Apparatus and method for weak signal detection based on stochastic resonance and phonon laser

Abstract

The application discloses a device for weak signal detection based on random resonance and phonon laser, a metal angle valve and an ion pump are connected with a vacuum cavity through a four-way vacuum pipeline, CF35 ultrahigh vacuum interfaces are installed at eight top corners of the vacuum cavity, one of the CF35 ultrahigh vacuum interfaces is connected with the four-way vacuum pipeline, CF100 quartz observation windows are arranged on four circumferential sides of the vacuum cavity respectively, a CF100 electrode lead flange is further arranged on the vacuum cavity, and a chip ion trap and an atomic furnace fixed in the vacuum cavity are arranged on the CF100 electrode lead flange, and the application further discloses a method for weak signal detection based on random resonance and phonon laser, the application selects a background noise amplitude with the optimal output signal-to-noise ratio, so that the to-be-detected weak signal, the background noise and a phonon laser bistable system are optimally matched, the to-be-detected weak signal mixed with a noise spectrum is effectively identified, and the signal-to-noise ratio is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of signal detection, in particular to a device for weak signal detection based on random resonance and phonon laser, and a method for weak signal detection based on random resonance and phonon laser. BACKGROUND

[0002] Weak signal detection is a technology for studying how to extract useful signals from strong noise environment, which not only involves information theory, nonlinear science, signal processing and other disciplines, but also is closely related to the application fields of national economy and people's daily life. Weak signal does not only mean a signal with small amplitude, but mainly refers to a signal whose intensity is less than that of background noise. For example, due to the influence of factors such as motor vibration, stray magnetic field interference, temperature and pressure changes, the precision sensor devices such as electric field meter, flux gate, accelerometer and gyroscope will produce huge drift error, resulting in that the original measurement signal is severely disturbed by noise, causing the useful signal to be weak in amplitude and extremely low in signal-to-noise ratio; in many engineering and technical practical applications, signal and noise coexist, and the main task to extract weak signal from strong noise background is to improve the signal-to-noise ratio of the detected signal.

[0003] Traditional weak signal detection methods mainly include matched filtering method, adaptive filtering method, wavelet transform method and Kalman filtering method, etc. These methods are mostly based on noise suppression mechanism, and in the process of filtering out noise, the useful signal is inevitably suppressed or damaged to a certain extent, or even leads to the difficulty in identifying some useful signals whose frequency spectrum is mixed with noise signal.

[0004] In recent years, the weak signal detection method based on random resonance has been concerned by a large number of research institutions at home and abroad due to its enhancement characteristics for weak signals. Random resonance takes bistable system as a model to study the nonlinear correlation between system output and input signal, interference noise and bistable system parameters. When the input signal, interference noise and nonlinear system parameters reach a certain matching relationship, part of the noise energy can be converted into signal energy by using random resonance to detect weak signal, so that the signal-to-noise ratio of the output signal is improved compared with the initial input, thereby effectively improving the spectrum sensing performance and solving the problems of difficult detection and low detection probability of weak signal. Therefore, random resonance is widely used in various signal processing fields such as energy detection, variance matrix detection, cyclic stationary feature detection and cooperative detection.

[0005] Bistable nonlinear systems are among the most common types of stochastic resonance systems. This technical solution selects a phonon laser system based on trapped ions. This refers to the coherent oscillation of trapped ions under the combined action of a red-detuned laser and a blue-detuned laser in the same direction. The red-detuned laser cools the ions, while the blue-detuned laser amplifies the ion amplitude. The phenomenon of ions continuously emitting phonons during oscillation is similar to the photon radiation of an optical laser, hence the name phonon laser. Compared to an optical laser, the blue-detuned laser here acts as the pump source, the ions as the gain medium, and the trapped field and the red-detuned laser together function as the resonant cavity. A phonon laser can only be formed when the detuning amount of the red and blue detuned lasers and the ratio of their intensity saturation parameters meet specific conditions. Its amplitude is only related to the detuning amount of the red and blue detuned lasers and the ratio of their intensity saturation parameters. The phonon excited state and the non-phonon excited state of the phonon laser together form the bistable state required for stochastic resonance. Compared to other bistable systems such as mechanical thin-film oscillators, the phonon laser has the significant advantage of an adjustable bistable range.

