CN115343541A - Method, storage medium and system for expanding microwave measurement bandwidth and sensitivity - Google Patents
Method, storage medium and system for expanding microwave measurement bandwidth and sensitivity Download PDFInfo
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Abstract
The invention relates to a method for expanding microwave measurement bandwidth and sensitivity, which comprises the following steps: constructing a microwave electric field sensor of a rydberg atom; radiating signal microwaves and local microwaves into a rubidium atom steam pool to realize interference, and measuring beat frequency signals formed by the interference through a Reidberg atom microwave electric field sensor; the measurement bandwidth and the sensitivity of the microwave electric field to be measured are improved by the auxiliary microwave electric field. The invention also provides a storage medium and a system for expanding the microwave measurement bandwidth and sensitivity, and the method, the storage medium and the system for expanding the microwave measurement bandwidth and sensitivity solve the problem that the microwave electric field frequency is limited by the discrete energy level of the Reidberg, and can realize higher measurement sensitivity in the expanded linear response interval.
Description
Technical Field
The invention belongs to the technical field of microwave measurement, and particularly relates to a method, a storage medium and a system for expanding microwave measurement bandwidth and sensitivity.
Background
The method for accurately measuring the microwave electric field intensity has important application in the aspects of radar, communication, remote sensing, nondestructive detection and the like. In recent years, quantum sensors based on atoms have been developed rapidly, and people have achieved higher accuracy and sensitivity than conventional measurements by using the quantum characteristics of atoms. Compared with the traditional electronic measurement means, the microwave electric field sensor based on the rydberg atoms has the unique advantages of full wave band, traceability to basic physical constants, self calibration, full optical reading without interference of electronic dark current noise and the like in the aspect of measuring microwaves, and is widely concerned and researched.
Although people can select the states of the rydbergs with different main quantum numbers n to further show the electric field measurement in the range from hundreds of MHz to THz, due to the discrete characteristics of the rydberg atomic energy levels, and when the microwave frequency is far away from the resonant transition frequency between the rydberg energy levels, the measurement sensitivity is rapidly reduced, so that actually, the bandwidth which can be covered by each rydberg energy level is only about 10MHz, and the separation of the rydberg energy levels with different main quantum numbers n is hundreds of MHz, therefore, even if a high-power laser system with the wavelength tunable in a large range can be realized by overcoming the difficulty, the frequency range corresponding to the separation of the rydberg energy levels with different main quantum numbers n cannot be completely compensated.
At present, researchers mainly focus on measuring the resonance between microwave frequency and split energy level by utilizing various energy level splitting effects generated by adding an external field to a target energy level in the effort of expanding the bandwidth of a rydberg atomic microwave electric field sensor. There are mainly static magnetic field and electrostatic field atomic energy level regulation methods, but applying an electrostatic field or static magnetic field to a system can change all atomic energy levels, which undoubtedly causes great troubles to theory and experiment. In 2021, a method for regulating and controlling atomic energy level by using an auxiliary microwave electric field is proposed, and microwave frequency at an interval of n adjacent main quantum numbers is measured by using an auxiliary microwave electric field and a Reidberg electromagnetic induction transparent-Autler-Townes split spectrum. In 2022, it was proposed to introduce a local microwave field (LO field) having a frequency close to that of the signal microwave field (SIG field) by using non-resonant heterodyne technique, and mixing the two fields to achieve highly sensitive measurement in the non-resonant region without affecting the atomic level. This method can cover a wide frequency range of 0-20GHz, but when the microwave frequency is detuned from the atomic level resonant transition frequency, the system changes from a linear response to a nonlinear response, resulting in a sensitivity at detuning that is 20dB lower than at resonance due to the limitations of the non-resonant second order Stark effect, the sensitivity in the non-resonant region being far from the resonant region.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method, a storage medium and a system for expanding the microwave measurement bandwidth and sensitivity, and can realize higher measurement sensitivity in an expanded linear response interval.
In order to achieve the above purposes, the invention adopts the technical scheme that: a method for expanding microwave measurement bandwidth and sensitivity comprises the following steps: constructing a microwave electric field sensor of a rydberg atom; radiating signal microwaves and local microwaves into a rubidium atom steam pool to realize interference, and measuring beat frequency signals formed by the interference through a Reidberg atom microwave electric field sensor; the measurement bandwidth and the sensitivity of the microwave electric field to be measured are improved by the auxiliary microwave electric field.
