121 is determined by the first stage signal amplifying unit 122 and the gain of the first stage signal amplifying unit 122.
And a switch module 123 is also provided at the output end of the last stage signal amplifying unit 122 and the signal output port 14 for switching between the previous stage signal amplifying unit 122, the last stage signal amplifying unit 122 and the switch module 123 connected to the power detecting module 11. When the switch module 123 is connected to the last stage of signal amplifying unit 122, the gain of the signal amplifying branch 121 is determined by the sum of the gains of all the signal amplifying units 122 connected in the branch; it should be added that, at this time, the signal amplifying units 122 of the previous stages need to be connected through the switch module 123. When this switching module 123 communicates with the signal amplifying unit 122 of the previous stage, the gain of this signal amplifying branch 121 is determined by the sum of the gains of the signal amplifying units 122 communicating with the previous stages in the branch. When the switch module 123 is connected to the switch module 123 of the power detection module 11, the gain of the signal amplifying branch 121 is 0.
For example, under the communication path of each switch module 123 in fig. 4 and fig. 5, each signal amplifying unit 122 in the entire signal amplifying branch 121 participates in signal amplifying, and the gain of the signal amplifying branch 121 is the sum of the gains of all the signal amplifying units 122. Other combinations of the switch modules 123 can be determined by the signal amplifying unit 122 participating in signal amplification in the signal amplifying branch 121 with reference to the combinations described above. By the combination of the switch modules 123, it is possible to realize the signal amplification branches 121 including different numbers of signal amplification units 122, thereby realizing the signal amplification branches 121 of different gains.
Further, illustrated in fig. 4 is a signal amplification link 12 including two signal amplification units 122, and illustrated in fig. 5 is a signal amplification link 12 including three signal amplification units 122. It is conceivable that the signal amplifying link 12 may further include other signal amplifying units 122, and the switch module 123 may be disposed between adjacent signal amplifying units 122, which is not described in detail in this embodiment.
As shown in fig. 6, in the present embodiment, the switch modules 123 are specifically defined according to the positions and connection relations of the switch modules 123 in the signal amplifying link 12, and specifically, the switch modules 123 include a first switch unit 1231, a second switch unit 1232, and a third switch unit 1233; the first switch unit 1231 is configured to communicate the power detection module 11 with an input end of the first-stage signal amplifying unit 122 or is configured to communicate the power detection module 11 with the third switch unit 1233; the second switch unit 1232 is configured to connect the output end of the signal amplifying unit 122 at the previous stage with the input end of the signal amplifying unit 122 at the next stage or connect the output end of the signal amplifying unit 122 at the previous stage with the third switch unit 1233; the third switch unit 1233 is configured to communicate the output end of the signal amplifying unit 122 of the last stage with the signal output port 14, or to communicate the first switch unit 1231 with the signal output port 14, or to communicate the second switch unit 1232 with the signal output port 14.
It should be added that, for the communication functions of the first, second, and third switching units 1231, 1232, and 1233, which are determined according to the signal amplifying link 12 illustrated in fig. 6, when the switching modules 123 in the signal amplifying link 12 take other combinations, the communication functions of the first, second, and third switching units 1231, 1232, and 1233 need to be redefined. For example, as shown in fig. 7, in the signal amplifying link 12, a first switch unit 1231 is used to connect the power detection module 11 with the input end of the signal amplifying unit 122 of the first stage or to connect the power detection module 11 with the signal output port 14.
In addition, fig. 5, 6 and 7 illustrate the signal amplifying link 12 including three signal amplifying units 122, and when the signal amplifying link 12 includes other numbers of signal amplifying units 122, the communication functions of the first, second and third switching units 1231, 1232 and 1233 also need to be re-determined, for example, the signal amplifying link 12 including four signal amplifying units 122 shown in fig. 8. It can be found, however, that the communication functions of the plurality of second switch units 1232 located between the adjacent two signal amplifying units 122 are the same, and that the same circuit configuration is set when the signal amplifying link 12 includes a greater number of signal amplifying units 122.
The combination modes of the signal amplifying unit 122 and the switch module 123 shown in fig. 4, fig. 5, fig. 6, fig. 7 and fig. 8 are only one embodiment, and other combination modes capable of realizing the communication of the plurality of signal amplifying units 122 are all within the protection scope of the present application.