[0006] Currently, there are two methods to achieve stochastic resonance: the first is to generate stochastic resonance by increasing the noise intensity; the second is to generate stochastic resonance by adjusting the system's own parameters to improve the matching relationship between the signal, noise, and the system's nonlinear parameters. However, when the noise intensity exceeds the matching range between the system and the signal, further increasing the noise intensity will only overwhelm the signal and prevent stochastic resonance from being generated. Summary of the Invention

[0007] The purpose of this invention is to address the difficulties in detecting weak signals in existing technologies due to the complexity and diversity of background noise and low signal-to-noise ratio. This invention provides a device for weak signal detection based on random resonance and phonon laser, and also provides a method for weak signal detection based on random resonance and phonon laser. By utilizing a phonon laser bistable system and selecting the background noise amplitude with the optimal output signal-to-noise ratio, the invention achieves optimal matching between the weak signal to be measured, the background noise, and the phonon laser bistable system. This effectively identifies the weak signal to be measured that is aliased with the noise spectrum and significantly improves its signal-to-noise ratio, thus providing a solution for detecting weak signals in complex environmental noise.

[0008] The above-mentioned objectives of the present invention are achieved through the following technical means:

[0009] The device for weak signal detection based on stochastic resonance and phonon laser comprises a metal angle valve and an ion pump, the metal angle valve and the ion pump are connected with a vacuum cavity through a four-way vacuum pipeline, a CF35 ultrahigh vacuum interface is arranged at each of eight top corners of the vacuum cavity, one of the CF35 ultrahigh vacuum interfaces is connected with the four-way vacuum pipeline, a first CF100 quartz observation window, a second CF100 quartz observation window, a third CF100 quartz observation window and a fourth CF100 quartz observation window are arranged on four circumferential sides of the vacuum cavity respectively, a CF100 electrode lead flange connected with an external radio frequency voltage source is further arranged on the vacuum cavity, and a chip ion trap and an atomic furnace fixed in the vacuum cavity are arranged on the CF100 electrode lead flange.

[0010] The device for weak signal detection based on stochastic resonance and phonon laser further comprises a 397nm laser, 397nm laser emitted by the 397nm laser is incident on an isolator, red detuned laser is output through a red acousto-optic modulator after light emitted by the isolator is transmitted through a polarization beam splitter, blue detuned laser is output through a blue acousto-optic modulator after light emitted by the isolator is reflected through the polarization beam splitter, the frequency of the blue detuned laser output through the blue acousto-optic modulator is adjusted through an arbitrary waveform generator, and the background noise in the blue detuned laser is adjusted through the arbitrary waveform generator AWG.

[0011] The device for weak signal detection based on stochastic resonance and phonon laser further comprises photoionization laser and cooling laser, the photoionization laser, the red detuned laser, the cooling laser and the blue detuned laser are input into the vacuum cavity from the second CF100 quartz observation window.

[0012] In the vacuum cavity, calcium atoms sprayed out by the atomic furnace are photoionized by the photoionization laser input from the second CF100 quartz observation window to generate 40 Ca + ions in a photoionization manner, the generated three-dimensional trapped potential well is loaded on the electrode surface of the chip ion trap, the red detuned laser and the 866nm cooling laser input from the second CF100 quartz observation window are used for Doppler cooling of the 40 Ca + ions, and the blue detuned laser input from the second CF100 quartz observation window is used for generating phonon laser on the trapped 40 Ca + ions together with the red detuned laser.

