CN110311289A - Microwave phase locking method and device is tangled in a kind of path - Google Patents
Microwave phase locking method and device is tangled in a kind of path Download PDFInfo
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Abstract
The present invention relates to a kind of paths to tangle microwave phase locking method and corresponding intrument, it is by pumping source, microwave source, Josephson's parameter amplifier, circulator/isolator, 180 ° of mixing rings, Wilkinson power divider, filter, phase shifter, microwave phase converter etc. is constituted, mainly by carrying out Spatial transmission to classical microwave signal all the way, and the single-mode squeezing state microwave field comprising Spatial transmission information is generated using Josephson's parameter amplifier, Frequency mixing processing is carried out to the single-mode squeezing state microwave field and the microwave signal of tangling all the way of generation, extract the opposite phase information between modulated signal analysis single-mode squeezing state microwave field, it will be with respect to phase locking in pi/2 using PID circuit, this invention simplifies the system complexities that signal source is tangled in path, improve the benefit that microwave preparation is tangled in path, it improves path and tangles microwave signal Application power, can be used as quantum techniques and prepare the industrialization scheme that microwave signal is tangled in path in conjunction with classical system.
Description
Technical field
The present invention relates to paths to tangle microwave technical field, and in particular to a kind of phase locking skill of squeezed state microwave field
Art.
Background technique
The phase locking technology of squeezed state microwave field tangles microwave with highly important meaning for preparation high quality path
Justice.Based on Josephson's parameter amplifier (JPA) and 180 ° of mixing rings to tangle microwave preparation method micro- for single-mode squeezing
Locking between wave field with respect to position phase proposes very high requirement, when opposite position phase and calibration value generation deviation, it will so that
The degree of compression that microwave is tangled in path reduces, and tangles quality reduction, this will make path tangle signal maximum transmitted in the application
Distance reduces, signal detection difficulty increases, the serious application performance for restricting path and tangling microwave.
Current squeezed state microwave field phase locking scheme mainly utilizes quantum layer analysis and state reconfiguration technique to resolve position phase
Information and then the opposite position phase of locking, however the system circuit design is complicated and data processing amount is big, real-time is difficult to ensure, nothing
Method reaches the standard that microwave is tangled in preparation of industrialization path.Although quantum chromatography and state reconfiguration technique are for quantum signal
There are some superiorities for detection, but seriously increase system complexity.
Path is tangled microwave and is all showed in terms of quantum communications, quantum information processing and quantum radio
Locate preferable application prospect, this also tangles the preparation of microwave signal to path, and more stringent requirements are proposed.It is opened by mimicry physics
Hair, is combined using the physical system based on classical technology with the preparation that microwave signal is tangled in path, is expected to promotion path and is tangled
The performance of microwave signal, however do not occur relevant research also at present, phase locking technology largely all also focuses on quantum layer
Analysis and state reconfiguration technique, and the technology is not bery mature in microwave regime.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of path and tangles microwave phase locking device, including pump
Pu source, Josephson's parameter amplifier, microwave source, circulator/isolator, Wilkinson power divider, 180 ° of mixing rings, amplifier,
Filter, phase shifter, frequency mixer, PID control circuit, microwave phase converter and modulating signal source, it is characterised in that: pumping source 1 is defeated
End is pumped to Josephson's parameter amplifier 1 out；Microwave source 1 is exported by circulator/isolator 1 to Josephson's parameter amplifier
1 signal end；1 signal end of Josephson's parameter amplifier is exported by circulator/isolator 1 to Wilkinson power divider 1；Weir gold
Gloomy 1 one tunnel of power splitter exports E1To 180 ° of ports mixing ring B, E is exported all the way1' to amplifier 2；Amplifier 2 is exported to filter
2, the output of filter 2 to phase shifter 3, the output of phase shifter 3 to frequency mixer 1；Pumping source 2 is exported to 2 input terminal of phase shifter, phase shift
The output of device 2 to Josephson's parameter amplifier 2 pumps end；Microwave source 2 is exported to microwave phase converter input terminal；Modulating signal source
It is exported all the way to microwave phase converter phase modulation end, is exported all the way to phase shifter 1；Microwave phase converter is exported extremely by circulator/isolator 2
2 signal end of Josephson's parameter amplifier, 2 signal end of Josephson's parameter amplifier export E by circulator/isolator2Extremely
180 ° of ports mixing ring A；180 ° of mixing ring C ports export E3E is exported to 2,180 ° of mixing ports ring D of Wilkinson power divider4
To device；2 one tunnel of Wilkinson power divider exports E5' to amplifier 1, E is exported all the way5To device；Amplifier 1 is defeated
Out to filter 1, the output of filter 1 to frequency mixer 1；Frequency mixer 1 exports Sm1To filter 3, filter 3 exports S 'm1It is extremely mixed
Frequency device 2, frequency mixer 2 export S through wave filter 4m2To PID control circuit, PID control circuit output ScIt is controlled to phase shifter 2
End.
