Bandwidth extension method and bandwidth extension apparatus based on rydberg atoms

Abstract

The application provides a bandwidth expansion method and device based on Rydberg atoms. The bandwidth expansion method comprises processing a received original signal to obtain a plurality of microwave signals corresponding to the original signal, wherein the plurality of microwave signals comprise a first microwave signal and a second microwave signal; performing mixing processing on the first microwave signal by a first atomic gas chamber to obtain a first bandwidth signal, and performing mixing processing on the second microwave signal by a second atomic gas chamber to obtain a second bandwidth signal; and synthesizing the first bandwidth signal and the second bandwidth signal by using a frequency division multiplexing method to realize bandwidth expansion. According to some embodiments, different Rydberg final states are prepared by using microwave signals of different frequencies, and the original signal is decomposed into a plurality of signals by using a frequency division multiplexing technology to realize multi-channel data transmission by loading the signals into the microwave signals, thereby realizing high-bandwidth multi-channel data transmission communication and bandwidth expansion.

Description

Technical Field

[0001] This application relates to the field of quantum communication, and more specifically, to a bandwidth extension method and a bandwidth extension device based on Rydberg atoms. Background Technology

[0002] In recent years, research on Rydberg states in atoms has received widespread attention both domestically and internationally. Rydberg atoms possess advantages such as high sensitivity to electric fields, long radiation lifetimes, large response bandwidths, and large transition dipole moments. Therefore, quantum interference effects based on Rydberg atoms can achieve high-precision measurements of electric field strength from DC to terahertz frequencies, with higher sensitivity than traditional dipole antennas.

[0003] Currently, Rydberg quantum receivers can be widely used in fields such as frequency, amplitude, and phase modulation microwave electric field measurement, spectrum analysis, high-resolution radar, and satellite communications. 133 For a Cs Rydberg quantum receiver, an 852nm laser is needed as the probe light and a 509nm laser as the coupling light to build the receiver. 133 Cs Rydberg state-induced electromagnetic induction transparent spectroscopy enables the reception and measurement of weak electric fields. When the frequencies of the 852nm and 509nm lasers are adjusted to their two-photon resonance positions, the probe and coupling beams interact with... 133 Cs interactions generate electromagnetically induced transparency (EIT) spectral transmission peaks. When video signals, microwave fields, or communication signals resonate with the energy levels of neighboring Rydberg atoms, Autler-Townes (AT) splitting occurs at these transmission peaks. The degree of AT splitting depends on the intensity of the external microwave or communication signal, which is proportional to the Rabi frequency of the corresponding transition. Rydberg atoms can prepare Rydberg states using probe and coupling light to receive and transmit microwave electric field signals. Compared to traditional field meters and dipole antennas, this method offers advantages such as high measurement sensitivity, high bandwidth, low transmission loss, and strong anti-interference capabilities. It not only maintains compatibility with traditional fiber optic communication but also enables wireless transmission of video and other communication signals, laying the foundation for the development of new wireless communication technologies, weather forecasting, and remote sensing mapping.

[0004] Currently, the development of Rydberg sensors mainly focuses on improving the sensitivity of electric field measurements and overcoming the technical bottleneck of bandwidth limitation. Although Rydberg atomic antennas have achieved real-time transmission of signals such as audio through amplitude modulation technology, high-bandwidth video transmission and communication solutions have not yet been proposed and proven due to the limitations of Rydberg measurement bandwidth, sensitivity, video carrier, and decoding methods.

[0005] In 2019, the National Institute of Standards and Technology (NIST) in the United States constructed corresponding EIT spectra by placing Rb and Cs, two different alkali metal atoms, in the same gas chamber. Using a Rydberg atom antenna to detect and receive amplitude-modulated carrier waves, they achieved communication and transmission of two audio signals within the same chamber. However, this method requires at least four lasers to generate the probe and coupling light for the Rydberg state preparation process, resulting in a complex overall device structure. Furthermore, the presence of both Rb and Cs alkali metal atoms leads to a complex internal composition within the gas chamber, making it prone to crosstalk.

[0006] In 2020, Jing Mingyong's team at Shanxi University developed a Rydberg electric field measurement system for atomic superheterodyne measurements. This atomic superheterodyne measurement system has a capability of 5.5 μV / m / Hz. 1 / 2 The system boasts high sensitivity, with a minimum detectable electric field strength of 78 nV / m. While it offers high sensitivity in electric field measurement, it also requires stringent shielding against the surrounding electromagnetic environment. Furthermore, achieving high sensitivity necessitates an extended measurement time, resulting in a narrow instantaneous response bandwidth for the transmitted signal. This sacrifices measurement bandwidth while maintaining sensitivity, making it unsuitable for applications demanding high bandwidth. Summary of the Invention

[0007] This application aims to propose a bandwidth extension method and device based on Rydberg atoms to solve the problem of bandwidth limitation in Rydberg quantum receivers.