Further, the auxiliary microwave electric field can regulate and control the position of a target rydberg energy level, the system of the energy levels is a five-level model of the rydberg decorated by the auxiliary microwave, and the energy levels 3, 4 and 5 are the rydberg energy levels with larger main quantum number n.
Further, an Electromagnetic Induced Transparency (EIT) quantum interference effect is achieved using a transition from 1 level to 2 level resonant with the probe optical frequency and a transition from 2 level to 3 level resonant with the coupling optical frequency.
Furthermore, an auxiliary microwave field which resonates with the transition from 5 energy level to 4 energy level is introduced, and the change of 4 energy level is regulated and controlled by selecting the electric field intensity and the frequency of the auxiliary field, so that the effect of enabling the detuned microwave field to be measured to re-resonate with the transition of the target Reedberg energy level is achieved.
Further, in the five-energy-level model of the Reidberg, the 1 energy level is 5S 1/2 2 at an energy level of 5P 3/2 3 energy level of 61D 5/2 4 energy level of 62P 3/2 5 energy level of 62P 3/2 。
Further, after the auxiliary microwave electric field acts, the detuned microwave field resonates with the target rydberg level transition again, and the response of the microwave electric field to be measured returns to the sensitive linear relation from the insensitive nonlinearity again.
Further, the signal microwaves and the local microwaves are radiated into the rubidium atom steam pool through two microwave antennas respectively, wherein polarization of the local microwaves is linear polarization and is constant.
Further, the microwave antenna is a rectangular horn antenna.
The present invention provides a storage medium characterized in that:
the storage medium has stored therein a computer program, wherein the computer program is arranged to execute the method of extending the bandwidth and sensitivity of microwave measurements when running.
The invention also provides a system for expanding the microwave measurement bandwidth and sensitivity, which comprises: the building module of the rydberg atom microwave electric field sensor is used for building the rydberg atom microwave electric field sensor so as to measure beat frequency signals; the beat frequency module is used for radiating signal microwaves and local microwaves into the rubidium atom steam pool to realize interference, and measuring beat frequency signals formed by interference through a Reidberg atom microwave electric field sensor; and the auxiliary microwave module is used for improving the measurement bandwidth and the sensitivity of the microwave electric field to be measured through the auxiliary microwave electric field.
The invention has the following effects: the energy level of the rydberg atoms is regulated and controlled by an auxiliary microwave field, so that the decorated energy level of the auxiliary microwave field can resonate with the microwave field to be detected again, namely the response of the system to the microwave field to be detected is changed from insensitive second-order nonlinear interaction to sensitive first-order linear interaction, and the sensitivity of the sensor is improved. And on the basis that the linear response interval of one rydberg level transition is increased by at least one hundred MHz magnitude, the linear response interval basically covers the interval of adjacent rydberg levels, so that the problem that the frequency of a microwave electric field is limited by the discrete energy levels of the rydberg is solved, and higher measurement sensitivity can be realized in the expanded linear response interval.
Drawings
FIG. 1 is a flow chart of the steps of a method of expanding the bandwidth and sensitivity of microwave measurements according to the present invention;
FIG. 2 is a schematic diagram of experimental energy levels;
FIG. 3 is a schematic view of an experimental apparatus;
FIG. 4 is a schematic diagram of EIT-AT split spectra generated by a local microwave field before and after decoration by an auxiliary microwave field;
FIG. 5 is a schematic diagram illustrating an influence of an auxiliary microwave electric field on a beat signal output by a mixer in a heterodyne method;
FIG. 6 is a schematic diagram showing the relationship between the beat signal amplitude and the microwave electric field strength to be measured at the resonance point and the detuning point by the auxiliary microwave field intervention front and back heterodyne method;
fig. 7 is a schematic diagram illustrating a relationship between microwave power sensitivity and microwave detuning amount measured before and after intervention of an auxiliary microwave field in an off-resonance heterodyne method.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1-3, the method for expanding the bandwidth and sensitivity of microwave measurement provided by the present invention comprises the steps of:
s1, constructing a microwave electric field sensor of a Reidberg atom;
specifically, utilize 87 Rb atoms, involving Reedberg atoms consisting of four energy levels, 5S each 1/2 (F＝2)，5P 3/2 (F＝3)，61D 5/2 (F＝4)，62P 3/2 (F = 3), but is not limited to these specific atomic energy levels. Wherein 780nm laser (probe light) is applied to 5S 1/2 (F＝2)→5P 3/2 (F = 3) transition, and a laser beam (coupled light) of 480nm is applied to 5P 3/2 (F＝3)→61D 5/2 Transition of (F = 4), and action of microwave of 9.2GHz on 61D 5/2 (F＝4)→62P 3/2 (F = 3). The 780nm laser (probe light) and the 480nm laser (coupling light) are overlapped and propagated in a rubidium atom steam pool to form Electromagnetic Induction Transparency (EIT) of the Reidberg atom, at the moment, after a microwave electric field is applied, the EIT can generate Autler-Townes splitting, and the change of the microwave electric field intensity can be measured through the change of the transmissivity of the probe light at the EIT resonance position.