[0013] The method for weak signal detection based on stochastic resonance and phonon laser comprises the following steps:

[0014] Step 1, generating phonon laser in a vacuum cavity;

[0015] Step 2, the fluorescence signal is collected by using an imaging acquisition system, and after FFT data processing, the background noise amplitude, the background noise bandwidth, the frequency of the to-be-detected weak signal, and the amplitude of the to-be-detected weak signal are obtained, and further, the output signal-to-noise ratio SNR is obtained out ;

[0016] Step 3, the background noise amplitude introduced by the arbitrary waveform generator is changed, and step 2 is implemented, and the peak value of the output signal-to-noise ratio SNR out Corresponding to the background noise amplitude is selected as the best matching noise amplitude;

[0017] Step 4, the arbitrary waveform generator superimposes the best matching noise amplitude and the to-be-detected weak signal and loads it on the blue light acousto-optic modulator, step 2 is implemented, and the frequency of the final to-be-detected weak signal and the amplitude of the to-be-detected weak signal are obtained.

[0018] As described above, step 1 includes the following steps:

[0019] The vacuum cavity is maintained at 10 -9 Pa by using a metal angle valve and an ion pump, calcium atoms sprayed by an atomic furnace are photoionized by photoionization laser light introduced from the second CF100 quartz observation window to generate 40 Ca + Ions, and are loaded into a three-dimensional trapping potential well generated on the electrode surface of the chip ion trap, red detuned laser and 866nm cooling laser are introduced from the second CF100 quartz observation window to perform Doppler cooling on the 40 Ca + Ions; the blue detuned laser is used together with the red detuned laser to act on the trapped 40 Ca + Ions to generate phonon laser.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The present application selects the background noise amplitude that maximizes the output signal-to-noise ratio, so that the to-be-detected weak signal, the background noise and the phonon laser bistable system are optimally matched, the to-be-detected weak signal mixed with the noise spectrum is effectively identified, and the signal-to-noise ratio is greatly improved, thereby providing a solution for detecting the to-be-detected weak signal in a complex environmental noise.

[0022] The detection of the specific embodiment shows that from Figure 7 And Figure 10 The spectrum graph can find that the signal-to-noise ratio of the to-be-detected weak signal is significantly enhanced, proving the effectiveness and reliability of the matching random resonance method for weak signal detection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1This is a schematic flowchart of the detection method of the device of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the device of the present invention;

[0025] Figure 3 This is a schematic diagram of the optical path of a 397nm laser.

[0026] Figure 4 A measurement diagram of the bistable region width generated by a phonon laser;

[0027] Figure 5 The graph shows the variation of the bistable region width with the ratio r of the saturation parameter r of the blue and red detuned laser light intensities.

[0028] Figure 6 This is a time-domain waveform diagram of the weak signal to be measured provided in Embodiment 2 of the present invention;

[0029] Figure 7 The spectrum diagram of the weak signal to be tested provided in Embodiment 2 of the present invention;

[0030] Figure 8 This is a graph showing the variation of the output signal-to-noise ratio with the input noise amplitude under different bistable region widths, as provided in Embodiment 2 of the present invention.

[0031] Figure 9 To use the second embodiment of the present invention Figure 6 The time-domain waveform obtained by detecting the weak signal to be measured;

[0032] Figure 10 To use the second embodiment of the present invention Figure 6 The spectrum obtained by detecting the weak signal to be tested. Detailed Implementation

[0033] To facilitate understanding and implementation of the present invention by those skilled in the art, the present invention will be further described in detail below with reference to examples. The implementation examples described herein are only for illustration and explanation and are not intended to limit the present invention.

