CN109004989A - A kind of generation system and method for quantum bit logical signal - Google Patents
A kind of generation system and method for quantum bit logical signal Download PDFInfo
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Abstract
The present invention provides a kind of generation system and method for quantum bit logical signal, first frequency mixer is mixed to obtain the first mixed frequency signal to baseband signal and the first local oscillation signal, first signal processing module is filtered to the first mixed frequency signal and enhanced processing, second frequency mixer is mixed to obtain the second mixed frequency signal to treated the first mixed frequency signal and the second local oscillation signal, second signal processing module is filtered to the second mixed frequency signal and enhanced processing, the logical signal of treated the second mixed frequency signal is quantum bit.Compared with prior art, the generation system and method for quantum bit logical signal provided by the invention, the signal leakage generated in modulation mixing and mirror image can not only be effective filtered out, and can satisfy superconductive quantum bit to the high-precision requirement of the frequency of logical signal needed for single quantum bit operation, phase and amplitude.
Description
Technical field
The present invention relates to quantum bit technical fields, more specifically to a kind of generation of quantum bit logical signal
System and method.
Background technique
Quantum bit is the core of quantum chip, by the coding to quantum bit, can be realized the far super classical meter of performance
The quantum algorithm of calculation machine algorithm.It wherein, to the coding of quantum bit is realized by additional logical signal, with classical bit institute
The logical signal needed is that the digital signal of low and high level is different, and logical signal needed for quantum bit is analog pulse signal.
Prior art discloses a kind of methods of logical signal for generating quantum bit, use orthogonal modulation technique to base
The baseband signal that band signal generator generates is modulated, to obtain the logical signal of quantum bit, wherein baseband signal includes
Modulation coding information needed for quantum bit gate operation, i.e., comprising to modulation coding information needed for quantum bit coding.
But signal leakage and mirror image can be generated during being modulated mixing to baseband signal using orthogonal modulation technique, it leads
The second-rate of the logical signal generated is caused, quantum bit especially superconductive quantum bit cannot be met, single quantum bit is operated
The high-precision requirement of required logical signal.
Summary of the invention
In view of this, the present invention provides a kind of generation system and method for quantum bit logical signal, to improve quantum
The quality of logical signal needed for bit.
To achieve the above object, the invention provides the following technical scheme:
A kind of generation system of quantum bit logical signal, including baseband signal generation module, the first local oscillation signal generate
At module, the first frequency mixer, the first signal processing module, the second frequency mixer, the second local oscillation signal generation module and second signal
Manage module；
The baseband signal generation module is mixed for generating baseband signal, and by baseband signal input described first
Device, the baseband signal include modulation coding information needed for quantum bit gate operation；
The first local oscillation signal generation module is inputted for generating the first local oscillation signal, and by first local oscillation signal
First frequency mixer；
First frequency mixer is used to be mixed the baseband signal and first local oscillation signal, and will be after mixing
The first obtained mixed frequency signal is transmitted to first signal processing module；
First signal processing module is used to be filtered first mixed frequency signal and enhanced processing, and will processing
The first mixed frequency signal afterwards is transmitted to second frequency mixer；
The second local oscillation signal generation module is transmitted for generating the second local oscillation signal, and by second local oscillation signal
To second frequency mixer；
Second frequency mixer is used to mix treated first mixed frequency signal and second local oscillation signal
Frequently, and by the second mixed frequency signal obtained after mixing it is transmitted to the second signal processing module；
The second signal processing module is used to be filtered second mixed frequency signal and enhanced processing, and at output
The second mixed frequency signal after reason, and the logical signal of treated the second mixed frequency signal the is quantum bit.
Preferably, the baseband signal generation module includes baseband signal maker and first filter；
The baseband signal maker is for generating baseband signal；
The high frequency in the baseband signal that the first filter is used to that the baseband signal maker to be inhibited to generate is miscellaneous
Dissipate noise.
Preferably, the first local oscillation signal generation module includes the first local oscillator signal generator and the first amplifier, institute
State the first local oscillator signal generator for generate the first local oscillation signal, first amplifier is for first local oscillation signal
Amplify processing.