Referring to fig. 4, fig. 5, fig. 6, fig. 7, and fig. 8, the first switch unit 1231, the second switch unit 1232, and the third switch unit 1233 each include a plurality of single pole, multi throw switches. In this embodiment, the switch modules 123 each adopt a single-pole multi-throw switch, and the movable ends of the single-pole multi-throw switches are switched to communicate with other switches or the signal amplifying units 122, so as to realize the switching of the multiple signal amplifying branches 121.
As shown in fig. 6 and 8, the first switch unit 1231 includes at least one single pole double throw switch; the fixed end of the single-pole double-throw switch is connected with the power detection module 11; the moving end of the single pole double throw switch is connected to the input end of the first stage signal amplifying unit 122 or the third switching unit 1233. Specifically, the first switch unit 1231 is configured to connect the power detection module 11 with the input end of the signal amplifying unit 122 of the first stage or to connect the power detection module 11 with the third switch unit 1233, and a single-pole double-throw switch is used to implement a connection function.
Referring to fig. 5, 6, and 8, the second switch unit 1232 includes at least one first single-pole double-throw switch and a first multi-throw switch unit, where the first multi-throw switch unit includes two single-pole double-throw switches with stationary ends connected in series; the fixed end of the first single-pole double-throw switch is connected with the output end of the signal amplifying unit 122 of the previous stage, and the movable end of the first single-pole double-throw switch is respectively connected with the input end of the signal amplifying unit 122 of the next stage and the movable end of the first multi-throw switch unit; the moving end of the first multi-throw switch unit is connected to the output end of the signal amplifying unit 122 of the previous stage, the moving end of the first single-pole double-throw switch, the input end of the signal amplifying unit 122 of the next stage, and the third switch unit 1233, respectively.
Referring to fig. 6, fig. 7, and fig. 8, the third switch unit 1233 includes at least one single pole three-throw switch or a second multi-throw switch unit, where the second multi-throw switch unit includes a single pole double-throw switch with a movable end and a stationary end connected in series; the stationary end of the single-pole three-throw switch and the stationary end of the second multi-throw switch unit are both connected to the signal output port 14, and the movable end of the single-pole three-throw switch and the movable end of the second multi-throw switch unit are both connected to the output end of the signal amplifying unit 122 or the first switch unit 1231 or the second switch unit 1232 of the last stage.
Specifically, the third switch unit 1233 is configured to communicate the output end of the signal amplifying unit 122 of the last stage with the signal output port 14 or is configured to communicate the first switch unit 1231 with the signal output port 14 or is configured to communicate the second switch unit 1232 with the signal output port 14, where the third switch unit 1233 needs to have at least three active ends, and may be implemented by directly using a single pole three throw switch, or may be implemented by using a combination of two single pole double throw switches, and in the drawing, an example is implemented by combining two single pole double throw switches.
As shown in fig. 9, as an implementation manner of the embodiment of the present application, the signal processing circuit further includes an attenuation module 15 with an adjustable attenuation value, a first end of the attenuation module 15 is connected to the third switch unit 1233, and a second end of the attenuation module 15 is connected to the signal output port 14. The attenuation of the microwave signal processed by the signal amplifying link 12 is performed by providing an attenuation module 15 with an adjustable attenuation value between the third switch unit 1233 and the signal output port 14, wherein the attenuation value is adjusted according to the power value of the microwave signal, so as to ensure that the power of the microwave signal output through the signal output port 14 is within the measurement range of the measurement device 3.
As shown in fig. 10, as an implementation manner of the embodiment of the present application, the signal processing circuit further includes a first filtering module 16 and a second filtering module 17; a first end of the first filtering module 16 is connected with the signal input port 13, filtering processing is performed on the received microwave signal, and a second end of the first filtering module 16 is connected with the power detection module 11; the first end of the second filtering module 17 is connected to the second end of the attenuation module 15, and filters the attenuated microwave signal, and the second end of the second filtering module 17 is connected to the signal output port 14. The power detection module 11 is connected with the signal input port 13, the attenuation module 15 is connected with the signal output port 14, reflection is generated when microwave signals are transmitted between the ports, and the first filter module 16 and the second filter module 17 are arranged between the ports to perform impedance matching, so that the reflection of the microwave signals is avoided. In addition, the first filtering module 16 and the second filtering module 17 can also filter the microwave signals in the specific frequency band, so that the effect of filtering stray signals can be achieved, and the precision of the microwave signals is improved.