[0034] Example 1:

[0035] The device for detecting weak signals based on random resonance and phonon laser includes a metal angle valve 1, an ion pump 2, and a vacuum chamber 6. The metal angle valve 1 and the ion pump 2 are connected to the vacuum chamber 6 via a four-way vacuum pipe 3. The system vacuum level can be maintained at 10°C through the metal angle valve 1 and the ion pump 2. -9The vacuum chamber 6 has 8 CF35 ultra-high vacuum interfaces 5, 4 CF100 quartz observation windows (4, 8, 9, 10), and 1 CF100 electrode lead flange 7. The vacuum chamber 6 is cubic, with CF35 ultra-high vacuum interfaces 5 installed at each of its eight apex corners. One of these interfaces connects to a four-way vacuum pipe 3. Four CF100 quartz observation windows (4, 8, 9, 10) are located on the four circumferential sides of the vacuum chamber 6: the first CF100 quartz observation window 4, the second CF100 quartz observation window 8, the third CF100 quartz observation window 9, and the fourth CF100 quartz observation window 10. One of the remaining two sides of the vacuum chamber 6 is equipped with a CF100 electrode lead flange 7 for connection to an external radio frequency voltage source, used to secure the chip ion trap and atomic furnace within the vacuum chamber 6. The second CF100 quartz observation window 8 is used to input photoionization lasers, red detuned lasers, cooling lasers, and blue detuned lasers. An imaging acquisition system (including an imaging mirror, photomultiplier tube, and photon counter) is located outside the third CF100 quartz observation window 9 to collect the fluorescence from the spontaneous emission of ions (mainly from...). 40 Ca + Ion electronic level P 1 / 2 →S 1 / 2 (spontaneous fluorescence).

[0036] Trapping in an ion trap 40 Ca + Under the drive of an external driving electric field, ions generate simple harmonic vibrations with a frequency of ω along the z-direction:

[0037] z(t) = z0sin(ωt)

[0038] v(t)=v0coS(ωt)

[0039] Where z(t) and v(t) are the displacement and velocity of the ion from its equilibrium position at time t, and z0 and v0 = ωz0 are the maximum values ​​of the ion amplitude and velocity, respectively.

[0040] Due to the Doppler effect, ions are affected by the effective detuning amount Δ of red and blue detuned lasers. eff，i (t) can be written as:

[0041] Δ eff，i (t)=Δ i -k i v(t)=Δ i -k i v0cos(ωt),

[0042] The photon scattering rate is:

[0043]

[0044] where i = r, b, r, and b correspond to the red-detuned laser and the blue-detuned laser, respectively, Γ = 2π x 20.68 MHz is the 40 Ca + natural linewidth of the ion, Δ i , k i , s i represent the detuning, wave vector, and saturation parameter of the laser (red-detuned laser and blue-detuned laser), respectively. Since the ion gains a momentum a scattering force F i (t) on the ion:

[0045]

[0046] Therefore, the average power <P a，i > that the ion receives from the detuned lasers (red-detuned laser and blue-detuned laser) in one vibration period is:

[0047] <P a . i > = <F i (t)v(t)>.

[0048] where < > denotes the average operator; is the reduced Planck constant,

[0049] Meanwhile, the ion also receives heating from spontaneous emission. The average power <P s，i > that the ion receives from spontaneous emission in one vibration period is:

[0050]

[0051] where is a geometric factor, representing the proportion of spontaneous emission relative to absorption, is the reduced Planck constant, m = 40 x 1.67 x 10 -27 kg is the mass of the ion. The total average power <P tot > that the ion receives from the lasers in one vibration period is:

[0052] <P tot > = <P a，r > + <P a，b > + <P s，r > + <P s，b >.

[0053] When the ion is in a steady state, the total average power <P tot (z0)) = 0.

[0054] A mixed signal containing weak signals and noise acts on the blue detuning quantity in the above formula in the form of frequency modulation. The weak signal can be various types of signals such as digital pulse signals and random signals; the noise is environmental noise or man-made noise, which can be Gaussian noise, white noise, or colored noise, etc. When the parameters of the phonon laser bistable system are well matched with the weak signal and noise, the energy of the noise can be transferred to the signal, thereby amplifying the signal-to-noise ratio of the output signal.