[0008] According to one aspect of this application, a bandwidth extension method based on Rydberg atoms is proposed, comprising processing a received original signal to obtain multiple microwave signals corresponding to the original signal, wherein the multiple microwave signals include a first microwave signal and a second microwave signal; performing frequency mixing processing on the first microwave signal through a first atomic gas cell to obtain a first bandwidth signal, and performing frequency mixing processing on the second microwave signal through a second atomic gas cell to obtain a second bandwidth signal; and using a frequency division multiplexing method to synthesize the first bandwidth signal and the second bandwidth signal to achieve bandwidth extension.

[0009] According to some embodiments, before mixing the first microwave signal through the first atomic gas cell to obtain the first bandwidth signal, and mixing the second microwave signal through the second atomic gas cell to obtain the second bandwidth signal, the bandwidth expansion method further includes: exciting the alkali metal atoms in the first atomic gas cell and the second atomic gas cell from the ground state to the Rydberg initial state.

[0010] According to some embodiments, processing the received original signal to obtain multiple microwave signals corresponding to the original signal includes: decomposing the original signal to obtain multiple decomposed signals, wherein the multiple decomposed signals include a first decomposed signal and a second decomposed signal; mixing the first decomposed signal and a first mixing signal to obtain the first microwave signal; and mixing the second decomposed signal and the second mixing signal to obtain the second microwave signal.

[0011] According to some embodiments, the first microwave signal is mixed using a first atomic gas cell to obtain a first bandwidth signal, and the second microwave signal is mixed using a second atomic gas cell to obtain a second bandwidth signal, including: mixing the first microwave signal using a first local oscillator microwave in the first atomic gas cell; and mixing the second microwave signal using a second local oscillator microwave in the second atomic gas cell.

[0012] According to some embodiments, the first microwave signal is less than the maximum transmittable bandwidth of the electromagnetically induced transparent signal generated in the first atomic gas cell; the second microwave signal is less than the maximum transmittable bandwidth of the electromagnetically induced transparent signal generated in the second atomic gas cell.

[0013] According to some embodiments, the received original signal is processed to obtain multiple microwave signals corresponding to the original signal, including: in response to the received original signal, decomposing the original signal into multiple microwave signals according to the bandwidth of the original signal; in response to the received original signal, decomposing the original signal into multiple microwave signals according to the information carried by the original signal; or in response to the received original signal, decomposing the original signal into multiple microwave signals according to the encoding method of the original signal.

[0014] According to one aspect of this application, a bandwidth extension device based on Rydberg atoms is proposed, comprising: a microwave signal generation unit for processing a received original signal to obtain a plurality of microwave signals corresponding to the original signal, wherein the plurality of microwave signals includes a first microwave signal and a second microwave signal; a first atomic gas cell for performing frequency mixing processing on the first microwave signal to obtain a first bandwidth signal; a second atomic gas cell for performing frequency mixing processing on the second microwave signal to obtain a second bandwidth signal; and a bandwidth signal synthesis unit for synthesizing the first bandwidth signal and the second bandwidth signal using a frequency division multiplexing method to achieve bandwidth extension.

[0015] According to some embodiments, the bandwidth extension device further includes: a first laser for exciting alkali metal atoms in the first or second atomic gas chamber from the ground state to a first excited state; and a second laser for exciting alkali metal atoms in the first or second atomic gas chamber from the first excited state to a Rydberg state.

[0016] According to some embodiments, the wavelength of the first laser is 852 nm, and the wavelength of the second laser is 509 nm.

[0017] According to some embodiments, the alkali metal atom is a cesium atom.

[0018] According to some embodiments of this application, different Rydberg final states are prepared using microwaves of different frequencies, and frequency division multiplexing technology is used to decompose the original signal into multiple signals to be loaded into the microwave signal to realize the transmission of multi-channel data, thereby realizing high-bandwidth multi-channel data transmission communication and bandwidth expansion.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The above and other objectives, features, and advantages of this application will become more apparent by referring to the accompanying drawings and describing exemplary embodiments in detail.