In one particular embodiment, the parameters of the laser include: the detection optical power is 60 microwatts, the diameter in rubidium atom steam is about 800 microns, the coupling optical power is 50 milliwatts, and the diameter in rubidium atom steam is about 900 microns.
In this embodiment, the intensity of the coupled light is modulated by a 30kHz sine cycle using an acousto-optic modulator, the 30kHz modulation signal is simultaneously sent to a lock-in amplifier as a reference signal, and then the signal-to-noise ratio of the probe light is improved using the lock-in amplifier. In the experiment, the frequency of the probe light is locked at 5S 1/2 (F＝2)→5P 3/2 (F = 3) transition, frequency locking of coupled light to 5P 3/2 (F＝3)→61D 5/2 (F = 4). When microwaves are applied to the rubidium atom steam pool, the intensity of the detection light changes, and the intensity of the microwave electric field is obtained by measuring the change of the detection light transmittance (or light intensity).
S2, radiating signal microwaves and local microwaves into a rubidium atom steam pool to realize interference, and measuring beat frequency signals formed by the interference through a Reidberg atom microwave electric field sensor;
specifically, signal microwaves and local microwaves are radiated into a rubidium atom steam pool through two microwave antennas respectively, interference is achieved in the rubidium atom steam pool, and interfered beat frequency signals are measured through a rydberg atom microwave electric field sensor, namely the beat frequency signals interfered by the two microwaves are obtained through measuring periodic sinusoidal changes of detection light intensity along with time. The amplitude of the beat signal is proportional to the microwave electric field strength of the signal, and thus the microwave electric field strength can be obtained by measuring the amplitude of the beat signal.
Taking a specific example as an illustration, the transmission of microwave electric fields to rubidium atom vapor pools is achieved by a rectangular horn antenna which can provide a very good linearly polarized microwave signal under far field conditions. The beat frequency signal of interference is measured by a microwave electric field sensor of a rydberg atom, namely, the periodic sinusoidal change of the detection light intensity along with time is obtained, and the beat frequency is equal to the frequency difference delta of two microwave electric fields MW . Amplitude E of local microwave electric field LO Far greater than the amplitude E of the signal microwave electric field SIG While detecting the light intensity T p The relationship with the amplitude of the signal microwave electric field is as follows:
T p ∝E LO +E SIG sin(Δ MW t)
it will be appreciated that in this embodiment only variations in amplitude are of interest, and therefore phase information of the local microwave electric field and the signal microwave electric field is ignored.
In one embodiment, the frequency difference between the two microwave electric fields, i.e. the frequency difference between the signal microwave and the local microwave electric field, is 1kHz, the amplitude E of the local microwave electric field LO =6.43mV/cm, amplitude E of signal microwave electric field SIG And the gain of the two antennas is 10dB, wherein the value is 1.73 mV/cm. Can adjust strong field power in order to adjust under the no magnetic field condition, the detection light that beat frequency signal caused transmits the oscillation peak value of light intensity, can adjust according to the actual measurement demand, requires to have clear 1kHz beat frequency signal in the light intensity behind the detection light sees through rubidium pond. In practice, two microwave electric fieldsThe frequency difference of (2) can reach 100kHz, and is limited by the bandwidth of the phase-locked amplifier adopted in the experiment to be 100 kHz.