As shown in fig. 11, as an implementation manner of the embodiment of the present application, the signal processing circuit further includes a signal mixing module 18, where a first end of the signal mixing module 18 is connected to the second end of the second filtering module 17, and a second end of the signal mixing module 18 is connected to the signal output port 14. The signal processing circuit of this embodiment is used for processing the microwave signal output by the quantum processor, and since the working frequency of the quantum processor is usually between 4GHz and 8GHz, the frequency of the microwave signal output is also between 4GHz and 8 GHz. In the signal processing circuit of the embodiment, the signal mixing module 18 is disposed near the signal output port 14, and performs down-conversion processing on the microwave signal after power adjustment, and processes the microwave signal with high frequency into an intermediate frequency signal that can be measured by the measuring device. In addition, when the signal mixing module 18 adopts the IQ mixing principle or the secondary frequency conversion principle, a local oscillation signal needs to be applied to the signal mixing module 18.
As shown in fig. 12, as an implementation manner of the embodiment of the present application, the power detection module 11 includes a coupler 111, a detector 112, and a comparator 113 sequentially connected in series; the other end of the coupler 111 is coupled with the signal input port 13; the other end of the comparator 113 outputs a power detection signal. Specifically, the coupler 111 couples the microwave signal received by the signal input port 13, the coupled signal is transmitted to the detector 112 for processing, the processed signal is transmitted to the comparator 113 for comparison, the compared power detection signal is output, the switch is controlled to be communicated according to the compared power detection signal, and the power of the microwave signal output by the signal output port 14 is ensured to be within the measuring range of the measuring device 3.
Based on the same application conception, the embodiment of the application also provides a signal receiving device, which comprises a cavity, wherein a PCB (printed circuit board) is accommodated in the cavity, and any one of the signal processing circuits is integrated on the PCB. Two side surfaces of the cavity are provided with signal connectors, and the signal connectors are respectively and electrically connected with a signal input port and a signal output port of the signal processing circuit. In addition, the airtight cavity can be used for shielding various external noises, so that the performance of signal elements in a signal processing circuit on a PCB is prevented from being influenced.
Based on the same application conception, the embodiment of the application also provides a quantum control system which comprises the signal receiving device. The quantum processor is integrated with a plurality of quantum bits, as the number of the quantum bits is increased, the number of required signal receiving devices is correspondingly increased, the plurality of signal receiving devices are integrated in a quantum control system, and a signal transmitting device for controlling and measuring the quantum processor is integrated in the quantum control system, so that the quantum processor is ensured to execute quantum computing tasks.
Based on the same application conception, the embodiment of the application also provides a quantum computer which comprises the quantum control system and a quantum processor, wherein the quantum control system processes the microwave signal carrying quantum state information output by the quantum processor.
While the foregoing is directed to embodiments of the present application, other and further embodiments of the application may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (15)
1. The signal processing circuit is applied to a quantum measurement and control circuit and is used for amplifying a microwave signal carrying quantum state information output by a quantum processor, and is characterized by comprising a power detection module and a signal amplifying link which are connected in sequence;
the signal amplification link comprises a plurality of signal amplification paths which are gated by a switch, wherein the gains of the signal amplification paths are different; the signal amplifying link comprises a plurality of stages of signal amplifying units and a plurality of switch modules which are sequentially connected in series; the switch module is used for connecting the power detection module with the signal output port; or the input end is used for connecting the power detection module and each signal amplification unit; or for connecting the input and output of adjacent signal amplifying units; or is used for connecting the output end of each signal amplifying unit with the signal output port;
the power detection module controls the switch to be communicated with a signal amplification path to the signal output port according to the power of the microwave signal received by the signal input port.