Preferably, the second local oscillation signal generation module includes the second local oscillation signal generator and the second amplifier；
The second local oscillation signal generator is used for for generating the second local oscillation signal, second amplifier to described the
Two local oscillation signals amplify processing.
Preferably, first signal processing module includes first filter array and the first amplifying circuit,
The first filter array is used to filter out the signal except the frequency range of the first required mixed frequency signal；
First amplifying circuit is for amplifying processing to first mixed frequency signal.
Preferably, the first filter array is switched bandpass filter array；
First amplifying circuit is power amplifier-amplifier Cascaded amplification route.
Preferably, the second signal processing module includes second filter array and the second amplifying circuit；Described second
Filter array is used to filter out the signal except the frequency range of the second required mixed frequency signal；Second amplifying circuit is used for institute
It states the second mixed frequency signal and amplifies processing.
Preferably, the second filter array is switched bandpass filter array；
Second amplifying circuit is power amplifier-amplifier Cascaded amplification route.
Preferably, further includes: modulated signal transmitting terminal；The modulated signal transmitting terminal and the second signal processing module
It is connected, for exporting treated the second mixed frequency signal.
A kind of generation method of quantum bit logical signal is applied to described in any item quantum bit logical signals as above
Generation system, comprising:
The baseband signal and the generation of the first local oscillation signal generation module that first frequency mixer generates baseband signal generation module
The first local oscillation signal be mixed to obtain the first mixed frequency signal；
First signal processing module is filtered to first mixed frequency signal and enhanced processing；
Second frequency mixer treated first mixed frequency signal and the second local oscillation signal generation module are generated second
Local oscillation signal is mixed to obtain the second mixed frequency signal；
Second signal processing module is filtered to second mixed frequency signal and enhanced processing, and exports that treated the
Two mixed frequency signals, the logical signal of treated the second mixed frequency signal the is quantum bit.
Compared with prior art, the technical scheme provided by the invention has the following advantages:
The generation system and method for quantum bit logical signal provided by the present invention, the first frequency mixer to baseband signal and
First local oscillation signal is mixed to obtain the first mixed frequency signal, the first signal processing module the first mixed frequency signal is filtered and
Enhanced processing, the second frequency mixer are mixed treated the first mixed frequency signal and the second local oscillation signal to obtain the second mixing letter
Number, second signal processing module is filtered to the second mixed frequency signal and enhanced processing, and treated, and the second mixed frequency signal is
The logical signal of quantum bit.Compared with prior art, the generation system of quantum bit logical signal provided by the invention and side
Method can not only effective filter out the signal leakage generated in modulation mixing and mirror image, and can satisfy superconductive quantum bit
To the high-precision requirement of the frequency of logical signal needed for single quantum bit operation, phase and amplitude.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the generation system of quantum bit logical signal provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the generation system of another quantum bit logical signal provided in an embodiment of the present invention；
Fig. 3 is a kind of flow chart of the generation method of quantum bit logical signal provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of generation systems of quantum bit logical signal, as shown in Figure 1, including that base band is believed
Number generation module 10, the first local oscillation signal generation module 11, the first frequency mixer 12, the mixing of the first signal processing module 13, second
Device 14, the second local oscillation signal generation module 15 and second signal processing module 16.
Wherein, baseband signal generation module 10 is for generating baseband signal, and by base band signal transmission to the first frequency mixer
12, which includes modulation coding information needed for quantum bit gate operation, i.e., comprising encoding institute to quantum bit
The encoded information needed；First local oscillation signal generation module 11 is transmitted for generating the first local oscillation signal, and by the first local oscillation signal
To the first frequency mixer 12；First frequency mixer 12 will be obtained for being mixed to baseband signal and the first local oscillation signal after mixing
To the first mixed frequency signal be transmitted to the first signal processing module 13, wherein the frequency of the first mixed frequency signal be equal to baseband signal
Frequency and the sum of the frequency of the first local oscillation signal；First signal processing module 13 be used to be filtered the first mixed frequency signal and
Enhanced processing, and the first mixed frequency signal is transmitted to the second frequency mixer 14 by treated；Second local oscillation signal generation module 15 is used
In generating the second local oscillation signal, and the second local oscillation signal is transmitted to the second frequency mixer 14；Second frequency mixer 14 is used for processing
The first mixed frequency signal and the second local oscillation signal afterwards is mixed, and the second mixed frequency signal obtained after mixing is transmitted to second
Signal processing module 16, wherein the frequency of the second mixed frequency signal is equal to the frequency and the first mixed frequency signal of the second local oscillation signal
The difference of frequency；Second signal processing module 16 is for being filtered the second mixed frequency signal and enhanced processing, and after exporting processing
The second mixed frequency signal, and the logical signal of treated the second mixed frequency signal is quantum bit.