S3, improving the measurement bandwidth and sensitivity of the microwave electric field to be measured through the auxiliary microwave electric field;
specifically, the auxiliary microwave electric field can regulate and control the position of the target rydberg level: as shown in fig. 2, the energy level system in this embodiment is a five-level model of the riedberg under the auxiliary microwave decoration, where the 3, 4, and 5 energy levels are the riedberg levels with a larger number n of principal quanta. By using and detecting the optical frequency omega p Transition from 1 to 2 level of resonance, and coupling with optical frequency omega c The transition from 2 level to 3 level of resonance realizes the Electromagnetic Induction Transparent (EIT) quantum interference effect, and the part is a typical step type three-level model for realizing EIT. Further, the frequency of the transition resonance with the 4 level to 3 level is added as ω t When the intensity E of the microwave field MW Sufficiently large, a symmetric Autler-Townes splitting can be observed on the basis of the EIT signal, with a spectral splitting width Δ f at resonance MW The ratio frequency omega to the microwave field MW And (4) positively correlating. A traditional method for measuring the electric field intensity of a microwave to be measured by EIT-AT splitting requires that the frequency of a field to be measured and the transition frequency of a target Reedberg energy level resonate. When the frequency of the field to be measured is detuned from the atomic resonance transition frequency, the EIT-AT split becomes asymmetric, AT which time Δ f MW And omega MW The linearity is not existed any more, and the sensitivity of measuring the microwave electric field intensity by using the beat frequency signal is greatly reduced. In the case of detuning, the frequency by introducing resonance with a transition from 5 to 4 levels is ω t The change of 4 energy levels is regulated and controlled by selecting the electric field intensity and the frequency of the auxiliary field, so that the detuned microwave field to be tested can resonate with the transition of the target rydberg energy level again, and the amplitude of the beat frequency signal is improved.
In this embodiment, the 1 level is 5S 1/2 2 energy level of 5P 3/2 3 energy level of 61D 5/2 4 energy level of 62P 3/2 5 energy level of 62P 3/2 。
To illustrate with a specific example, as shown in fig. 4, the EIT spectrum was first measured without any microwave electric field applied, exhibiting a narrow electromagnetically induced transparent peak. The frequency of the microwave electric field to be measured is set to be the same as the transition frequency of the rydberg atom energy levels 3 and 4, so that the EIT-AT splitting of the microwave electric field in resonance is measured, and the EIT-AT splitting double peaks caused by the microwave electric field in resonance are symmetrical. Then setting the frequency of the microwave electric field to be measured to be 14.6MHz different from transition frequencies of energy levels 3 and 4 of rydberg atoms, namely detuning 14.6MHz, measuring EIT-AT splitting AT the moment, displaying that an EIT-AT splitting double peak caused by the microwave electric field during detuning is asymmetric, and displaying that along with the increase of the detuning quantity, although the interval of the double peaks is increased, the asymmetry is also increased, namely the interval of the EIT-AT splitting during detuning is not in linear relation with the intensity of the microwave electric field to be measured any more, specifically, the intensity of a peak close to the resonance with the transition frequency of the atomic energy level is stronger and weaker, and the intensity of a peak far away from the resonance is weaker until the disappearance, namely, when far detuning is meant, the microwave electric field does not interact with the rydberg atoms.
When the transition frequency of the microwave electric field to be detected and the atomic resonance is detuned by 14.6MHz, an auxiliary microwave electric field is added, the intensity of the auxiliary microwave electric field is adjusted, the asymmetric EIT-AT splitting double peaks can be enabled to return to symmetry again, AT the moment, the splitting interval is different from the resonance time, because the position of the rydberg atomic energy level is changed after the auxiliary microwave electric field is adjusted and controlled, the newly adjusted and controlled energy level is called as the decorated energy level, and the size of the transition matrix element between the decorated energy levels is changed AT the same time, so that the EIT-AT splitting interval is different under the same microwave electric field intensity to be detected. However, after the auxiliary microwave electric field acts, the detuned microwave field is in transition resonance with the target rydberg level again, and the response of the system to the microwave electric field to be measured is returned to the sensitive linear relation from the insensitive nonlinearity.