Further, phase shifter 3 isPhase shifter, filter 1 and filter 2 are bandpass filter, filter 3 and filtering
Device 4 is low-pass filter.
Further, the resonance frequency of Josephson's parameter amplifier is ω0=5.788GHz；Pumping source generates ωp=2
ω0Signal；The Spatial transmission signal of modulating signal source generation 30MHz；It mutually adjusts the position that modulating signal source generates Ω=30MHz
Signal processed；Microwave source uses SLFS12A microwave analog signal generator；180 ° of mixing rings use CPL-5850-100-SMA；It puts
Big device uses LNF-LNC4-8C；Circulator/isolator uses LNF-ISC4-8A；Phase shifter 1 uses MPS-DC1G-360-S；Phase shift
Device 2 uses CVPS-4G8G-360；Frequency mixer 1 uses MT3-0113LCOG；Frequency mixer 2 uses T3-12；Wilkinson power divider
Using PD-0109；Bandpass filter uses TBF-5780-100-C7, centre frequency 5.788GHz, bandwidth 100MHz；Low pass filtered
The customization of wave device, cutoff frequency 50MHz.
The present invention also provides a kind of paths to tangle microwave phase locking method, tangles microwave phase locking using above-mentioned path
Device, comprising:
Step 1, pumping source 1 and pumping source 2 generate ω respectivelyp=2 ω0Signal driving Josephson's parameter amplifier 1 with
Josephson's parameter amplifier 2 is in ω0Locate resonance, signal source 1 generates ω0Signal injection Josephson's parameter amplifier 1 believe
Number port, while the Spatial transmission signal that modulating signal source generates injects microwave phase converter, signal source 2 generates ω0Signal warp
2 signal port of Josephson's parameter amplifier is injected after crossing Spatial transmission；
Step 2, Josephson's parameter amplifier 1 export single-mode squeezing state microwave field all the way and pass through Wilkinson power divider
Two-way is divided the signal into, wherein E all the way1Inject 180 ° of mixing rings, another way E '1Reference signal as PGC demodulation；Simultaneously
Josephson's parameter amplifier 2 generates single-mode squeezing state microwave field E all the way2It is injected into 180 ° of mixing rings；
Step 3, E2With E1Constructive interference occurs for the output port C that ring is mixed at 180 °, and in port, destructive interference, C occur for D
Port output signal is divided into two-way through Wilkinson power divider, wherein E all the way5It tangles with D port output signal as path micro-
The output of wave source, another way E '5Contain opposite phase information θ；
Step 4, E '1With E '5It is amplified respectively through amplifier group, and through bandpass filter, filters out high-frequency signal and band
Outer noise；
Step 5, to the E ' after amplification and filtering processing1Phase shiftAnd with E '5It is mixed, output signal Sm1Through low
Bandpass filter rejection frequency is higher than the signal of Ω, obtains signal S 'm1；
The modulated signal that step 6, modulating signal source generateWith signal S 'm1It is mixed, low-pass filtered device
Signal of the rejection frequency higher than Ω obtains Sm2, which is frequency discrimination signal of the single-mode squeezing state microwave field with respect to phase locking；
Step 7, control phase shifter 2 make pumping source 2 specifically to frequency scan pump signal position phase, and adjustment phase shifter 1 makes
Obtain signal Sm2Frequency discrimination curve maximum intensity, at this timeFrequency discrimination signal is reduced to
Step 8 stops the signal generating to pumping source 2 progress position scanning phase, connection PID control circuit and phase shifter 2, warp
S after low-pass filteringm2Error signal as PID control circuit；
The error signal S of step 9, opposite position phasem2The voltage control signal S generated through PID control circuitcIt is output to phase shifter 2,
Pumping position is mutually adjusted；
Step 10, continuation steps 9, so that single-mode squeezing state is mutually remained at respect to position
Further, ω0=5.788GHz, pumping source 2 is with the frequency scanning pump signal position phase of 20Hz, Ω=30MHz.