In addition, as shown in Fig. 2, the generation system of quantum bit logical signal provided in an embodiment of the present invention further include: adjust
Signal transmitting terminal 17 processed.The modulated signal transmitting terminal 17 is connected with second signal processing module 16, for exporting that treated the
Two mixed frequency signals export the corresponding analog pulse signal of single quantum bit gate operation of required superconductive quantum bit i.e.
Logical signal.Outside line of the analog pulse signal Jing Guo generation system is transmitted to the single quantum bit control of superconductive quantum bit
On channel processed, encoded with the single quantum bit to superconductive quantum bit.
In the present embodiment, baseband signal generation module 10 includes baseband signal maker and first filter.
For baseband signal maker for generating baseband signal, which includes needed for quantum bit gate operation
Modulation coding information.The single quantum bit gate operation of superconductive quantum bit logically corresponds to a rotation process, needs
Rotary shaft and rotation angle accurately determine the type of rotation process.That usual baseband signal maker generates is 200MHz-
The point frequency pulse signal of 800MHz accurately determines rotary shaft by the initial phase of pulse, by the duration of pulse with
And amplitude accurately to determine rotation angle.That is, putting the initial of frequency pulse signal according to what baseband signal maker generated
Modulation coding information needed for phase, duration and amplitude can be obtained quantum bit gate operation.
The high frequency clutter noise in baseband signal that first filter is used to that baseband signal maker to be inhibited to generate, to improve
The quality for the baseband signal that baseband signal maker generates.Wherein, first filter is the subsidiary front end of baseband signal maker
Filter.Optionally, baseband signal maker is arbitrary waveform generator (AWG), in general, AWG has at least sampling of 2GS/s
Vertical resolution more than rate and 12 bytes.Optionally, first filter is the low-pass filter of 1GHz.
Wherein, the baseband signal that baseband signal maker and first filter generate has following form:
AIF(t)=A0(t)coscos(2πfIFt+φIF)
It should be noted that the initial phase of point frequency pulse is manually set.Since the modulation intelligence of pulse is by base band
Signal, which generates and passes through mixing twice, completes modulation, thus the initial phase of quantum bit operating impulse can directly pass through
The adjusting of baseband signal phase is completed herein, by setting the value of φ, that is, can determine the initial phase of baseband signal, also simultaneously really
The initial phase of quantum bit operating impulse is determined.
Duration is then to pass through AIF(t) A in expression formula0(t) it partially determines, it is contemplated that the inherent feature of pulse,
Naturally there is A0(t) it is only not zero within the scope of specific time t, perseverance is zero within the scope of other.That is, this enables A0(t) not
The section t for being zero, that is, the duration of pulse, by be manually set the section t, can determine baseband signal it is lasting when
Between, and then determine the duration of quantum bit operating impulse.
Amplitude is again by A0(t) it determines.In order to ensure only adjusting pulse under the premise of other parameters are constant
Amplitude can directly enable A0(t)=KA0(t), that is to say, that equal proportion increases A0(t) can be realized baseband signal and
The setting of quantum bit operating impulse amplitude.
In the present embodiment, the first local oscillation signal generation module 11 includes the first local oscillator signal generator and the first amplifier,
First local oscillator signal generator is for generating the first local oscillation signal, and the first amplifier is for amplifying place to the first local oscillation signal
Reason.