2. The signal processing circuit of claim 1, wherein the signal amplification link comprises a first switch module and a second switch module, and a number of signal amplification branches connecting the first switch module and the second switch module in parallel;
the fixed end of the first switch module is connected with the power detection module, and the fixed end of the second switch module is connected with the signal output port;
the input end and the output end of each signal amplifying branch are respectively connected with the movable ends of the first switch module and the second switch module one by one;
wherein the gain of each signal amplifying branch is different.
3. The signal processing circuit of claim 2, wherein the signal amplification branch comprises a plurality of signal amplification units connected in series.
4. The signal processing circuit of claim 1, wherein the switching module comprises a first switching unit, a second switching unit, and a third switching unit;
the first switch unit is used for communicating the power detection module with the input end of the first-stage signal amplification unit or communicating the power detection module with the third switch unit;
the second switch unit is used for communicating the output end of the signal amplifying unit of the previous stage with the input end of the signal amplifying unit of the next stage or communicating the output end of the signal amplifying unit of the previous stage with the third switch unit;
the third switch unit is used for communicating the output end of the signal amplifying unit of the last stage with the signal output port or communicating the first switch unit with the signal output port or communicating the second switch unit with the signal output port.
5. The signal processing circuit of claim 4, wherein the first switching unit, the second switching unit, and the third switching unit each comprise a number of single pole, multi throw switches.
6. The signal processing circuit of claim 5, wherein the first switching unit comprises at least one single pole double throw switch;
the fixed end of the single-pole double-throw switch is connected with the power detection module;
and the movable end of the single-pole double-throw switch is connected with the input end of the signal amplifying unit of the first stage or the third switch unit.
7. The signal processing circuit of claim 5, wherein the second switching unit comprises at least a first single pole double throw switch and a first multi-throw switching unit, wherein the first multi-throw switching unit comprises a single pole double throw switch with two stationary ends in series;
the fixed end of the first single-pole double-throw switch is connected with the output end of the signal amplifying unit of the previous stage, and the movable end of the first single-pole double-throw switch is respectively connected with the input end of the signal amplifying unit of the next stage and the movable end of the first multi-throw switch unit;
the movable end of the first multi-throw switch unit is respectively connected with the output end of the signal amplifying unit at the previous stage, the movable end of the first single-pole double-throw switch, the input end of the signal amplifying unit at the next stage and the third switch unit.
8. The signal processing circuit of claim 5, wherein the third switching unit comprises at least one single pole, three throw switch or a second multi-throw switching unit, wherein the second multi-throw switching unit comprises a single pole, double throw switch with a movable end in series with a stationary end;
the fixed end of the single-pole three-throw switch and the fixed end of the second multi-throw switch unit are both connected with the signal output port, and the movable end of the single-pole three-throw switch and the movable end of the second multi-throw switch unit are both connected with the output end of the signal amplifying unit or the first switch unit or the second switch unit of the last stage.
9. The signal processing circuit of claim 4, further comprising an attenuation module having an adjustable attenuation value, a first end of the attenuation module being connected to the third switching unit and a second end of the attenuation module being connected to the signal output port.
10. The signal processing circuit of claim 9, further comprising a first filtering module and a second filtering module;
the first end of the first filtering module is connected with the signal input port, filtering processing is carried out on the received microwave signal, and the second end of the first filtering module is connected with the power detection module;
and the first end of the second filtering module is connected with the second end of the attenuation module, the attenuated microwave signals are subjected to filtering treatment, and the second end of the second filtering module is connected with the signal output port.
11. The signal processing circuit of claim 10, further comprising a signal mixing module, a first end of the signal mixing module coupled to the second end of the second filtering module, a second end of the signal mixing module coupled to the signal output port.
12. The signal processing circuit of claim 1, wherein the power detection module comprises a coupler, a detector, and a comparator in series;
the other end of the coupler is coupled with the signal input port;
the other end of the comparator outputs a power detection signal.
13. A signal receiving apparatus comprising a cavity, wherein a PCB board is accommodated in the cavity, and wherein the PCB board is integrated with the signal processing circuit according to any one of claims 1 to 12.