This invention simplifies the system complexities that signal source is tangled in path, improve the benefit that microwave preparation is tangled in path,
Improve the application power that microwave signal is tangled in path.
Detailed description of the invention
Fig. 1 is Josephson's parameter amplifier internal circuit configuration figure；
Fig. 2 is Josephson's parameter amplifier working principle diagram；
Fig. 3 is 180 ° of mixing ring working principle diagrams；
Fig. 4 is that Josephson's parameter amplifier and 180 ° of mixing rings prepare the schematic diagram that microwave is tangled in path；
Fig. 5 is single-mode squeezing state microwave field phase locking device composite structural diagram in the present invention；
Fig. 6 is PID control circuit locking means flow chart in the present invention.
Specific embodiment
To keep the purpose of the present invention, technical solution and advantage more apparent, with reference to the accompanying drawings and examples, to this hair
It is bright to be further elaborated.
Josephson's parameter amplifier (JPA) that the present invention uses is a kind of phase-sensitive amplifier (Phase-Sensitive
Amplifier), can by magnetic flux drive work in parameter amplification mode, specific configuration as shown in Figure 1, mainly by pumping line,
DC superconducting quantum inteferometer (Superconducting quantum interference device, SQUID), transmission line
Resonator and direct current flux biasing composition.Its working principle is as shown in Fig. 2, it is 2 ω that pumping source, which generates a frequency,0Letter
Number injection Josephson's parameter amplifier so that DC superconducting quantum inteferometer ring in generate a cycle variation magnetic flux, into
And cause transmission-line efficiency resonance.When Josephson's parameter amplifier signal end input frequency is ω0The microwave signal of-ω,
It is ω that a frequency can be generated simultaneously0+ ω idler, wherein A indicates the intensity of input signal, and G and M respectively represent ω0-ω
And ω0The gain of two signal of+ω, GA and MA indicate signal strength.When Josephson's parameter amplifier works under degeneracy parameter
When translative mode, ω=0, output signal is single-mode squeezing state microwave field.
The process that Josephson's parameter amplifier prepares single-mode squeezing state microwave field can be indicated with Hamiltonian:
Wherein i is that the imaginary number in mathematics indicates,It is normalized planck constant, it is the defeated of ω that a, which is expressed as input frequency,
Enter signal light field；θreIndicate the opposite phase difference of pump light and signal light；χ(2)It is related with second-order nonlinear polarizability, it is real
Number.It enablesThen Time-evolution Operator are as follows:
ξ=2t η is enabled again, then squeezing operator is are as follows:
Enable r=2t χ(2)It is expressed as compression width, θreIt is expressed as compression angle.It follows that control input signal is constant, change
The compression angle of the whole output signal of JPA pump signal phase-adjustable meets relational expression Δ θre∝Δθpump, wherein θpumpIt indicates
The position phase of pumping, Δ indicate deviation, i.e. θreThe variable be proportional to θpumpThe variable.
180 ° of mixing ring working principles used in the present invention are as shown in Figure 3.180 ° of mixing rings are by a loop and four
Signal port composition, wherein input port is A, B, output port C, D.Two-way is defeated through the port A, B respectively with frequency microwave signal
Enter and generates interference effect in ring.Wherein the signal of the port A input generates 180 ° of phase difference in the port C, D, and the port B is defeated
The signal entered is generated in the port C, D with mutually exporting, i.e., input signal is respectively constructive interference and destructive interference in the port C, D, this
Microwave is tangled in the path that structure can be used for generating frequencies into degeneration.
Microwave generator is tangled by pumping source, microwave source, Josephson's parameter amplifier, annular isolation in common path
Device and 180 ° of mixing rings are constituted, and are pumped as shown in figure 4, pumping source 1 exports pump signal 1 to Josephson's parameter amplifier 1
End, the input signal 1 that microwave source 1 exports input 1 signal end of Josephson's parameter amplifier, Joseph by circulator/isolator 1
The signal end of gloomy parameter amplifier 1 is exported by circulator/isolator 1 to 180 ° of ports mixing ring B；The output pumping letter of pumping source 2
Numbers 2 pump end to Josephson's parameter amplifier 2, and the input signal 2 that microwave source 2 exports inputs about plucked instrument by circulator/isolator 2
Gloomy 2 signal end of parameter amplifier of husband, the signal end of Josephson's parameter amplifier 2, which is exported by circulator/isolator 2 to 180 °, to be mixed
The port cyclization A；180 ° of mixing ring C, D port output signals have path Entanglement.The amplification of two of them Josephson's parameter
Device resonance frequency is identical, is ω0, it is ω that two pumping sources, which generate frequency,p=2 ω0Signal function in corresponding Joseph
Gloomy parameter amplifier, it is ω that two microwave sources, which generate frequency,0Signal inject corresponding Josephson's parameter amplifier parameter occur
Lower conversion exports as single-mode squeezing state microwave field, is mutually pi/2 by the opposite position of two-way single-mode squeezing state microwave field control, and injects
180 ° of mixing ports ring A, B generate interference, and the output of the port C, D is that microwave signal is tangled in the path of frequencies into degeneration.
On the basis of Josephson's parameter amplifier and 180 ° of mixing ring preparation paths tangle microwave, the present invention is proposed
A kind of single-mode squeezing state microwave field phase locking device, composition as shown in figure 5, the output of pumping source 1 to Josephson's parameter
Amplifier 1 pumps end；Microwave source 1 is exported by circulator/isolator 1 to 1 signal end of Josephson's parameter amplifier；Josephson
1 signal end of parameter amplifier is exported by circulator/isolator 1 to Wilkinson power divider 1；1 one road of Wilkinson power divider is defeated
E out1To 180 ° of ports mixing ring B, E is exported all the way1' to amplifier 2；Amplifier 2 is exported to bandpass filter 2, bandpass filter
2 outputs are extremelyPhase shifter,Phase shifter is exported to frequency mixer 1；The output of pumping source 2 to 2 input terminal of phase shifter, phase shifter 2 exports
End is pumped to Josephson's parameter amplifier 2；Microwave source 2 is exported to microwave phase converter input terminal；Modulating signal source exports all the way
To microwave phase converter phase modulation end, exported all the way to phase shifter 1；Microwave phase converter is exported by circulator/isolator 2 to Josephson
2 signal end of parameter amplifier, 2 signal end of Josephson's parameter amplifier export E by circulator/isolator2To 180 ° of mixing ring A
Port；180 ° of mixing ring C ports export E3E is exported to 2,180 ° of mixing ports ring D of Wilkinson power divider4To device,
The path 1 of microwave is tangled as path；2 one tunnel of Wilkinson power divider exports E5' to amplifier 1, E is exported all the way5To device
Outside tangles the path 2 of microwave as path；The output of amplifier 1 to bandpass filter 1, the output of bandpass filter 1 is extremely mixed
Device 1；Frequency mixer 1 exports Sm1To low-pass filter 1, low-pass filter 1 exports S 'm1To frequency mixer 2, frequency mixer 2 passes through low pass
Filter 2 exports Sm2To PID control circuit, PID control circuit output ScTo 2 control terminal of phase shifter.
The Spatial transmission signal that modulating signal source generates Ω is exported to microwave phase converter, to Josephson's parameter amplifier 2
Input signal carry out Spatial transmission, the amplitude of single-mode squeezing state microwave field that Josephson's parameter amplifier 2 exports can indicate
Are as follows:
E2=A2cos(ω0t+msinΩt) (4)
When not considering the secondary and higher order harmonics of Spatial transmission generation, it is unfolded using first-order bessel function:
E2≈A2[J0(m)cosω0t+J1(m)cos(ω0+Ω)t-J1(m)cos(ω0-Ω)t] (5)
Josephson's parameter amplifier 1 generates single-mode squeezing state microwave field all the way and through 1 function of Wilkinson power divider is divided into two
Road signal E1With E1', amplitude may be expressed as:
E1=E1'=A1cosω0t (6)
Wherein E1The single-mode squeezing state microwave field E generated with Josephson's parameter amplifier 22In 180 ° of mixing ring internal interferences,
Outgoing route tangles signal E3With E4, Wilkinson power divider is to signal function point and will not destroy its Entanglement.It is assumed that two-way
The opposite position of single-mode squeezing state microwave field is mutually θ, then E3It may be expressed as:
Using Wilkinson power divider by E3Function is divided into two-way E5And E5', E at this time4With E5Microwave signal is tangled as path
The output in source, and E5' and E1' amplified and be filtered and demodulate phase modulated signal through frequency mixer:
The AC signal for staying frequency to be not more than Ω is handled after low-pass filter, therefore Sm1It can simplify are as follows:
The signal contains the opposite position phase between two-way single-mode squeezing state microwave field.
The Spatial transmission signal that modulating signal source generatesBy phase shifter 1 and S 'm1It is sent into frequency mixer simultaneously,
Wherein phase shifter adjustment modulating signal source and S 'm1Opposite position be mutuallyThe low-pass filtered device rejection frequency of mixed frequency signal is greater than
The signal of Ω obtains
The output is locking two-way single-mode squeezing state microwave field with respect to the frequency discrimination signal of position phase, will be with respect to phase lockingWork as adjustingWhen, Sm2Frequency discrimination curve maximum intensity.
The invention also provides a kind of single-mode squeezing state microwave field phase locking methods, comprising:
Step 1, pumping source 1 and pumping source 2 generate ω respectivelyp=2 ω0Signal driving Josephson's parameter amplifier 1 with
Josephson's parameter amplifier 2 is in ω0Locate resonance, signal source 1 generates ω0Signal injection Josephson's parameter amplifier 1 believe
Number port, while the Spatial transmission signal that modulating signal source generates injects microwave phase converter, signal source 2 generates ω0Signal warp
JPA2 signal port is injected after crossing Spatial transmission；
Step 2, JPA1 export single-mode squeezing state microwave field all the way and divide the signal into two-way by Wilkinson power divider,
Wherein E all the way1Inject 180 ° of mixing rings, another way E1' the reference signal as PGC demodulation.JPA2 generates single mode all the way simultaneously
Squeezed state microwave field E2It is injected into 180 ° of mixing rings；
Step 3, E2With E1Constructive interference occurs for the output port C that ring is mixed at 180 °, and in port, destructive interference, C occur for D
Port output signal is divided into two-way through Wilkinson power divider, wherein E all the way5It tangles with D port output signal as path micro-
The output of wave source, another way E '5Contain opposite phase information θ；
Step 4, E '1With E '5It is amplified respectively through amplifier group, and through bandpass filter, filters out high-frequency signal and band
Outer noise；
Step 5, to the E ' after amplification and filtering processing1Phase shiftAnd with E '5It is mixed, output signal Sm1Through low
Bandpass filter rejection frequency is higher than the signal of Ω；
The modulated signal that step 6, modulating signal source generateWith signal Sm1It is mixed, obtains Sm2, the signal
Frequency discrimination signal for single-mode squeezing state microwave field with respect to phase locking；
Step 7, control phase shifter 2 make pumping source 2 specifically to frequency scan pump signal position phase, and adjustment phase shifter 1 makes
Obtain signal Sm2Frequency discrimination curve maximum intensity, at this timeFrequency discrimination signal is reduced to
Step 8 stops the signal generating to pumping source 2 progress position scanning phase, connection PID control circuit and phase shifter 2, warp
S after low-pass filteringm2Error signal as PID control circuit；
The error signal S of step 9, opposite position phasem2The voltage control signal S generated through PID control circuitcIt is output to phase shifter 2,
Pumping position is mutually adjusted；
Step 10, continuation steps 9, so that single-mode squeezing state is mutually remained at respect to position
Error signal can be locked near zero by PID control circuit, i.e. the opposite position of single-mode squeezing state microwave field is mutually locked
It is scheduled onIts workflow is as shown in Figure 6.Since the unstable and noise jamming of power generates the most value of frequency discrimination signal
Fluctuation, therefore be difficult to lock its most value point using PID control circuit, therefore step 5 is to E '1Make phase shiftProcessing, so that opposite position
Xiang WeiWhen frequency discrimination signal be zero, avoid the unstable to opposite phase error signal true value of frequency discrimination signal amplitude
It influences.
In one particular embodiment of the present invention, the resonance frequency of Josephson's parameter amplifier is ω0=
5.788GHz；Pumping source generates ωp=2 ω0Signal；The Spatial transmission signal that modulating signal source generates 30MHz injects microwave
Phase converter；Pumping source 2 is with the frequency scanning pump signal position phase of 20Hz；The Spatial transmission of modulating signal source generation Ω=30MHz
Signal；The SLFS12A microwave analog signal generator that microwave source is produced using culminant star connection China Tech skill (Beijing) Co., Ltd
(1MHz-12GHz), generation frequency are ω0Signal；180 ° of mixing rings use the CPL- of MITEQ Estonia company production
5850-100-SMA；Amplifier uses the LNF-LNC4-8C of Low Noise Factory production；Circulator/isolator uses Low
The LNF-ISC4-8A of Noise Factory production；The MPS- that phase shifter 1 is produced using Commphy Microwave company
DC1G-360-S；The CVPS-4G8G-360 that phase shifter 2 is produced using Commphy Microwave company；Frequency mixer 1 uses
The MT3-0113LCOG of Marki Microwave company production；Frequency mixer 2 is using the production of Marki Microwave company
T3-12；Wilkinson power divider uses the PD-0109 of Marki Microwave company production；Bandpass filter uses Suzhou
The TBF-5780-100-C7, centre frequency 5.788GHz, bandwidth 100MHz of Tai Lai microwave technology Co., Ltd production；Low pass filtered
Wave device is quasi- to be customized by Suzhou Tai Lai microwave technology Co., Ltd, cutoff frequency 50MHz.
Squeezed state microwave field phase locking method proposed by the invention, the effective integration Nonclassical Properties of quantum techniques
And the Stability and dependability of classical system, the compression during realizing and Entanglement are not only remained, but also will be relatively difficult to achieve
Quantum chromatography and state reconfiguration technique be converted into the detection for classical signals, guarantee tangle performance under the premise of greatly
System complexity is simplified, is conducive to preparation of industrialization path and tangles microwave.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention
Within the scope of shield.
Claims (5)
1. microwave phase locking device, including pumping source, Josephson's parameter amplifier, microwave source, annular are tangled in a kind of path
Isolator, Wilkinson power divider, 180 ° of mixing rings, amplifier, filter, phase shifter, frequency mixers, PID control circuit, microwave
Phase converter and modulating signal source, it is characterised in that: the output of pumping source 1 to Josephson's parameter amplifier 1 pumps end；Microwave source 1
Pass through the output of circulator/isolator 1 to 1 signal end of Josephson's parameter amplifier；1 signal end of Josephson's parameter amplifier passes through
Circulator/isolator 1 is exported to Wilkinson power divider 1；1 one tunnel of Wilkinson power divider exports E1To 180 ° of ports mixing ring B,
E is exported all the way1' to amplifier 2；The output of amplifier 2 to filter 2, the output of filter 2 to phase shifter 3, phase shifter 3 exports extremely
Frequency mixer 1；The output of pumping source 2 to 2 input terminal of phase shifter, the output of phase shifter 2 to Josephson's parameter amplifier 2 pumps end；It is micro-
Wave source 2 is exported to microwave phase converter input terminal；Modulating signal source is exported all the way to microwave phase converter phase modulation end, all the way output to shifting
Phase device 1；Microwave phase converter is exported by circulator/isolator 2 to 2 signal end of Josephson's parameter amplifier, and Josephson's parameter is put
Big 2 signal end of device exports E by circulator/isolator2To 180 ° of ports mixing ring A；180 ° of mixing ring C ports export E3To Weir gold
2,180 ° of mixing ports ring D of gloomy power splitter export E4To device；2 one tunnel of Wilkinson power divider exports E5' to amplifier 1,
E is exported all the way5To device；The output of amplifier 1 to filter 1, filter 1 is exported to frequency mixer 1；Frequency mixer 1 exports Sm1
To filter 3, filter 3 exports S 'm1To frequency mixer 2, frequency mixer 2 exports S through wave filter 4m2To PID control circuit, PID
Control circuit exports ScTo 2 control terminal of phase shifter.
2. microwave phase locking device is tangled in a kind of path as described in claim 1, it is characterised in that: phase shifter 3 isIt moves
Phase device, filter 1 and filter 2 are bandpass filter, and filter 3 and filter 4 are low-pass filter.