It should be noted that the first local oscillation signal in the present embodiment is the standing wave signal with single-frequency, frequency
Rate is between 4GHz~8GHz.Optionally, the first local oscillator signal generator is microwave source.In general, the first local oscillation signal generates mould
First local oscillation signal generated of block 11 has following form:
ALO1(t)=A1coscos(2πfLO1t+φLO1)
In the present embodiment, the first frequency mixer 12 is a three port frequency mixers, has the channel LO, the channel IF and RF logical
Road.By the way that baseband signal and the first local oscillation signal are separately input to the channel IF and the channel LO, may be implemented to be mixed for the first time
Process, by the frequency spectrum translation of the first local oscillation signal to (fLO1±fIF) at, wherein fLO1For the frequency of the first local oscillation signal, fIFFor
The frequency of baseband signal.But for quantum bit, we only need (fLO1+fIF) component, without (fLO1-
fIF) component.Meanwhile undesirable frequency mixer is also accompanied by the leakage of a small amount of first local oscillation signal and the leakage of baseband signal.Cause
This, the first frequency mixer 12 in the present embodiment itself can be set to raising (f as far as possibleLO1+fIF) component output weight,
Remaining (fLO1-fIF) component and the first local oscillation signal and baseband signal leak through the first signal processing module 13 to solve
Certainly, i.e., the signal etc. of leakage is filtered out by the first signal processing module 13.
In the present embodiment, the first signal processing module 13 includes first filter array and the first amplifying circuit.First filter
Wave device array is used to filter out the signal except the frequency range of the first required mixed frequency signal, i.e. inhibition is exported from the first frequency mixer 12
Outer clutter noise of the subsidiary leakage signal of signal, image signal and frequency range etc.；First amplifying circuit is used to believe the first mixing
Number processing is amplified, to improve the intensity of useful signal.Optionally, first filter array is switched bandpass filter battle array
Column, with the frequency range being accurately matched to where useful signal；First amplifying circuit is power amplifier-amplifier Cascaded amplification route, preferably
The power amplifier of 4GHz-8GHz-amplifier Cascaded amplification route.
Wherein, the first frequency mixer 12 in the following way couples the first local oscillation signal with baseband signal:
{coscos[2π(fIF+fLO1)t+φIF+φLO1]+coscos[2π(fIF-fLO1)t+φIF-φLO1]}
Wherein, kmix1For the first coupler coupled weight.Since 12 rear class of the first frequency mixer has only through (fLO1+fIF)
Bandpass filter, that is, first filter array, and to (fLO1+fIF) the more sensitive power amplifier of frequency range-amplifier Cascaded amplification route, because
And the form of final signal is as follows:
A1(t)=k1A0(t)coscos[2π(fIF+fLO1)t+φIF+φLO1+Δφ1]+
k2A0(t)coscos[2π(fIF-fLO1)t+φIF-φLO1+Δφ2]
Under the action of first filter array and power amplifier-amplifier Cascaded amplification route, k1/k2>=100, therefore, it is possible to closely
As think
A1(t)≈k1A0(t)coscos[2π(fIF+fLO1)t+φIF+φLO1+Δφ1]
Wherein, k1For gain coefficient, Δ φ1For extra phase shift.
In the present embodiment, the second local oscillation signal generation module 15 includes the second local oscillation signal generator and the second amplifier；
Second local oscillation signal generator is for generating the second local oscillation signal, and the second amplifier is for amplifying place to the second local oscillation signal
Reason.Equally, the second local oscillation signal in the present embodiment is the standing wave signal with single-frequency, and frequency is in 4GHz~8GHz
Between.Optionally, the second local oscillation signal generator is microwave source.In general, the second local oscillation signal generation module 15 generated
Two local oscillation signals have following form:
ALO2(t)=A2coscos(2πfLO2t+φLO2)
In the present embodiment, the second frequency mixer 14 is a three port frequency mixers, has the channel LO, and the channel IF and RF are logical
Road.Pass through the signal (f that will be exported after the first frequency mixer 12 and the first signal processing module 13LO1+fIF) and the second local oscillator
Signal is separately input to the channel IF and the channel LO, and second of optical mixing process may be implemented, by the frequency spectrum translation of the second local oscillation signal
ExtremelyPlace, fLO2For the frequency of the second local oscillation signal.But for quantum bit, we only need
(fLO2-fLO1-fIF) component, without other components.Particularly, pass through base-band signal frequency, the first local oscillator signal frequency
And second local oscillation signal frequency setting, final (fLO2-fLO1-fIF) it is exactly equal to the single quantum bit behaviour of superconductive quantum bit
The frequency of logical signal needed for making.Meanwhile undesirable frequency mixer is also accompanied by the second local oscillation signal and base revealed on a small quantity
Band signal.