14. A quantum control system comprising the signal receiving device of claim 13.
15. A quantum computer comprising the quantum control system of claim 14 and a quantum processor, the quantum control system processing microwave signals carrying quantum state information output by the quantum processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211431506.9A CN115759273B (en) | 2022-11-15 | 2022-11-15 | Signal processing circuit, quantum control system and quantum computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211431506.9A CN115759273B (en) | 2022-11-15 | 2022-11-15 | Signal processing circuit, quantum control system and quantum computer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115759273A CN115759273A (en) | 2023-03-07 |
| CN115759273B true CN115759273B (en) | 2023-12-12 |
Family
ID=85371615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211431506.9A Active CN115759273B (en) | 2022-11-15 | 2022-11-15 | Signal processing circuit, quantum control system and quantum computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115759273B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315536A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| CN114268285A (en) * | 2021-12-17 | 2022-04-01 | 广州润芯信息技术有限公司 | Automatic gain control device with large-range power variation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11940392B2 (en) * | 2019-04-18 | 2024-03-26 | International Business Machines Corporation | Measurement scheme for superconducting qubits using low-frequency microwave signals within a dilution refrigerator |
-
2022
- 2022-11-15 CN CN202211431506.9A patent/CN115759273B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315536A (en) * | 2021-05-28 | 2021-08-27 | 维沃移动通信有限公司 | Radio frequency circuit and electronic device |
| CN114268285A (en) * | 2021-12-17 | 2022-04-01 | 广州润芯信息技术有限公司 | Automatic gain control device with large-range power variation |
Non-Patent Citations (1)
| Title |
|---|
| 王战.基于超导量子比特芯片的测控与量子模拟.中国优秀博士学位论文全文数据库 基础科学辑.2022,A005-13. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115759273A (en) | 2023-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111525901B (en) | Radio frequency circuit, radio frequency signal transmitting and receiving method and wireless communication device | |
| CN113839681B (en) | Radio frequency PA Mid device, radio frequency system and communication equipment | |
| WO2021248344A1 (en) | 1t2r radio-frequency circuit and wireless communication device | |
| CN109257063B (en) | Broadband channelization transceiver | |
| CN107017917B (en) | A kind of power amplifier method and apparatus of tri- frequency automatic identification of TD-LTE | |
| CN114640358B (en) | Radio frequency PA Mid device, radio frequency receiving and transmitting system and communication equipment | |
| WO2021248518A1 (en) | 5g radio frequency receiving circuit and wireless communication device | |
| CN104168001A (en) | Eight-channel gain-controllable down converter | |
| WO2021174565A1 (en) | Balanced amplifier, and power amplification method for radio-frequency signal | |
| JP2012257030A (en) | Signal switching device | |
| CN115759273B (en) | Signal processing circuit, quantum control system and quantum computer | |
| CN214480592U (en) | Radio frequency module, radio frequency circuit and electronic equipment | |
| CN104104407A (en) | Multifunctional microwave transmit-receive front end | |
| CN110190820A (en) | A kind of delay amplifier module for broadband reception | |
| CN115459866A (en) | Standing wave detection method and device | |
| CN115688929B (en) | Signal processing device, quantum control system and quantum computer | |
| CN113484735B (en) | Chip test gating module and chip test system | |
| CN218450053U (en) | Signal processing circuit, test circuit, transmitter and quantum computer | |
| CN109257065A (en) | A kind of method and circuit, terminal for eliminating mutual interference | |
| CN112751547B (en) | Interference type analog microwave complex correlator device | |
| KR20200124601A (en) | Radio-frequency signal sending/receiving circuit and radio-frequency signal sending/receiving device | |
| CN113517871B (en) | Bidirectional power amplifying device | |
| CN219087140U (en) | Reconfigurable test system | |
| CN114665903B (en) | Millimeter wave front end processing circuit | |
| CN112751578B (en) | Radio frequency ELNA device and radio frequency system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 230088 6th floor, E2 building, phase II, innovation industrial park, 2800 innovation Avenue, high tech Zone, Hefei City, Anhui Province Applicant after: Benyuan Quantum Computing Technology (Hefei) Co.,Ltd. Address before: 230088 6th floor, E2 building, phase II, innovation industrial park, 2800 innovation Avenue, high tech Zone, Hefei City, Anhui Province Applicant before: ORIGIN QUANTUM COMPUTING COMPANY, LIMITED, HEFEI |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |