CN110311289A - Method and device for path entangled microwave phase locking - Google Patents

Abstract

The invention relates to a path-entangled microwave phase locking method and a corresponding device, which consists of a pump source, a microwave source, a Josephson parametric amplifier, a ring isolator, a 180° hybrid ring, a Wilkinson power divider, a filter, and a phase shifter It is mainly composed of a classical microwave signal by phase modulation, and using a Josephson parametric amplifier to generate a single-mode compressed microwave field containing phase modulation information. The single-mode compressed microwave field and the generated One path of entangled microwave signals is subjected to frequency mixing processing, the modulated signal is extracted to analyze the relative phase information between single-mode compressed microwave fields, and the relative phase is locked at π/2 by using a PID circuit. The present invention simplifies the system complexity of path entangled signal sources, It improves the benefits of path-entangled microwave preparation and enhances the application capability of path-entangled microwave signals. It can be used as an industrialized solution for preparing path-entangled microwave signals by combining quantum technology and classical systems.

Description

Method and device for path entangled microwave phase locking

technical field

The invention relates to the technical field of path entanglement microwaves, in particular to a phase locking technology of a compressed state microwave field.

Background technique

The phase-locking technology of squeezed microwave field is of great significance for the preparation of high-quality path-entangled microwaves. The entangled microwave preparation scheme based on the Josephson parametric amplifier (JPA) and the 180° hybrid ring puts forward high requirements for the relative phase locking between the single-mode compressed microwave fields. When the relative phase deviates from the calibration value, it will make The compression degree of path-entangled microwave decreases, and the quality of entanglement decreases, which will reduce the maximum transmission distance of path-entangled signals in applications and increase the difficulty of signal detection, which seriously restricts the application performance of path-entangled microwaves.

The current phase locking scheme of the compressed state microwave field mainly uses quantum tomography and state reconstruction technology to solve the phase information and then lock the relative phase. However, the circuit design of this system is complex and the data processing volume is large, and the real-time performance is difficult to guarantee. The standard for entangled microwaves. Although quantum tomography and state reconstruction techniques have certain advantages for the detection of quantum signals, they seriously increase the complexity of the system.

Path-entangled microwaves have good application prospects in quantum communication, quantum information processing, and quantum radio navigation technology, which also puts forward higher requirements for the preparation of path-entangled microwave signals. Inspired by mimic physics, it is expected to improve the performance of path-entangled microwave signals by combining the physical system based on classical technology with the preparation of path-entangled microwave signals. Quantum tomography and state reconstruction technology, and this technology is not very mature in the microwave field.

Contents of the invention

In order to overcome the deficiencies in the prior art, the present invention provides a path-entangled microwave phase locking device, including a pump source, a Josephson parametric amplifier, a microwave source, a ring isolator, a Wilkinson power divider, a 180° hybrid ring, an amplifier , filter, phase shifter, mixer, PID control circuit, microwave phase modulator and modulation signal source, characterized in that: pump source 1 is output to the pump end of Josephson parametric amplifier 1; microwave source 1 is isolated by ring The signal terminal of Josephson parametric amplifier 1 is output to Josephson parametric amplifier 1; the signal terminal of Josephson parametric amplifier 1 is output to Wilkinson power divider 1 through ring isolator 1; one output of Wilkinson power divider 1 is E ₁ to 180° hybrid ring B port, one output E ₁ 'to amplifier 2; amplifier 2 output to filter 2, filter 2 output to phase shifter 3, phase shifter 3 output to mixer 1; pump source 2 output to phase shifter 2 input terminals, phase shifter 2 output to Josephson parametric amplifier 2 pump terminal; microwave source 2 output to microwave phase modulator input terminal; one output of modulation signal source to microwave phase modulator phase modulation terminal, one output to phase shifter 1; the microwave phase modulator outputs to the Josephson parametric amplifier 2 signal terminal through the ring isolator 2, and the Josephson parametric amplifier 2 signal terminal outputs the E ₂ to the 180° hybrid ring A port through the ring isolator; the 180° hybrid ring C port Output E ₃ to Wilkinson power splitter 2, 180° hybrid ring D port output E ₄ to the outside of the device; Wilkinson power splitter 2 one output E ₅ ′ to amplifier 1, one output E ₅ to the device outside; amplifier 1 output to filter 1, filter 1 output to mixer 1; mixer 1 output S _m1 to filter 3, filter 3 output S' _m1 to mixer 2, mixer 2 through filter 4 The output S _m2 is sent to the PID control circuit, and the output S _c of the PID control circuit is sent to the control terminal of the phase shifter 2 .

Further, the phase shifter 3 is Phase shifter, filter 1 and filter 2 are band-pass filters, filter 3 and filter 4 are low-pass filters.

Further, the resonance frequency of the Josephson parametric amplifier is ω ₀ =5.788GHz; the pump source generates a signal of ω _p =2ω ₀ ; the modulation signal source generates a phase modulation signal of 30MHz; the modulation signal source generates a phase modulation signal of Ω=30MHz ;The microwave source adopts SLFS12A microwave analog signal generator; the 180° hybrid ring adopts CPL-5850-100-SMA; the amplifier adopts LNF-LNC4-8C; the ring isolator adopts LNF-ISC4-8A; the phase shifter 1 adopts MPS-DC1G -360-S; CVPS-4G8G-360 for phase shifter 2; MT3-0113LCOG for mixer 1; T3-12 for mixer 2; PD-0109 for Wilkinson power splitter; TBF-5780-100-C7, center frequency 5.788GHz, bandwidth 100MHz; customized low-pass filter, cutoff frequency 50MHz.

The present invention also provides a method for path-entangled microwave phase locking, using the above-mentioned path-entangled microwave phase-locking device, including:

Step 1. Pumping source 1 and pumping source 2 generate signals of ω _p = 2ω ₀ respectively to drive Josephson parametric amplifier 1 and Josephson parametric amplifier 2 to resonate at ω ₀ , and signal source 1 generates a signal of ω ₀ to inject into Josephson Parametric amplifier 1 signal port, while the phase modulation signal generated by the modulation signal source is injected into the microwave phase modulator, and the signal of ω ₀ generated by signal source 2 is injected into the Josephson parametric amplifier 2 signal port after phase modulation;

Step 2, Josephson parametric amplifier 1 outputs a single-mode compressed microwave field and divides the signal into two paths through a Wilkinson power divider, wherein one path E ₁ is injected into the 180° hybrid ring, and the other path E′ ₁ is used as a reference for phase locking signal; at the same time, Josephson parametric amplifier 2 generates a single-mode compressed state microwave field E ₂ and injects it into the 180° mixing ring;

Step 3, E ₂ and E ₁ have constructive interference at the output port C of the 180° hybrid ring, and destructive interference at port D, and the output signal of the C port is divided into two paths through the Wilkinson power divider, one of which is E ₅ The output signal of the D port is used as the output of the path entangled microwave source, and the other path E′ ₅ contains the relative phase information θ;

Step 4, E′ ₁ and E′ ₅ are respectively amplified by the amplifier group, and passed through a band-pass filter to filter out high-frequency signals and out-of-band noise;

Step 5, phase-shifting the E′ ₁ after amplification and filtering And carry out frequency mixing with E ' ₅ , output signal S _m1 filters out the signal that frequency is higher than Ω through low-pass filter, obtains signal S'_m1;

Step 6. The modulated signal generated by the modulated signal source Carry out frequency mixing with the signal _S'm1 , and filter out the signal with a frequency higher than Ω through a low-pass filter to obtain _Sm2 , which is a frequency discrimination signal for phase locking of the single-mode compressed microwave field;

Step 7. Control the phase shifter 2, so that the pump source 2 scans the phase of the pump signal at a specific frequency, and adjust the phase shifter 1 so that the intensity of the signal S _m2 frequency discrimination curve is the largest. At this time The frequency discrimination signal is simplified as

Step 8, stop the phase scanning of the signal generated by the pumping source 2, connect the PID control circuit and the phase shifter 2, and use S _m2 after low-pass filtering as the error signal of the PID control circuit;

Step 9, the error signal S _m2 of the relative phase is output to the phase shifter 2 through the voltage control signal S _c generated by the PID control circuit, and the pumping phase is adjusted;

Step 10, continue to step 9, so that the relative phase of the single-mode squeezed state is always kept at

Further, ω ₀ =5.788GHz, the pump source 2 scans the phase of the pump signal at a frequency of 20Hz, and Ω=30MHz.

The invention simplifies the system complexity of the path-entangled signal source, improves the benefit of path-entangled microwave preparation, and improves the application ability of the path-entangled microwave signal.

Description of drawings

Fig. 1 is the internal circuit structure diagram of the Josephson parametric amplifier;

Fig. 2 is a working principle diagram of the Josephson parametric amplifier;

Figure 3 is a schematic diagram of the working principle of the 180° hybrid ring;

Figure 4 is a schematic diagram of Josephson parametric amplifier and 180° hybrid ring preparation path entangled microwave;

Fig. 5 is a composition structure diagram of a single-mode compressed state microwave field phase locking device in the present invention;

FIG. 6 is a flow chart of the PID control circuit locking method in the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The Josephson parametric amplifier (JPA) used in the present invention is a phase-sensitive amplifier (Phase-SensitiveAmplifier), which can be driven by magnetic flux to work in the parameter amplification mode. Its specific structure is as shown in Figure 1. It consists of a superconducting quantum interference device (SQUID), a transmission line resonator, and a DC magnetic flux bias. Its working principle is shown in Figure 2. The pump source generates a signal with a frequency of _2ω0 and injects it into the Josephson parametric amplifier, so that a periodically changing magnetic flux is generated in the DC superconducting quantum interferometer ring, which in turn causes the transmission line resonator to resonate. When a microwave signal with a frequency of ω ₀ -ω is input to the signal terminal of the Josephson parametric amplifier, an idler signal with a frequency of ω ₀ +ω will be generated at the same time, where A represents the strength of the input signal, and G and M represent ω ₀ -ω and ω ₀ +ω The gain of the two signals, GA and MA represent the signal strength. When the Josephson parametric amplifier works in the degenerate parametric down-conversion mode, ω=0, and the output signal is a single-mode compressed microwave field.

The process of producing single-mode squeezed microwave field by Josephson parametric amplifier can be expressed by Hamiltonian:

Where i is an imaginary number representation in mathematics, is the normalized Planck constant, a represents the input signal light field with the input frequency ω; θ _re represents the relative phase difference between the pump light and the signal light; χ ⁽²⁾ is related to the second-order nonlinear polarizability , is a real number. make Then the time evolution operator is:

Let ξ=2tη, then the compression operator is:

Let r=2tχ ⁽²⁾ be expressed as the compression amplitude, and θ _re is expressed as the compression angle. It can be seen that the control input signal remains unchanged, and the compression angle of the output signal can be adjusted by changing the phase of the JPA pump signal, which satisfies the relationship Δθ _re ∝Δθ _pump , where θ _pump represents the phase of the pump, and Δ represents the deviation value, that is, θ This variable of _re is proportional to this variable of θ _pump .

The working principle of the 180° hybrid ring used in the present invention is shown in FIG. 3 . The 180° hybrid ring consists of a loop and four signal ports, where the input ports are A, B, and the output ports are C, D. Two channels of microwave signals with the same frequency are respectively input through A and B ports to produce interference effect in the ring. Among them, the signal input at port A produces a 180° phase difference at port C and D, while the signal input at port B produces the same phase output at port C and D, that is, the input signal is constructive interference and destructive interference at port C and D respectively. , this structure can be used to generate frequency-degenerate path-entangled microwaves.

The usual path entangled microwave generating device consists of a pump source, a microwave source, a Josephson parametric amplifier, a ring isolator, and a 180° hybrid ring. As shown in Figure 4, the pump source 1 outputs a pump signal 1 to the Josephson parametric amplifier 1 pumping end, the input signal 1 output by the microwave source 1 is input to the Josephson parametric amplifier 1 signal terminal through the annular isolator 1, and the signal end of the Josephson parametric amplifier 1 is output to the 180° hybrid ring B port through the annular isolator 1; the pump The pump source 2 outputs the pump signal 2 to the pump end of the Josephson parametric amplifier 2, the input signal 2 output by the microwave source 2 enters the signal terminal of the Josephson parametric amplifier 2 through the ring isolator 2, and the signal terminal of the Josephson parametric amplifier 2 passes through the ring The output of isolator 2 is to port A of the 180° hybrid ring; the output signals of port C and D of the 180° hybrid ring have path entanglement characteristics. The resonant frequency of the two Josephson parametric amplifiers is the same, both are ω ₀ , the two pump sources generate a signal with a frequency of ω _p = 2ω ₀ to act on the corresponding Josephson parametric amplifier, and the two microwave sources generate a signal with a frequency of ω ₀ The signal injection corresponds to the parametric down-conversion of the Josephson parametric amplifier, and the output is a single-mode compressed microwave field. The relative phase of the two single-mode compressed microwave fields is controlled to be π/2, and injected into the A and B ports of the 180° hybrid ring to generate interference. , the outputs of C and D ports are frequency-degenerate path-entangled microwave signals.

On the basis of the Josephson parametric amplifier and the 180° hybrid ring preparation path entanglement microwave, the present invention proposes a single-mode compressed state microwave field phase locking device, its composition is shown in Figure 5, and the pump source 1 is output to the Josephson The pump end of the parametric amplifier 1; the microwave source 1 is output to the signal terminal of the Josephson parametric amplifier 1 through the ring isolator 1; the signal terminal of the Josephson parameter amplifier 1 is output to the Wilkinson power divider 1 through the ring isolator 1; Wilkinson Power divider 1 outputs E ₁ to the 180° hybrid ring B port, and outputs E ₁ ′ to amplifier 2; amplifier 2 outputs to band-pass filter 2, and band-pass filter 2 outputs to Phase shifter, The output of the phase shifter is to the mixer 1; the output of the pumping source 2 is to the input end of the phase shifter 2, and the output of the phase shifter 2 is to the pumping end of the Josephson parametric amplifier 2; the output of the microwave source 2 is to the input end of the microwave phase modulator; One output of the modulation signal source is to the phase modulation terminal of the microwave phase modulator, and the other output is to the phase shifter 1; the microwave phase modulator outputs to the signal terminal of the Josephson parametric amplifier 2 through the ring isolator 2, and the signal terminal of the Josephson parametric amplifier 2 passes through the ring Isolator output E ₂ to 180° hybrid ring A port; 180° hybrid ring C port output E ₃ to Wilkinson power splitter 2, 180° hybrid ring D port output E ₄ to the outside of the device as a path for path entangled microwaves 1; Wilkinson power divider 2 outputs E ₅ ′ to the amplifier 1, and outputs E ₅ to the outside of the device, as the path 2 of the path entangled microwave; amplifier 1 outputs to the band-pass filter 1, and the band-pass filter 1 outputs to mixer 1; mixer 1 outputs S _m1 to low-pass filter 1, low-pass filter 1 outputs S' _m1 to mixer 2, and mixer 2 outputs S _m2 to PID through low-pass filter 2 The control circuit, the PID control circuit outputs S _c to the control terminal of the phase shifter 2 .

The modulation signal source produces a phase modulation signal of Ω and outputs it to the microwave phase modulator, and performs phase modulation on the input signal of the Josephson parametric amplifier 2. The amplitude of the single-mode compressed microwave field output by the Josephson parametric amplifier 2 can be expressed as:

E ₂ ＝A ₂ cos(ω ₀ t+msinΩt) (4)

When the second and higher harmonics generated by phase modulation are not considered, the first-order Bessel function is used to expand:

E ₂ ≈A ₂ [J ₀ (m)cosω ₀ t+J ₁ (m)cos(ω ₀ +Ω)tJ ₁ (m)cos(ω ₀ -Ω)t] (5)

Josephson parametric amplifier 1 generates a single-mode compressed microwave field which is divided into two signals E ₁ and E ₁ ′ by Wilkinson power divider 1, and its amplitude can be expressed as:

E ₁ ＝E ₁ ′＝A ₁ cosω ₀ t (6)

Among them, E ₁ interferes with the single-mode compressed microwave field E ₂ produced by Josephson parametric amplifier 2 in the 180° hybrid ring, the output path entangles signals E ₃ and E ₄ , and the Wilkinson power divider divides the signal power without destroy its entanglement properties. Assuming that the relative phase of the two single _- mode compressed microwave fields is θ, E3 can be expressed as:

Use the Wilkinson power divider to divide the power of E ₃ into two paths, E ₅ and E ₅ ′. At this time, E ₄ and E ₅ are used as the output of the path-entangled microwave signal source, while E ₅ ′ and E ₁ ′ are amplified and filtered Process the phase modulated signal demodulated by the mixer:

After the low-pass filter, the AC signal whose frequency is not greater than Ω is processed, so S _m1 can be simplified as:

This signal contains the relative phase between the two single-mode squeezed microwave fields.

Phase modulation signal generated by modulation signal source After the phase shifter 1 and S' _m1 are sent to the mixer at the same time, where the phase shifter adjusts the relative phase of the modulation signal source and S' _m1 as The mixed frequency signal is obtained by filtering out the signal with a frequency greater than Ω through a low-pass filter

The output is a frequency discrimination signal that locks the relative phase of two single-mode compressed state microwave fields, and the relative phase is locked as when adjusting When , the intensity of the S _m2 frequency discrimination curve is the largest.

The present invention also proposes a single-mode compressed state microwave field phase locking method, including:

Step 1. Pumping source 1 and pumping source 2 generate signals of ω _p = 2ω ₀ respectively to drive Josephson parametric amplifier 1 and Josephson parametric amplifier 2 to resonate at ω ₀ , and signal source 1 generates a signal of ω ₀ to inject into Josephson Parametric amplifier 1 signal port, while the phase modulation signal generated by the modulation signal source is injected into the microwave phase modulator, and the signal of ω ₀ generated by the signal source 2 is injected into the JPA2 signal port after phase modulation;

Step 2. JPA1 outputs a single-mode compressed state microwave field and divides the signal into two paths through a Wilkinson power splitter. One path E ₁ is injected into the 180° hybrid ring, and the other path E ₁ ′ is used as a reference signal for phase locking. At the same time, JPA2 generates a single-mode compressed microwave field E ₂ and injects it into the 180° mixing ring;

Step 3, E ₂ and E ₁ have constructive interference at the output port C of the 180° hybrid ring, and destructive interference at port D, and the output signal of the C port is divided into two paths through the Wilkinson power divider, one of which is E ₅ The output signal of the D port is used as the output of the path entangled microwave source, and the other path E′ ₅ contains the relative phase information θ;

Step 4, E′ ₁ and E′ ₅ are respectively amplified by the amplifier group, and passed through a band-pass filter to filter out high-frequency signals and out-of-band noise;

Step 5, phase-shifting the E′ ₁ after amplification and filtering And carry out frequency mixing with E′ ₅ , the output signal S _m1 filters out the signal that the frequency is higher than Ω through the low-pass filter;

Step 6. The modulated signal generated by the modulated signal source Perform frequency mixing with the signal S _m1 to obtain S _m2 , which is a frequency discrimination signal for phase locking of the single-mode compressed microwave field;

Step 7. Control the phase shifter 2, so that the pump source 2 scans the phase of the pump signal at a specific frequency, and adjust the phase shifter 1 so that the intensity of the signal S _m2 frequency discrimination curve is the largest. At this time The frequency discrimination signal is simplified as

Step 8, stop the phase scanning of the signal generated by the pumping source 2, connect the PID control circuit and the phase shifter 2, and use S _m2 after low-pass filtering as the error signal of the PID control circuit;

Step 9, the error signal S _m2 of the relative phase is output to the phase shifter 2 through the voltage control signal S _c generated by the PID control circuit, and the pumping phase is adjusted;

Step 10, continue to step 9, so that the relative phase of the single-mode squeezed state is always kept at

The PID control circuit can lock the error signal near zero, that is, the relative phase of the single-mode compressed state microwave field is locked at Its workflow is shown in Figure 6. Due to power instability and noise interference, the maximum value of the frequency discrimination signal fluctuates, so it is difficult to lock the maximum value point by using the PID control circuit, so step ₅ shifts the phase of E'1 processed so that the relative phase is The time-frequency discrimination signal is zero, which avoids the influence of the instability of the amplitude of the frequency discrimination signal on the true value of the relative phase error signal.

In a specific embodiment of the present invention, the resonance frequency of the Josephson parametric amplifier is ω ₀ =5.788GHz; the pump source generates a signal of ω _p =2ω ₀ ; the modulation signal source generates a 30MHz phase modulation signal and injects it into the microwave phase modulator ; The pump source 2 scans the phase of the pump signal at a frequency of 20Hz; the modulation signal source generates a phase modulation signal of Ω=30MHz; the microwave source adopts the SLFS12A microwave analog signal generator (1MHz -12GHz) to generate a signal with frequency ω ₀ ; the 180° hybrid ring adopts CPL-5850-100-SMA produced by MITEQ Estonia; the amplifier adopts LNF-LNC4-8C produced by Low Noise Factory; the ring isolator adopts Low Noise Factory produced LNF-ISC4-8A; Phase shifter 1 is MPS-DC1G-360-S produced by Commphy Microwave; Phase shifter 2 is CVPS-4G8G-360 produced by Commphy Microwave; Mixer 1 is produced by Marki Microwave MT3-0113LCOG; mixer 2 adopts T3-12 produced by Marki Microwave; Wilkinson power divider adopts PD-0109 produced by Marki Microwave; bandpass filter adopts TBF produced by Suzhou Tailai Microwave Technology Co., Ltd. -5780-100-C7, the center frequency is 5.788GHz, and the bandwidth is 100MHz; the low-pass filter is planned to be customized by Suzhou Taylor Microwave Technology Co., Ltd., and its cutoff frequency is 50MHz.