In the present embodiment, second signal processing module 15 includes second filter array and the second amplifying circuit；Second filter
Wave device array is used to filter out the signal except the frequency range of the second required mixed frequency signal, i.e. inhibition is exported from the second frequency mixer 14
Outer clutter noise of the subsidiary leakage signal of signal, image signal and frequency range etc.；Second amplifying circuit is used to believe the second mixing
Number processing is amplified, to improve the intensity of useful signal.Optionally, second filter array is all switched bandpass filter
Array, with the frequency range being accurately matched to where useful signal；Second amplifying circuit is all power amplifier-amplifier Cascaded amplification route, excellent
It is selected as power amplifier-amplifier Cascaded amplification route of 4GHz-8GHz.
In general, the second frequency mixer 14 in the following way couples the second local oscillation signal with the first mixed frequency signal:
Wherein, kmix2For the second frequency mixer coupled weight.Since 14 rear class of the second frequency mixer has only through (fLO2-fLO1-
fIF) bandpass filter, that is, second filter array, and to (fLO2-fLO1-fIF) the more sensitive power amplifier of frequency range-amplifier cascade
Amplifying circuit, thus the form of final signal is as follows:
A2(t)=k3A0(t)coscos[2π(fIF+fLO1+fLO2)t+φIF+φLO1+Δφ1+φLO2+Δφ3]+
k4A0(t)coscos[2π(fIF+fLO1-fLO2)t+φIF+φLO1+Δφ1-φLO2+Δφ4]。
Under the action of filter and power amplifier-amplifier Cascaded amplification route, k4/k3>=100, thus can approximatively think
A2(t)≈k4A0(t)coscos[2π(fIF+fLO1-fLO2)t+φIF+φLO1+Δφ1-φLO2+Δφ4]。
Wherein, k4For gain coefficient, Δ φ4For extra phase shift.
Modulated signal transmitting terminal 17 exports final signal, and final signal is to meet superconductive quantum bit
The analog pulse signal of precise frequency needed for single quantum bit operates, phase and amplitude.After completing modulation, final effective tune
The form of signal processed is as follows:
Acontrol(t)=ARF(t)coscos[2πfRFt+φRF]。
It should be noted that 17 output signals of modulated signal transmitting terminal, do not change signal, thus Acontrol(t)=A2
(t), that is to say, that
fRF=| fIF+fLO1-fLO2|
ARF(t)=k4A0(t)
φRF=φIF+φLO1+Δφ1-φLO2+Δφ4=φIF+Δφ
In above three formula, the formula left side is the frequency f of logical signal required for quantum bit operation signalRF, width
Spend ARF(t) and phaseRF, and on the right of formula it is then the corresponding expression formula of the frequency of baseband signal, amplitude and phase.It can
See, as long as entire modulation mixing route is completely fixed, that is to say, that fLO1、fLO2、k4, Δ φ it is constant when, by baseband signal
Modulation, that is, can be completely achieved the modulation to quantum bit operation signal, realize quantum bit quantum logic door operation to logic
The whole of signal require.
In a specific embodiment, what baseband signal generation module 10 generated is the point frequency pulse letter of a 500MHz
Number, initial phase is 90 degree, using Y-axis as the rotation process of rotary shaft in corresponding superconductive quantum bit；Pass through control pulse
Amplitude is 0.2V, duration 25ns, determines that rotation angle is 90 degree counterclockwise.To sum up, the above baseband signal IF is represented
A single quantum bit operation in superconductive quantum bitParticularly, the frequency of IF is 500MHz.