[0021] Figure 1 A flowchart of a bandwidth extension method based on Rydberg atoms according to an example embodiment of this application is shown.

[0022] Figure 2 A block diagram of a bandwidth extension device based on Rydberg atoms according to an example embodiment of this application is shown.

[0023] Figure 3 A block diagram of another bandwidth extension device based on Rydberg atoms according to an example embodiment of this application is shown.

[0024] Figure 4 A schematic diagram of a bandwidth extension device based on Rydberg atoms according to an example embodiment of this application is shown.

[0025] Figure 5 This diagram illustrates an energy level transition of an alkali metal atom according to an example embodiment of this application. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0027] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, apparatus, or operations may be employed. In these cases, well-known structures, methods, apparatuses, implementations, materials, or operations will not be shown or described in detail.

[0028] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0029] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0030] As mentioned earlier, Rydberg atoms prepare Rydberg states using probe light and coupling light to receive and transmit microwave electric field signals. Compared to traditional electric field meters and dipole antennas, they offer advantages such as high measurement sensitivity, high bandwidth, low transmission loss, and strong anti-interference capabilities. They not only maintain compatibility with traditional fiber optic communication but also enable wireless transmission of video and other communication signals, laying the foundation for the development of new wireless communication technologies, weather forecasting, and remote sensing mapping. However, current development of Rydberg sensors primarily focuses on improving electric field measurement sensitivity and overcoming bandwidth limitations. While Rydberg atom antennas have achieved real-time transmission of audio and other signals through amplitude modulation, high-bandwidth video transmission and communication solutions have not yet been proposed or proven due to limitations in Rydberg measurement bandwidth, sensitivity, video carrier, and decoding methods.

[0031] According to some embodiments of this application, different Rydberg final states are prepared using microwaves of different frequencies, and frequency division multiplexing technology is used to decompose the original signal into multiple signals to be loaded into the microwave signal to realize the transmission of multi-channel data, thereby realizing high-bandwidth multi-channel data transmission communication and bandwidth expansion.

[0032] The specific embodiments according to this application will now be described in detail with reference to the accompanying drawings.

[0033] Figure 1 This diagram illustrates a bandwidth extension method based on Rydberg atoms according to an example embodiment of this application. The following is a flowchart of such a method. Figure 1 Taking an example, a bandwidth extension method based on Rydberg atoms according to an example embodiment of this application will be described in detail.

[0034] like Figure 1 As shown, in step S101, the received original signal is processed to obtain multiple microwave signals corresponding to the original signal, wherein the multiple microwave signals include a first microwave signal and a second microwave signal.

[0035] In step S101, in order to expand the bandwidth, the original signal can be split into multiple microwave signals; or in order to transmit more information about the original signal, the amplitude, phase and / or frequency of the original signal can be split into multiple microwave signals; or in order to achieve encrypted transmission of the signal, the original signal can be encoded in different ways to obtain multiple microwave signals.

[0036] Specifically, in step S101, in response to the received original signal, the original signal is decomposed into multiple microwave signals according to the bandwidth of the original signal, so as to achieve bandwidth expansion.

[0037] Alternatively, in step S101, in response to the received original signal, the original signal is decomposed into multiple microwave signals according to the information carried by the original signal, so as to transmit updated signal information.

[0038] Alternatively, in step S101, in response to the received original signal, the original signal is decomposed into multiple microwave signals according to the encoding method of the original signal, so as to achieve secure transmission of the original signal.

[0039] According to an embodiment of this application, the multiple microwave signals in step S101 are obtained by decomposing and mixing the original signals.

[0040] Specifically, step S101 includes:

[0041] First, the original signal is decomposed to obtain multiple decomposed signals, wherein the multiple decomposed signals include a first decomposed signal and a second decomposed signal;

[0042] Then, the first decomposed signal and the first mixing signal are mixed to obtain the first microwave signal, and the second decomposed signal and the second mixing signal are mixed to obtain the second microwave signal.

[0043] In step S103, the first microwave signal is mixed using the first atomic gas cell to obtain a first bandwidth signal, and the second microwave signal is mixed using the second atomic gas cell to obtain a second bandwidth signal.

[0044] According to an embodiment of this application, before step S103, the alkali metal atoms in the first atomic gas chamber and the second atomic gas chamber need to be excited from the ground state to the Rydberg initial state. During step S103, the first atomic gas chamber and the second atomic gas chamber transition from the Rydberg initial state to the Rydberg final state, respectively.

[0045] According to an embodiment of this application, in step S103, the first microwave signal is mixed using a first local oscillator microwave through the first atomic gas cell; and the second microwave signal is mixed using a second local oscillator microwave through the second atomic gas cell. The frequency of the first local oscillator microwave is the transition frequency from the Rydberg initial state to the Rydberg final state in the first atomic gas cell, and the frequency of the second local oscillator microwave is the transition frequency from the Rydberg initial state to the Rydberg final state in the second atomic gas cell.

[0046] It should be noted that, in order to facilitate the use of superheterodyne technology to perform mixing processing on the first microwave signal and the second microwave signal in step S103, the frequency difference between the center frequency of the first microwave signal and the center frequency of the first local oscillator microwave is not less than the bandwidth of the first bandwidth signal, and the frequency difference between the center frequency of the second microwave signal and the center frequency of the second local oscillator microwave is not less than the bandwidth of the second bandwidth signal.

[0047] In a specific embodiment, for example, the center frequencies of the first decomposed signal and the second decomposed signal are 50MHz and the bandwidth is 3MHz; the first mixing signal and the second mixing signal are 2.554GHz and 23.954GHz, respectively. The first decomposed signal and the first mixing signal are mixed to obtain a first microwave signal with a frequency of 2.504GHz, and the second decomposed signal and the second mixing signal are mixed to obtain a second microwave signal with a frequency of 23.904GHz. The frequencies of the first local oscillator microwave and the second local oscillator microwave are 2.5GHz and 23.9GHz, respectively. The center frequencies of the first bandwidth signal and the second bandwidth signal are 4MHz and 3MHz, respectively. The frequency difference between the center frequency of the first microwave signal and the center frequency of the first local oscillator microwave is 4MHz, which is not less than the bandwidth of the first bandwidth signal (3MHz). The frequency difference between the center frequency of the second microwave signal and the center frequency of the second local oscillator microwave is 4MHz, which is not less than the bandwidth of the second bandwidth signal (3MHz).

[0048] In step S105, the first bandwidth signal and the second bandwidth signal are synthesized using a frequency division multiplexing method to achieve bandwidth expansion.

[0049] It should be noted that, in order to ensure reliable transmission of the original signal, the bandwidth of the multiple microwave signals after processing the original signal needs to be less than the maximum transmittable bandwidth of the corresponding atomic gas cell. In a specific embodiment, this means that the bandwidth of the first microwave signal is less than the maximum transmittable bandwidth of the electromagnetically induced transparent signal generated in the first atomic gas cell; and the bandwidth of the second microwave signal is less than the maximum transmittable bandwidth of the electromagnetically induced transparent signal generated in the second atomic gas cell.

[0050] In step S105, a larger bandwidth expansion can be achieved by aggregating multiple bandwidth signals together.

[0051] according to Figure 1 The illustrated embodiment utilizes microwaves of different frequencies to prepare different Rydberg final states and employs frequency division multiplexing technology to decompose the original signal into multiple signals to be loaded into the microwave signal to achieve multi-channel data transmission, thereby realizing high-bandwidth multi-channel data transmission communication and bandwidth expansion.

[0052] As mentioned above, if the amplitude, phase, and / or frequency information of the original signal is split into multiple microwave signals in step S101, then the phase signal measurement of the original signal can be achieved using the superheterodyne measurement method employed in step S103. If, in step S101, the original signal is encoded using different methods to obtain multiple microwave signals, then... Figure 1 The illustrated embodiment enables secure communication and transmission of the original signal, thereby improving the security of signal transmission.

[0053] The above description primarily focuses on the methodological aspects of the embodiments of this application. Those skilled in the art should readily recognize that, based on the operations or steps described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Those skilled in the art can implement the described functionality in different ways for each specific operation or method, and such implementations should not be considered beyond the scope of this application.

[0054] The apparatus embodiments of this application are described below. For details not described in the apparatus embodiments of this application, please refer to the method embodiments of this application.

[0055] Figure 2 This diagram illustrates a bandwidth extension device based on Rydberg atoms according to an example embodiment of this application, such as... Figure 2The bandwidth extension device shown includes a microwave signal generation unit 201, a first atomic gas chamber 203, a second atomic gas chamber 205, and a bandwidth signal synthesis unit 207. The microwave signal generation unit 201 processes the received raw signal to obtain multiple microwave signals corresponding to the raw signal, wherein the multiple microwave signals include a first microwave signal and a second microwave signal. The first atomic gas chamber 203 performs frequency mixing processing on the first microwave signal to obtain a first bandwidth signal. The second atomic gas chamber 205 performs frequency mixing processing on the second microwave signal to obtain a second bandwidth signal. The bandwidth signal synthesis unit 207 synthesizes the first bandwidth signal and the second bandwidth signal using a frequency division multiplexing method to achieve bandwidth extension.

[0056] According to some embodiments of this application, in Figure 2 Based on the bandwidth extension device shown, it also includes a first laser 209 and a second laser 211, as follows: Figure 3 As shown. The first laser 209 is used to excite alkali metal atoms in the first or second atomic gas chamber from the ground state to a first excited state; the second laser 211 is used to excite alkali metal atoms in the first or second atomic gas chamber from the first excited state to a Rydberg state.

[0057] In a specific embodiment, the wavelength of the first laser is 852 nm, and the wavelength of the second laser is 509 nm. The alkali metal atom is a cesium atom.

[0058] Figure 4 This diagram illustrates a bandwidth extension device based on Rydberg atoms according to an example embodiment of this application. Figure 5 This diagram illustrates an energy level transition of an alkali metal atom according to an example embodiment of this application. The following is a schematic diagram of such transitions. Figure 4 and Figure 5 Taking this example, a bandwidth extension implementation process based on Rydberg atoms in an exemplary embodiment of this application will be specifically described.

[0059] First, the alkali metal atoms in atomic gas chambers 1 and 2 are excited from their ground state to the Rydberg initial state. Specifically:

[0060] The first probe light generated by an 852nm laser is locked at approximately 852.358nm by a saturable absorption device. After passing through a half-wave plate, it becomes linearly polarized light with tunable polarization. This light then passes through a dichroic mirror and enters atomic cell 1, which contains Cs atoms (an alkali metal atom). The dichroic mirror reflects 509nm light and transmits 852nm light. The first probe light then passes through two Cs atomic cells (cell 1 and cell 2) to achieve Cs atom 6S… 1 / 2 F = 4 to 6P 3 / 2The transition state with F=5, i.e. Figure 5 The transition resonance of |1>->|2> is achieved by placing a semi-transparent and semi-reflective mirror suitable for 852nm between two atomic gas cells. This allows the 852nm laser to be split into a reflected beam and a transmitted beam at a ratio of 50%. The reflected beam enters one of the detectors to detect the EIT signal, while the transmitted beam enters the other gas cell to achieve its resonant transition. Then, it passes through a dichroic mirror to enter the other detector to detect the EIT signal.

[0061] The coupled light generated by the 509nm laser is locked at 509.007nm by an external reference EIT device. After passing through a half-wave plate, it produces linearly polarized light with an tunable polarization state. The polarization state of this linearly polarized light is parallel to that of the linearly polarized light from the 852nm laser. By adjusting the dichroic mirror, it is ensured that the light enters atomic gas cells 1 and 2 in parallel, opposite, and coincident manner with the 852nm laser, thus realizing the Cs atom 6P. 3 / 2 F = 5 to 65D 5 / 2 The transition state, i.e. Figure 5 The resonant transition from |1>->|2> occurs. At this point, by scanning the wavelength of the 509nm laser near the resonant transition, a distinct EIT transmission spectrum can be observed in both detectors.

[0062] To extend the communication bandwidth based on the Rydberg atomic antenna and achieve secure transmission of the original signal, frequency division multiplexing (FDM) technology is first used to decompose the original signal into multiple communication signals with relatively smaller bandwidths.

[0063] by Figure 4 Taking the two-way signal transmission and bandwidth expansion as an example, if the center frequency of the two communication signals is 50MHz and the bandwidth is 3MHz, and the bandwidth of each communication signal is less than the linewidth of the Rydberg atomic antenna EIT or the maximum transmittable bandwidth of 6MHz.

[0064] Two communication or video signals are amplified by a power amplifier and then mixed with 2.554GHz and 23.954GHz mixer signals respectively to obtain microwave signal 1 and microwave signal 2 at 2.504GHz and 23.904GHz. The bandwidth of microwave signal 1 and microwave signal 2 is 3MHz. 65D is selected respectively. 5 / 2 Up to 66P 3 / 2 The transition resonance frequency is 2.5 GHz (microwave field 1) and 65D. 5 / 2 Up to 67P 3 / 2The transition resonance frequency of 23.9 GHz (microwave field 2) is used as the local oscillator frequency, thereby generating local oscillator microwave 1 and local oscillator microwave 2. Among them, the 2.504 GHz microwave signal 1 and the 2.5 GHz local oscillator microwave 1 enter the horn antenna 1 through a power divider, and receive the signal transmitted by the horn antenna 1 through the atomic gas cell 1. The 23.904 GHz microwave signal 2 and the 23.9 GHz local oscillator microwave 2 enter the horn antenna 2 through a power divider, and then receive the signal transmitted by the horn antenna 2 through the atomic gas cell 2.

[0065] After the mixing effect of atomic gas chamber 1 and atomic gas chamber 2, the two detectors respectively receive communication signals with a center frequency of 4MHz (the frequency difference between microwave signal 1 and local oscillator microwave 1) and a bandwidth of 3MHz. The signals received by the detectors are combined together using frequency division multiplexing / carrier aggregation, that is, the two 3MHz bandwidth signals are combined to achieve bandwidth expansion, reaching up to 6MHz. Similarly, according to Figure 4 The method shown can achieve greater bandwidth expansion by aggregating multiple communication signals together.

[0066] As mentioned earlier, through Figure 4 The bandwidth expansion device shown can decompose the original signal into multiple sub-modules, each carrying different information. These sub-modules are received separately and then synthesized, thereby improving the security and confidentiality of the original signal transmission process.

[0067] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. Furthermore, any changes or modifications made by those skilled in the art based on the ideas of this application, and on the specific implementation methods and application scope of this application, are all within the scope of protection of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A bandwidth extension method based on Rydberg atoms, characterized in that, The method comprises: processing a received original signal to obtain a plurality of microwave signals corresponding to the original signal, wherein the plurality of microwave signals comprises a first microwave signal and a second microwave signal, and the first microwave signal and the second microwave signal have different frequencies; mixing the first microwave signal through a first atomic cell to obtain a first bandwidth signal, and mixing the second microwave signal through a second atomic cell to obtain a second bandwidth signal; synthesizing the first bandwidth signal and the second bandwidth signal by using a frequency division multiplexing method to realize bandwidth expansion. The method further comprises: in response to the received original signal, decomposing the original signal into a plurality of microwave signals according to the bandwidth of the original signal; before mixing the first microwave signal through the first atomic cell to obtain the first bandwidth signal and mixing the second microwave signal through the second atomic cell to obtain the second bandwidth signal, the method further comprises: exciting alkali metal atoms in the first atomic cell and the second atomic cell from a ground state to a Rydberg initial state. The method further comprises:

2. The bandwidth extension method of claim 1, wherein, decomposing the original signal to obtain a plurality of decomposition signals, wherein the plurality of decomposition signals comprises a first decomposition signal and a second decomposition signal; mixing the first decomposition signal and a first mixing signal to obtain the first microwave signal, and mixing the second decomposition signal and a second mixing signal to obtain the second microwave signal. The method further comprises:

3. The bandwidth extension method according to claim 2, wherein, mixing the first microwave signal through the first atomic cell by using a first local oscillator microwave; and mixing the second microwave signal through the second atomic cell by using a second local oscillator microwave. The first microwave signal is smaller than the maximum transmissible bandwidth of an electromagnetically induced transparent signal generated in the first atomic cell; 4. The bandwidth extension method of claim 1, wherein, The second microwave signal is smaller than the maximum transmissible bandwidth of an electromagnetically induced transparent signal generated in the second atomic cell. The bandwidth expansion device is used to execute the bandwidth expansion method according to any one of claims 1-4, and the bandwidth expansion device comprises:

5. A bandwidth extension device based on Rydberg atoms, characterized in that a microwave signal generation unit configured to process a received original signal to obtain a plurality of microwave signals corresponding to the original signal, wherein the plurality of microwave signals comprises a first microwave signal and a second microwave signal; a first atomic cell configured to mix the first microwave signal to obtain a first bandwidth signal; a second atomic cell configured to mix the second microwave signal to obtain a second bandwidth signal; a bandwidth signal synthesis unit configured to synthesize the first bandwidth signal and the second bandwidth signal by using a frequency division multiplexing method to realize bandwidth expansion. The method further comprises:

6. The bandwidth extension apparatus of claim 5, wherein, ​ a first laser for exciting alkali metal atoms in the first or second atomic cell from a ground state to a first excited state; a second laser for exciting the alkali metal atoms in the first or second atomic cell from the first excited state to a Rydberg state.

7. The bandwidth extension apparatus of claim 6, wherein the first laser has a wavelength of 852 nm and the second laser has a wavelength of 509 nm.

8. The bandwidth extension apparatus of claim 7, wherein the alkali metal atoms are cesium atoms.

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