The phase locking method of compressed microwave field proposed by the present invention effectively integrates the non-classical characteristics of quantum technology and the stability and reliability of classical systems, not only retains the characteristics of compression and entanglement in the realization process, but also reduces the difficult-to-implement Quantum tomography and state reconstruction technology are transformed into the detection of classical signals, which greatly simplifies the system complexity under the premise of ensuring entanglement performance, and is conducive to the industrial preparation of path entangled microwaves.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A path-entangled microwave phase locking device, comprising a pump source, a Josephson parametric amplifier, a microwave source, a ring isolator, a Wilkinson power divider, a 180° hybrid ring, an amplifier, a filter, a phase shifter, a hybrid Frequency converter, PID control circuit, microwave phase modulator and modulation signal source, characterized in that: pump source 1 is output to the pump end of Josephson parametric amplifier 1; microwave source 1 is output to Josephson parametric amplifier 1 through ring isolator 1 Signal terminal; Josephson parametric amplifier 1 signal terminal is output to Wilkinson power divider 1 through ring isolator 1; Wilkinson power divider 1 has one output E ₁ to 180° hybrid ring B port, one output E ₁ ′ to Amplifier 2; amplifier 2 output to filter 2, filter 2 output to phase shifter 3, phase shifter 3 output to mixer 1; pump source 2 output to phase shifter 2 input, phase shifter 2 output To the pump end of Josephson parametric amplifier 2; the output of microwave source 2 to the input end of the microwave phase modulator; one output of the modulation signal source to the phase modulation end of the microwave phase modulator, and one output to the phase shifter 1; the microwave phase modulator passes through the loop Isolator 2 outputs to Josephson parametric amplifier 2 signal terminal, and Josephson parametric amplifier 2 signal terminal outputs E ₂ to 180° hybrid ring A port through the ring isolator; 180° hybrid ring C port outputs E ₃ to Wilkinson power divider 180° hybrid ring D port output E ₄ to the outside of the device; Wilkinson power divider 2 has one output E ₅ ′ to amplifier 1, and one output E ₅ to the outside of the device; amplifier 1 output to filter 1, filter 1 is output to mixer 1; mixer 1 outputs S _m1 to filter 3, filter 3 outputs S' _m1 to mixer 2, and mixer 2 outputs S _m2 to PID control circuit through filter 4, PID The control circuit outputs S _c to the control terminal of the phase shifter 2 . 2. A kind of path entanglement microwave phase locking device as claimed in claim 1, is characterized in that: phase shifter 3 is Phase shifter, filter 1 and filter 2 are band-pass filters, filter 3 and filter 4 are low-pass filters. 3. A kind of path entanglement microwave phase locking device as claimed in claim 2, it is characterized in that: the resonance frequency of Josephson parametric amplifier is ω ₀ =5.788GHz; The pump source produces the signal of ω _p =2ω ₀ ; Modulation signal The source generates a phase modulation signal of 30MHz; the modulation signal source generates a phase modulation signal of Ω=30MHz; the microwave source adopts SLFS12A microwave analog signal generator; the 180° mixing ring adopts CPL-5850-100-SMA; the amplifier adopts LNF-LNC4-8C ;The ring isolator adopts LNF-ISC4-8A; the phase shifter 1 adopts MPS-DC1G-360-S; the phase shifter 2 adopts CVPS-4G8G-360; the mixer 1 adopts MT3-0113LCOG; the mixer 2 adopts T3 -12; Wilkinson power divider adopts PD-0109; band-pass filter adopts TBF-5780-100-C7, center frequency is 5.788GHz, bandwidth is 100MHz; low-pass filter is customized, cut-off frequency is 50MHz. 4. A method for path entanglement microwave phase locking, using the device as claimed in claim 2, comprising: Step 1. Pumping source 1 and pumping source 2 generate signals of ω _p = 2ω ₀ respectively to drive Josephson parametric amplifier 1 and Josephson parametric amplifier 2 to resonate at ω ₀ , and signal source 1 generates a signal of ω ₀ to inject into Josephson Parametric amplifier 1 signal port, while the phase modulation signal generated by the modulation signal source is injected into the microwave phase modulator, and the signal of ω ₀ generated by signal source 2 is injected into the Josephson parametric amplifier 2 signal port after phase modulation; Step 2, Josephson parametric amplifier 1 outputs a single-mode compressed microwave field and divides the signal into two paths through a Wilkinson power divider, wherein one path E ₁ is injected into the 180° hybrid ring, and the other path E′ ₁ is used as a reference for phase locking signal; at the same time, Josephson parametric amplifier 2 generates a single-mode compressed state microwave field E ₂ and injects it into the 180° mixing ring; Step 3, the C port output signal is divided into two paths by the Wilkinson power divider, wherein one path _E'5 and the D port output signal are used as the output of the path entangled microwave source, and the other path _E'5 contains the relative phase information θ; Step 4, E′ ₁ and E′ ₅ are respectively amplified by the amplifier group, and passed through a band-pass filter to filter out high-frequency signals and out-of-band noise; Step 5, phase-shifting the E′ ₁ after amplification and filtering And carry out frequency mixing with E ₅ ', the output signal S _m1 filters out the signal of frequency higher than Ω through the low-pass filter, obtains the signal S'_m1; Step 6. The modulated signal generated by the modulated signal source Carry out frequency mixing with the signal _S'm1 , and filter out the signal with a frequency higher than Ω through a low-pass filter to obtain _Sm2 , which is a frequency discrimination signal for phase locking of the single-mode compressed microwave field; Step 7. Control the phase shifter 2, so that the pump source 2 scans the phase of the pump signal at a specific frequency, and adjust the phase shifter 1 so that the strength of the signal S _m2 frequency discrimination curve is the largest; Step 8, stop the phase scanning of the signal generated by the pumping source 2, connect the PID control circuit and the phase shifter 2, and use S _m2 after low-pass filtering as the error signal of the PID control circuit; Step 9, the error signal S _m2 of the relative phase is output to the phase shifter 2 through the voltage control signal S _c generated by the PID control circuit, and the pumping phase is adjusted; Step 10, continue to step 9, so that the relative phase of the single-mode squeezed state is always kept at 5. A path-entangled microwave phase locking method according to claim 4, characterized in that: ω ₀ =5.788 GHz, the pump source 2 scans the phase of the pump signal at a frequency of 20 Hz, and Ω = 30 MHz.