That the first local oscillation signal generation module 11 generates is the first local oscillation signal LO1 that frequency is 3GHz.
First frequency mixer 12 by frequency be 500MHz baseband signal and frequency be 3GHz the first local oscillation signal distinguish
Be input to the channel IF and the channel LO, first time optical mixing process may be implemented, by the frequency spectrum translation of the first local oscillation signal to (3GHz ±
500MHz) place, but for quantum bit in this present embodiment, we only need the component of 3.5GHz.Meanwhile it is undesirable
Frequency mixer be also accompanied by the LO1 signal and IF signal revealed on a small quantity.Therefore, the setting of the first frequency mixer 12 is arrived in the present embodiment
The output weight of 3.5GHz component is improved as far as possible, and mirror image and leakage part are filtered out by the first signal processing module 13.It can
Selection of land uses 3.5GHz to filter all garbage signals for the 100MHz bandpass filter of bandwidth center i.e. first filter array,
Meanwhile ensuring that the semaphore of 3.5GHz component does not lose using power amplifier-amplifier Cascaded amplification route.
Second local oscillation signal generation module 15 generates the second local oscillation signal LO2 that frequency is 10GHz.
The frequency that second frequency mixer 14 exports the first signal processing module 13 be 3.5GHz the first mixed frequency signal and
Frequency is that the second local oscillation signal of 10GHz is separately input to the channel IF and the channel LO, and second of optical mixing process may be implemented, and incite somebody to action this
The frequency spectrum translation of vibration signal is extremelyPlace.But for quantum bit, it is only necessary to the component of 6.5GHz,
Without other components.Particularly, the frequency of target quantum bit is exactly 6.5GHz, thus the signal component of 6.5GHz is just
It is implemented for the single quantum bit operation of the quantum bitTherefore, the second frequency mixer 14 can be arranged to the greatest extent
The output weight of 6.5GHz component may be improved, mirror image and leakage part are filtered out by second signal processing module 16.It is optional
Ground uses 6.5GHz to filter all garbage signals for the 100MHz bandpass filter of bandwidth center i.e. second filter array,
Ensure that the semaphore of 6.5GHz component does not lose using power amplifier-amplifier Cascaded amplification route.
Modulated signal transmitting terminal 17 exports final signal, and final signal is to meet superconductive quantum bit
The analog pulse signal of precise frequency 6.5GHz, phase and amplitude needed for single quantum bit operates, the analog pulse signal energy
Enough accurate realization single quantum bit operations
The generation system of quantum bit logical signal provided by the present invention, the first frequency mixer is to baseband signal and first
Vibration signal is mixed to obtain the first mixed frequency signal, the first signal processing module to the first mixed frequency signal be filtered and amplification at
Reason, the second frequency mixer are mixed to obtain the second mixed frequency signal to treated the first mixed frequency signal and the second local oscillation signal, the
Binary signal processing module is filtered to the second mixed frequency signal and enhanced processing, and treated, and the second mixed frequency signal is quantum ratio
Special logical signal.Compared with prior art, the generation system and method for quantum bit logical signal provided by the invention, not only
The signal leakage generated in modulation mixing and mirror image can be effective filtered out, and can satisfy superconductive quantum bit to single quantum
The high-precision requirement of the frequency of logical signal needed for bit operating, phase and amplitude.
Also, compared with existing orthogonal modulation, the first frequency mixer and the second frequency mixer in the present invention are the mixing of three ports
Device, and the frequency mixer in orthogonal modulation additionally has the channel IQ asymmetric on the basis of three port frequency mixer irrational factors
The flaw of coupling causes the modulation of phase/amplitude nonlinear distortion occur.Thus, the generation system in the present invention is in pulse
There is more excellent linear modulation performance in signal phase modulation, it is precisely arbitrary realizing for superconductive quantum bit
Advantage is had more on single quantum bit gate operation；
It is filtering to the suppressing method of signal leakage and mirror image in the present invention, and orthogonal modulation is to signal leakage and mirror image
Suppressing method is additionally to apply thermal compensation signal in the channel I/Q, and thermal compensation signal needs to occupy additional signal source table resource.It compares
Under, the filtering method more save the cost in the present invention is also more flexible efficient.