[0055] like Figure 3 As shown in the simplified diagram of the 397nm laser optical path, the output light of the 397nm laser is incident on the isolator. After being transmitted through the polarization beam splitter PBS, the light from the isolator is output as a red detuned laser by the red acousto-optic modulator AOM1. The light from the isolator is reflected by the polarization beam splitter PBS and then incident on the blue acousto-optic modulator AOM2. After the weak signal to be measured is converted into an electrical signal, it is loaded onto the blue acousto-optic modulator AOM2 by frequency modulation through the arbitrary waveform generator AWG. The frequency of the output blue detuned laser is adjusted by the blue acousto-optic modulator AOM2, and the background noise in the blue detuned laser is adjusted by the arbitrary waveform generator AWG.

[0056] In this embodiment, noise loading can be achieved using an arbitrary waveform generator (AWG), and the noise amplitude with the optimal output signal-to-noise ratio in the fluorescence signal acquired by the imaging acquisition system can be selected as the best-matched noise amplitude.

[0057] Example 2:

[0058] The method for detecting weak signals based on random resonance and phonon lasers, utilizing the device for detecting weak signals based on random resonance and phonon lasers described in Example 1, includes the following steps:

[0059] Step 1: Generate phonon laser and set the parameters of the phonon laser bistable system;

[0060] like Figure 3 As shown in the simplified diagram of the 397nm laser optical path, the output light of the 397nm laser is incident on the isolator. After being transmitted through the polarization beam splitter PBS, the light from the isolator is output as a red detuned laser by the red acousto-optic modulator AOM1. The light from the isolator is reflected by the polarization beam splitter PBS and then incident on the blue acousto-optic modulator AOM2. After the weak signal to be measured is converted into an electrical signal, it is loaded onto the blue acousto-optic modulator AOM2 by frequency modulation through the arbitrary waveform generator AWG. The frequency of the output blue detuned laser is adjusted by the blue acousto-optic modulator AOM2, and the background noise in the blue detuned laser is adjusted by the arbitrary waveform generator AWG.

[0061] The vacuum chamber 6 is maintained at 10 using metal angle valve 1 and ion pump 2. -9In a super-high vacuum environment, the calcium atoms ejected from the atomic furnace are photoionized by the photoionization laser from the second CF100 quartz observation window 8 in the vacuum chamber 6 40 Ca + ions are generated and loaded into the three-dimensional trapping potential well generated by the electrode surface of the chip ion trap 40 Ca + ions are Doppler-cooled by the red-detuned laser and the 866nm cooling laser from the second CF100 quartz observation window 8 40 Ca + ions are generated by the phonon laser.

[0062] Figure 4 The schematic diagram of the phase transition of the phonon laser bistable system, the sweep down line is to scan the blue-detuned laser from low to high, the sweep up line is to scan the blue-detuned laser from high to low in the opposite direction, and the initial detuning of the red-detuned laser and the blue-detuned laser is Δ r / 2π=-80MHz and Δ b / 2π=66MHz. It can be seen that with the change of the detuning of the two lasers, the fluorescence count will have a mutation point in both directions, i.e. the phase transition point, and the difference between the two mutation points is the bistable region width.

[0063] The bistable region width and the ratio of the saturation parameters of the blue-detuned laser and the red-detuned laser r=s b / s r about, Figure 5 The bistable region width changes with r, the intensity of the red-detuned laser is fixed, and the adjustment of the bistable region width can be realized by changing the AOM2 amplitude of the blue-detuned laser. The narrower the bistable region width, the worse the stability of the bistable system, i.e. the easier the transition between the two states; the wider the bistable region width, i.e. the stronger the blue-detuned laser intensity and the larger the ion amplitude, the more unstable the trapping. Therefore, the bistable region width of the phonon laser is set in the middle of the adjustment range, corresponding to a bistable region width of 2π×3.0MHz and a saturation intensity parameter ratio of about 0.47.