It will be appreciated that in this section of the experimental demonstration, the frequency of the coupled light is not changed, and the probe light frequency sweep range is also not changed, which means that it is successful to manipulate only the position of the target rydberg level using the auxiliary microwave electric field.
As shown in fig. 5, when the microwave electric field to be measured and the atomic transition resonance, a local microwave electric field is introduced to obtain a beat signal at this time. Then the frequency of the microwave electric field to be measured is changed from resonance to detune-16 MHz, and the amplitude of the beat frequency signal is sharply reduced under the same experimental conditions. Finally, after the auxiliary microwave electric field is added, the amplitude of the beat frequency signal becomes larger. Therefore, the auxiliary microwave electric field improves the amplitude of the beat frequency signal output by the mixer when the microwave electric field to be detected is detuned, and provides basic guarantee for improving the bandwidth and the sensitivity of the detector.
As shown in fig. 6, the amplitude of the beat signal output by the mixer is recorded by varying the intensity of the electric field of the microwave under test. And comparing the measurement sensitivity of the microwave electric field under three conditions of resonance (detuning amount = 0) of the microwave electric field to be measured, detuning amount = -22MHz and detuning amount = -22MHz under the action of the auxiliary microwave electric field.
At the resonance point, the amplitude of the beat frequency signal of the common heterodyne method changes along with the electric field intensity of the microwave to be measured, and the measurable value of the minimum electric field intensity is 18 MuV/cm. | Δ LO At the detuning point of = -22MHz, the amplitude of beat signals of the common heterodyne method changes along with the intensity of the microwave electric field to be measured, and the minimum electric field intensity can be measured to be 180 muV/cm.
At the detuning point, the amplitude of the beat signal of the heterodyne method with the intervention of the auxiliary field changes along with the intensity of the microwave electric field to be measured, and the minimum electric field intensity can be measured to be 18 muV/cm. The heterodyne method of the auxiliary field intervention can reach substantially the measurement limit at resonance.
As shown in fig. 7, under different detuning amounts of the microwave electric field to be measured, the improvement of the measurement sensitivity of the auxiliary microwave electric field to the microwave electric field to be measured in the range from detuning amount-100 MHz to 0MHz was studied by optimizing the strength of the auxiliary microwave electric field. As shown in FIG. 7, the dotted line indicates the minimum measurement limit and the amount of detuning without the intervention of auxiliary field
The relationship of (1). The circle dotted line is the minimum measurement limit and the detuning amount under the condition of best matching auxiliary field intervention
Is measured in the graph (c). The intervention of the auxiliary field can achieve substantially better measurement sensitivity throughout the detuning interval, which is reflected in its smaller measurement limits. Therefore, it can be concluded from the experimental results that when the auxiliary field exists, the minimum microwave power is greatly increased and can be increased by 20dB (100 times) to the maximum in the detuning interval of the frequency from 0 to-100 MHz, and the electric field strength is proportional to the arithmetic square root of the power, i.e. the electric field strength can be increased by about 10 times of the measurement sensitivity. The method proves that on the basis that the linear response interval of one rydberg level transition can be increased by at least one hundred MHz, the adjacent rydberg level interval is basically covered, the problem that the microwave electric field frequency is limited by the discrete energy level of the rydberg is solved, and higher measurement sensitivity can be realized in the expanded linear response interval.
The invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of implementing a method of extending the bandwidth and sensitivity of microwave measurements.
It should be noted that the storage media described herein can be computer readable signal media or storage media or any combination of the two. A storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or any combination of the foregoing. More specific examples of the storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, or device. In this application, however, the storage medium may comprise a propagated data signal with the computer-readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A storage medium may also be any computer-readable medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The invention also provides a system for expanding the microwave measurement bandwidth and sensitivity, which comprises:
the building module of the rydberg atom microwave electric field sensor is used for building the rydberg atom microwave electric field sensor so as to measure the beat frequency signal;
the microwave adjusting module is used for generating local microwaves with constant phases and signal microwaves with adjustable polarization directions, and radiating the local microwaves and the signal microwaves into the rubidium atom steam pool to realize interference;
and the conversion module is used for converting the measurement of the microwave polarization into the measurement of the beat frequency amplitude.