The embodiment of the invention also provides a kind of generation methods of quantum bit logical signal, mention applied to embodiment as above
The generation system of the quantum bit logical signal of confession, as shown in Figure 3, comprising:
The baseband signal and the first local oscillation signal generation module that S301: the first frequency mixer generates baseband signal generation module
The first local oscillation signal generated is mixed to obtain the first mixed frequency signal；
S302: the first signal processing module is filtered to first mixed frequency signal and enhanced processing；
S303: the second frequency mixer generates treated first mixed frequency signal and the second local oscillation signal generation module
Second local oscillation signal is mixed to obtain the second mixed frequency signal；
S304: second signal processing module is filtered to second mixed frequency signal and enhanced processing, and exports processing
The second mixed frequency signal afterwards, the logical signal of treated the second mixed frequency signal the is quantum bit.
Specifically, baseband signal generation module generates baseband signal and is transmitted to the channel IF of the first frequency mixer, first
Vibration signal generation module generates the first local oscillation signal and is transmitted to the channel LO of the first frequency mixer, and the first frequency mixer is to baseband signal
It is mixed to obtain the first mixed frequency signal with the first local oscillation signal, and the first mixed frequency signal is transmitted to the first signal processing mould
Block, the first signal processing module is filtered to the first mixed frequency signal and enhanced processing, and the IF for being transmitted to the second frequency mixer is logical
Road, while the second local oscillation signal generation module generates the second local oscillation signal, and is transmitted to the channel LO of the second frequency mixer, second is mixed
Frequency device is mixed to obtain the second mixed frequency signal to treated the first mixed frequency signal and the second local oscillation signal, and is transmitted to second
Signal processing module, second signal processing module is filtered to the second mixed frequency signal and enhanced processing, and treated for output
Second mixed frequency signal, the logical signal of treated the second mixed frequency signal the is quantum bit.Quantum bit logical signal
Generation formula etc. it is same as the previously described embodiments, details are not described herein.
The generation method of quantum bit logical signal provided by the present invention, the first frequency mixer is to baseband signal and first
Vibration signal is mixed to obtain the first mixed frequency signal, the first signal processing module to the first mixed frequency signal be filtered and amplification at
Reason, the second frequency mixer are mixed to obtain the second mixed frequency signal to treated the first mixed frequency signal and the second local oscillation signal, the
Binary signal processing module is filtered to the second mixed frequency signal and enhanced processing, and treated, and the second mixed frequency signal is quantum ratio
Special logical signal.Compared with prior art, the generation system and method for quantum bit logical signal provided by the invention, not only
The signal leakage generated in modulation mixing and mirror image can be effective filtered out, and can satisfy superconductive quantum bit to single quantum
The high-precision requirement of the frequency of logical signal needed for bit operating, phase and amplitude.
Also, compared with existing orthogonal modulation, the first frequency mixer and the second frequency mixer in the present invention are the mixing of three ports
Device, and the frequency mixer in orthogonal modulation additionally has the channel IQ asymmetric on the basis of three port frequency mixer irrational factors
The flaw of coupling causes the modulation of phase/amplitude nonlinear distortion occur.Thus, the generation system in the present invention is in pulse
There is more excellent linear modulation performance in signal phase modulation, it is precisely arbitrary realizing for superconductive quantum bit
Advantage is had more on single quantum bit gate operation；
It is filtering to the suppressing method of signal leakage and mirror image in the present invention, and orthogonal modulation is to signal leakage and mirror image
Suppressing method is additionally to apply thermal compensation signal in the channel I/Q, and thermal compensation signal needs to occupy additional signal source table resource.It compares
Under, the filtering method more save the cost in the present invention is also more flexible efficient.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of generation system of quantum bit logical signal, which is characterized in that including baseband signal generation module, the first local oscillator
Signal generation module, the first frequency mixer, the first signal processing module, the second frequency mixer, the second local oscillation signal generation module and
Binary signal processing module；
The baseband signal generation module inputs first frequency mixer for generating baseband signal, and by the baseband signal,
The baseband signal includes modulation coding information needed for quantum bit gate operation；
The first local oscillation signal generation module for generate the first local oscillation signal, and will first local oscillation signal input described in
First frequency mixer；
First frequency mixer will be obtained for being mixed to the baseband signal and first local oscillation signal after mixing
The first mixed frequency signal be transmitted to first signal processing module；
First signal processing module is used to be filtered first mixed frequency signal and enhanced processing, and by treated
First mixed frequency signal is transmitted to second frequency mixer；
Second local oscillation signal is transmitted to institute for generating the second local oscillation signal by the second local oscillation signal generation module
State the second frequency mixer；
Second frequency mixer is used to be mixed treated first mixed frequency signal and second local oscillation signal, and
The second mixed frequency signal obtained after mixing is transmitted to the second signal processing module；
The second signal processing module is for being filtered second mixed frequency signal and enhanced processing, and after exporting processing
The second mixed frequency signal, and the logical signal of treated the second mixed frequency signal the is quantum bit.