[0064] Step 2: The sensor receives weak signals and environmental noise and preliminarily estimates relevant parameters;

[0065] When a phonon laser bistable system is subjected to a low-frequency periodic modulation, if the modulation amplitude is small, the phonon laser bistable system remains in a fixed state; however, if the modulation amplitude is large enough, it will induce continuous jumps in the state of the phonon laser bistable system. These changes can be monitored in real time using the changes in the fluorescence signal acquired by the imaging acquisition system. In this embodiment, the imaging acquisition system has a sampling rate of 20 Sa / s, a total sampling time of 50 s, and 1000 sampling points.

[0066] By processing the output signal data using FFT (Fast Fourier Transform, which converts a time-domain signal into a frequency-domain signal), we can initially obtain the background noise amplitude, background noise bandwidth, frequency of the weak signal under test, and amplitude of the weak signal under test. Then, by dividing the amplitude of the weak signal under test by its background noise amplitude and taking the logarithm, we can obtain the output signal-to-noise ratio (SNR). out .

[0067] The parameters selected for the example are: the frequency of the weak signal to be measured is 1Hz, and the amplitude is 150mV. Figure 6 and 7 As shown in the waveform and spectrum, the weak signal under test is completely submerged in the background noise, with a signal-to-noise ratio of 0 dB. Preliminary data processing yields the following background noise parameters: background noise bandwidth 100 Hz, background noise amplitude 2,000 mV.

[0068] Step 3: Select the optimal matching background noise amplitude corresponding to the weak signal to be measured;

[0069] By changing the amplitude of the background noise introduced by the arbitrary waveform generator (AWG), the signal-to-noise ratio of the resulting output signal exhibits a significant resonance phenomenon. Figure 8 The graph illustrating the variation of the amplitude of the additional white noise introduced in this embodiment of the invention and the signal-to-noise ratio (SNR) of the output signal shows that as the noise amplitude increases, the SNR of the output signal initially increases significantly, reaches a maximum value, and then stops increasing. The output signal gradually becomes submerged in the excessive noise. The output SNR is then selected as the optimal value. out The background noise amplitude corresponding to the peak value is used as the optimal matching noise amplitude to achieve the introduction of white noise amplitude.

[0070] Based on the above rules, the optimal noise amplitude for this embodiment is determined to be 0.70V.

[0071] Step 4: Weak signal detection and data processing output

[0072] Based on the optimal matching noise amplitude selected in step 3, the arbitrary waveform generator (AWG) superimposes the optimal matching noise amplitude and the weak signal to be measured onto the blue light acousto-optic modulator (AOM2), thereby realizing the detection of the input weak signal to be measured and the amplification of the optimal signal-to-noise ratio.

[0073] The time-domain waveform and the frequency spectrum of the output signal after FFT data processing of the output signal of the imaging acquisition system are shown in Figure 9 and 10 As can be seen from the right side of the frequency spectrum, the to-be-detected weak signal at 1 Hz marked by the dashed box is obviously shown, and the signal-to-noise ratio is improved from 0 dB of the input to about 24 dB.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A device for detecting weak signals based on random resonance and phonon laser, comprising a metal angle valve (1) and an ion pump (2), characterized in that, The metal angle valve (1) and the ion pump (2) are connected to the vacuum chamber (6) through the four-way vacuum pipe (3). CF35 ultra-high vacuum interfaces (5) are installed at the eight corners of the vacuum chamber (6). One of the CF35 ultra-high vacuum interfaces (5) is connected to the four-way vacuum pipe (3). The four sides of the vacuum chamber (6) are respectively provided with a first CF100 quartz observation window (4), a second CF100 quartz observation window (8), a third CF100 quartz observation window (9), and a fourth CF100 quartz observation window (10). The vacuum chamber (6) is also provided with a CF100 electrode lead flange (7) connected to an external radio frequency voltage source. The chip ion trap and atomic furnace located inside the vacuum chamber (6) are fixed on the CF100 electrode lead flange (7).

2. The device for weak signal detection based on random resonance and phonon laser according to claim 1, characterized in that, It also includes a 397nm laser. The 397nm laser emitted from the 397nm laser is incident on an isolator. The light emitted from the isolator is transmitted through a polarization beam splitter (PBS) and then outputs a red detuned laser through a red acousto-optic modulator (AOM1). The light emitted from the isolator is reflected by the polarization beam splitter (PBS) and then incident on a blue acousto-optic modulator (AOM2). The weak signal to be measured is converted into an electrical signal and then loaded onto the blue acousto-optic modulator (AOM2) through an arbitrary waveform generator (AWG). The frequency of the output blue detuned laser is adjusted by the blue acousto-optic modulator (AOM2), and the background noise in the blue detuned laser is adjusted by the arbitrary waveform generator (AWG).

3. The device for weak signal detection based on random resonance and phonon laser according to claim 2, characterized in that, It also includes photoionization laser and cooling laser. The photoionization laser, red detuned laser, cooling laser and blue detuned laser are input into the vacuum cavity (6) through the second CF100 quartz observation window (8).

4. The device for detecting weak signals based on random resonance and phonon laser according to claim 2, characterized in that, Inside the vacuum chamber (6), calcium atoms ejected from the atomic furnace are passed through a photoionization laser introduced from the second CF100 quartz observation window (8) to generate calcium atoms by photoionization. 40 Ca + Ions are loaded into a three-dimensional trapping potential well generated on the electrode surface of the chip ion trap, and a red detuned laser and an 866nm cooling laser are introduced through the second CF100 quartz observation window (8) to... 40 Ca + Ions are subjected to Doppler cooling; blue detuned laser and red detuned laser are applied together to the confinement through the second CF100 quartz observation window (8). 40 Ca + Phonon lasers are generated on ions.

5. A method for detecting weak signals based on random resonance and phonon laser, utilizing the device for detecting weak signals based on random resonance and phonon laser as described in claim 2, characterized in that, Includes the following steps: Step 1: Generate phonon laser in vacuum cavity (6); Step 2: Acquire fluorescence signals using the imaging acquisition system, perform FFT data processing to obtain background noise amplitude, background noise bandwidth, frequency of the weak signal to be measured, and amplitude of the weak signal to be measured, and further obtain the output signal-to-noise ratio (SNR). out ; Step 3: Change the background noise amplitude introduced by the arbitrary waveform generator (AWG) and implement Step 2, then select the output signal-to-noise ratio (SNR). out The background noise amplitude corresponding to the peak value is taken as the noise amplitude for the best match; Step 4: The Arbitrary Waveform Generator (AWG) superimposes the optimally matched noise amplitude and the weak signal to be measured onto the Blue Light Acousto-Optical Modulator (AOM2), and performs Step 2 to obtain the final frequency and amplitude of the weak signal to be measured.

6. The method for detecting weak signals based on stochastic resonance and phonon lasers according to claim 5, characterized in that, Step 1 includes the following steps: The vacuum chamber (6) is maintained at 10 using a metal angle valve (1) and an ion pump (2). -9 Pa, inside the vacuum chamber (6), calcium atoms ejected from the atomic furnace are photoionized by a photoionizing laser introduced through the second CF100 quartz observation window (8). 40 Ca + Ions are loaded into a three-dimensional trapping potential well generated on the electrode surface of the chip ion trap, and a red detuned laser and an 866nm cooling laser are introduced through the second CF100 quartz observation window (8) to... 40 Ca + Ions are subjected to Doppler cooling; blue detuned laser and red detuned laser are applied together to the confinement through the second CF100 quartz observation window (8). 40 Ca + Phonon lasers are generated on ions.

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