3. microwave phase locking device is tangled in a kind of path as claimed in claim 2, it is characterised in that: Josephson's parameter is put
The resonance frequency of big device is ω0=5.788GHz；Pumping source generates ωp=2 ω0Signal；Modulating signal source generates 30MHz's
Spatial transmission signal；The Spatial transmission signal of modulating signal source generation Ω=30MHz；Microwave source is simulated using SLFS12A microwave
Signal generator；180 ° of mixing rings use CPL-5850-100-SMA；Amplifier uses LNF-LNC4-8C；Circulator/isolator is adopted
Use LNF-ISC4-8A；Phase shifter 1 uses MPS-DC1G-360-S；Phase shifter 2 uses CVPS-4G8G-360；Frequency mixer 1 uses
MT3-0113LCOG；Frequency mixer 2 uses T3-12；Wilkinson power divider uses PD-0109；Bandpass filter uses TBF-
5780-100-C7, centre frequency 5.788GHz, bandwidth 100MHz；Low-pass filter customization, cutoff frequency 50MHz.
4. microwave phase locking method is tangled in a kind of path, device as described in claim 2 is used, comprising:
Step 1, pumping source 1 and pumping source 2 generate ω respectivelyp=2 ω0Signal driving Josephson's parameter amplifier 1 and about plucked instrument
The gloomy parameter amplifier of husband 2 is in ω0Locate resonance, signal source 1 generates ω0Signal inject 1 signal end of Josephson's parameter amplifier
Mouthful, while the Spatial transmission signal that modulating signal source generates injects microwave phase converter, signal source 2 generates ω0Signal by position
2 signal port of Josephson's parameter amplifier is injected after mutually modulating；
Step 2, Josephson's parameter amplifier 1 export single-mode squeezing state microwave field all the way and will be believed by Wilkinson power divider
Number it is divided into two-way, wherein E all the way1Inject 180 ° of mixing rings, another way E '1Reference signal as PGC demodulation；Joseph simultaneously
Gloomy parameter amplifier 2 generates single-mode squeezing state microwave field E all the way2It is injected into 180 ° of mixing rings；
Step 3, C port output signal are divided into two-way through Wilkinson power divider, wherein E all the way5With D port output signal conduct
The output of microwave source, another way E ' are tangled in path5Contain opposite phase information θ；
Step 4, E '1With E '5It is amplified respectively through amplifier group, and through bandpass filter, filters out high-frequency signal and with making an uproar outside
Sound；
Step 5, to the E ' after amplification and filtering processing1Phase shiftAnd and E5' be mixed, output signal Sm1It is low-pass filtered
Device rejection frequency is higher than the signal of Ω, obtains signal S 'm1；
The modulated signal that step 6, modulating signal source generateWith signal S 'm1It is mixed, low-pass filtered device filters out
Signal of the frequency higher than Ω obtains Sm2, which is frequency discrimination signal of the single-mode squeezing state microwave field with respect to phase locking；
Step 7, control phase shifter 2 make pumping source 2 specifically to frequency scan pump signal position phase, and adjustment phase shifter 1 makes letter
Number Sm2Frequency discrimination curve maximum intensity；
Step 8 stops the signal generating to pumping source 2 progress position scanning phase, connection PID control circuit and phase shifter 2, through low pass
Filtered Sm2Error signal as PID control circuit；
The error signal S of step 9, opposite position phasem2The voltage control signal S generated through PID control circuitcIt is output to phase shifter 2, to pump
Pu position is mutually adjusted；
Step 10, continuation steps 9, so that single-mode squeezing state is mutually remained at respect to position
5. microwave phase locking method is tangled in a kind of path as claimed in claim 4, it is characterised in that: ω0=5.788GHz,
Pumping source 2 is with the frequency scanning pump signal position phase of 20Hz, Ω=30MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910613481.6A CN110311289B (en) | 2019-07-09 | 2019-07-09 | Path entanglement microwave phase locking method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910613481.6A CN110311289B (en) | 2019-07-09 | 2019-07-09 | Path entanglement microwave phase locking method and device |
Publications (2)
| Publication Number | Publication Date |
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| CN110311289A true CN110311289A (en) | 2019-10-08 |
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| CN116015219A (en) * | 2023-01-17 | 2023-04-25 | 清华大学 | Josephson parametric amplifier |
| CN117332863A (en) * | 2023-09-07 | 2024-01-02 | 中国科学技术大学 | Method for calibrating and optimizing a parametric amplifier |
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| CN117332863A (en) * | 2023-09-07 | 2024-01-02 | 中国科学技术大学 | Method for calibrating and optimizing a parametric amplifier |
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