2. system according to claim 1, which is characterized in that the baseband signal generation module includes that baseband signal generates
Device and first filter；
The baseband signal maker is for generating baseband signal；
The high frequency in the baseband signal that the first filter is used to that the baseband signal maker to be inhibited to generate is spuious to make an uproar
Sound.
3. system according to claim 1, which is characterized in that the first local oscillation signal generation module includes the first local oscillator
Signal generator and the first amplifier, for generating the first local oscillation signal, described first puts the first local oscillator signal generator
Big device is for amplifying processing to first local oscillation signal.
4. system according to claim 1, which is characterized in that the second local oscillation signal generation module includes the second local oscillator
Signal generator and the second amplifier；
The second local oscillation signal generator is used for for generating the second local oscillation signal, second amplifier to described second
Vibration signal amplifies processing.
5. system according to claim 1, which is characterized in that first signal processing module includes first filter battle array
Column and the first amplifying circuit,
The first filter array is used to filter out the signal except the frequency range of the first required mixed frequency signal；
First amplifying circuit is for amplifying processing to first mixed frequency signal.
6. system according to claim 5, which is characterized in that the first filter array is switched bandpass filter
Array；
First amplifying circuit is power amplifier-amplifier Cascaded amplification route.
7. system according to claim 1, which is characterized in that the second signal processing module includes second filter battle array
Column and the second amplifying circuit；The second filter array is used to filter out the letter except the frequency range of the second required mixed frequency signal
Number；Second amplifying circuit is for amplifying processing to second mixed frequency signal.
8. system according to claim 7, which is characterized in that the second filter array is switched bandpass filter
Array；
Second amplifying circuit is power amplifier-amplifier Cascaded amplification route.
9. system according to claim 1, which is characterized in that further include: modulated signal transmitting terminal；The modulated signal hair
It penetrates end to be connected with the second signal processing module, is used for output treated the second mixed frequency signal.
10. a kind of generation method of quantum bit logical signal, which is characterized in that be applied to described in any one of claim 1~9
Quantum bit logical signal generation system, comprising:
The baseband signal and the first local oscillation signal generation module that first frequency mixer generates baseband signal generation module generate the
One local oscillation signal is mixed to obtain the first mixed frequency signal；
First signal processing module is filtered to first mixed frequency signal and enhanced processing；
The second local oscillator that second frequency mixer generates treated first mixed frequency signal and the second local oscillation signal generation module
Signal is mixed to obtain the second mixed frequency signal；
Second signal processing module is filtered to second mixed frequency signal and enhanced processing, and it is second mixed to export that treated
Frequency signal, the logical signal of treated the second mixed frequency signal the is quantum bit.
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| CN114528021A (en) * | 2022-01-28 | 2022-05-24 | 中国人民解放军战略支援部队信息工程大学 | Time-sharing multiplexing quantum measurement and control system and low-power-consumption high-efficiency quantum measurement and control compiling method |
| US11960970B2 (en) | 2020-11-12 | 2024-04-16 | International Business Machines Corporation | Strategic pausing for quantum state leakage mitigation |
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