It can be seen from the above embodiments that the invention can regulate the rydberg atomic energy level by an auxiliary microwave field, so that the decorated energy level of the auxiliary microwave field can resonate with the microwave field to be measured again, that is, the response of the system to the microwave field to be measured changes from insensitive second-order nonlinear interaction to sensitive first-order linear interaction, which is helpful to improve the sensitivity of the sensor. And on the basis that the linear response interval of one rydberg level transition is increased by at least one hundred MHz magnitude, the linear response interval basically covers the interval of adjacent rydberg levels, so that the problem that the frequency of a microwave electric field is limited by the discrete energy levels of the rydberg is solved, and higher measurement sensitivity can be realized in the expanded linear response interval.
The method and system of the present invention are not limited to the embodiments described in the detailed description, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.
Claims (10)
1. A method for expanding microwave measurement bandwidth and sensitivity is characterized by comprising the following steps:
constructing a microwave electric field sensor of a rydberg atom;
radiating signal microwaves and local microwaves into a rubidium atom steam pool to realize interference, and measuring beat frequency signals formed by the interference through a Reidberg atom microwave electric field sensor;
the measurement bandwidth and the sensitivity of the microwave electric field to be measured are improved through the auxiliary microwave electric field.
2. The method for expanding the bandwidth and the sensitivity of microwave measurement according to claim 1, wherein:
the auxiliary microwave electric field can regulate and control the position of a target Reidberg energy level, the system of the energy levels is a Reidberg five-level model decorated by auxiliary microwaves, and 3, 4 and 5 energy levels are Reidberg energy levels with larger main quantum number n.
3. A method of extending the bandwidth and sensitivity of microwave measurements according to claim 2, wherein:
an Electromagnetic Induced Transparency (EIT) quantum interference effect is achieved with a transition from 1 to 2 levels resonant with the probe optical frequency and a transition from 2 to 3 levels resonant with the coupling optical frequency.
4. A method for expanding the bandwidth and sensitivity of microwave measurements as claimed in claim 2, wherein:
the change of the 4 energy level is regulated and controlled by introducing an auxiliary microwave field which resonates with the transition from the 5 energy level to the 4 energy level and selecting the electric field intensity and the frequency of the auxiliary field, so that the detuned microwave field to be measured can re-resonate with the transition of the target rydberg energy level.
5. A method for expanding the bandwidth and sensitivity of microwave measurements as claimed in claim 2, wherein:
in the five-level Reedberg model, the 1 level is 5S 1/2 2 energy level of 5P 3/2 3 energy level of 61D 5/2 4 energy level of 62P 3/2 5 energy level of 62P 3/2 。
6. The method for expanding the bandwidth and the sensitivity of microwave measurement according to claim 4, wherein the method comprises the following steps:
after the auxiliary microwave electric field acts, the detuned microwave field resonates with the target Reedberg level transition again, and the response of the microwave electric field to be measured returns to the sensitive linear relation from the insensitive nonlinearity.
7. The method for expanding the bandwidth and the sensitivity of microwave measurement according to claim 1, wherein:
the signal microwaves and the local microwaves are radiated into the rubidium atom steam pool through two microwave antennas respectively, wherein polarization of the local microwaves is linear polarization and is constant.
8. A method of extending the bandwidth and sensitivity of microwave measurements as claimed in any one of claims 7, wherein:
the microwave antenna is a rectangular horn antenna.
9. A storage medium, characterized by:
the storage medium has stored thereon a computer program, wherein the computer program is arranged to execute the method of extending microwave measurement bandwidth and sensitivity as claimed in any of claims 1-8 when executed.
10. A system for expanding microwave measurement bandwidth and sensitivity, comprising:
the building module of the rydberg atom microwave electric field sensor is used for building the rydberg atom microwave electric field sensor so as to measure beat frequency signals;
the beat frequency module is used for radiating signal microwaves and local microwaves into the rubidium atom steam pool to realize interference, and measuring beat frequency signals formed by interference through a Reidberg atom microwave electric field sensor;
and the auxiliary microwave module is used for improving the measurement bandwidth and the sensitivity of the microwave electric field to be measured through the auxiliary microwave electric field.
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| CN116047181B (en) * | 2023-03-31 | 2023-06-06 | 北京量子信息科学研究院 | Device and method for measuring microwave field intensity |
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