A multifunctional optical chip front-end structure

Abstract

The application discloses a multifunctional optical chip front-end structure and relates to the technical field of integrated photonic chips.The application comprises a data acquisition module, a mode analysis and parameter calculation module, a driving execution module, a verification feedback module and a local database, and each module cooperatively completes instruction acquisition, parameter calculation, optical path regulation and coherent verification, is based on a modularized and expandable symmetrical standardized optical path topology, is compatible with three types of working conditions, namely, a single-path input initial state preparation mode, a multi-path input straight transmission mode and a multi-photon entangled state preparation mode, automatically matches target beam splitter ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter, confirms that optical signals have completed transmission through the front-end structure, guarantees coherent stability of the multi-path optical signals, adapts to a multi-channel scene with single hardware, saves the frequency of chip replacement and manual calibration, and reduces the costs of chip production and debugging.

Description

Technical Field

[0001] This invention relates to the field of integrated photonic chip technology, and more specifically to a multifunctional optical chip front-end structure. Background Technology

[0002] As a core device in the fields of optical quantum computing, optical communication, and integrated optics, integrated optical chips have undergone a development process from single-function to multi-functional integration. Early optical chips were mainly oriented towards basic functions such as single beam splitting and beam combining in classical optical communication. With the rise of optical quantum computing technology, quantum optics experiments such as single-photon interference and multi-photon entanglement state preparation have placed higher demands on optical chips, prompting them to develop from single-function to complex optical path networks. In this process, the front-end structure of the optical chip, as the interface module connecting the external light source and the back-end main chip, has gradually undertaken multiple tasks such as optical path introduction, mode conversion, and initial state preparation. At the same time, the evolution of multi-channel coherent optical communication technology has also placed higher demands on the front-end structure in terms of parallel processing of multiple optical signals, driving the front-end structure of the optical chip to evolve towards multi-channel and high consistency.

[0003] Existing technologies, such as the invention patent applications related to quantum integrated photonic chip technology disclosed in announcement numbers CN112946968B and CN114815330B, have significant shortcomings upon comparison: Existing optical chip front-end optical paths are mostly single-function, only suitable for single scenarios such as initial-state beam splitting, direct photon transmission, or entanglement preparation. Switching between experimental conditions requires replacing the entire chip, and repeated fabrication increases R&D and production costs. Furthermore, frequent disassembly and alignment reduces experimental data consistency. Traditional beam splitting network topologies lack symmetry constraints, and different output channels... Significant differences exist in the number of beam splitters and the total length of waveguides, which can easily introduce uncontrollable phase shifts during optical transmission, greatly weakening the contrast of multi-path interference and the fidelity of quantum states. At the same time, most existing optical paths lack an integrated control system, making it impossible to automatically calculate the beam splitting ratio and phase parameters based on external commands. All of these rely on manual calibration and adjustment of adjustable beam splitters one by one, resulting in low efficiency in function switching. There is also no feedback mechanism for real-time acquisition of interference fringes to verify the coherence of the optical path, making it difficult to troubleshoot path mismatch issues caused by the manufacturing process. This makes it impossible to meet the actual usage requirements of multi-scenario compatibility, coherent stability, automatic adjustment, and general expansion. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the present invention aims to provide a multifunctional optical chip front-end structure.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a multifunctional optical chip front-end structure, including a data acquisition module: used to acquire functional mode instructions of the target application scenario in real time from an external control interface, and extract parameter information associated with each functional mode to construct a functional requirement dataset containing functional mode types and corresponding parameters.

[0006] The pattern parsing and parameter calculation module is used to parse and generate the target functional mode to be executed based on the functional requirement dataset. The target functional mode is input into the adjustable beam splitter parameter calculation model, and the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter corresponding to the target functional mode are output.

[0007] Drive execution module: Used to generate drive control signals for each adjustable beam splitter based on the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter, and adjust the beam splitting ratio configuration parameters and phase configuration parameters of each adjustable beam splitter accordingly.

[0008] Verification feedback module: used to determine the transmission of optical signals through the front structure after each adjustable beam splitter performs adjustment actions.

[0009] The beneficial effects of the present invention are as follows: (1) The first part of the present invention: the function control instructions issued by external devices are uniformly received through an independent data acquisition module, and various working condition-specific parameters are extracted synchronously and standardized encapsulation and storage are completed. It can adapt to three completely different business instruction formats: single initial state, multiple direct access, and entanglement preparation. There is no need for manual input and differentiation of various parameters. It can directly output a regular and unified functional requirement dataset to the subsequent calculation stage, avoid the problem of chaotic instruction parsing from the source, greatly shorten the preparation time before switching optical chip working conditions, and adapt to the high-efficiency operation requirements of multiple consecutive tests such as quantum experiments and coherent communication.

[0010] (2) The second part of the present invention: By binding the fixed topology of the front structure with the adjustable beam splitter parameter calculation model, the current operating conditions are automatically identified and the corresponding calculation strategy is matched according to the constructed functional requirement dataset. The beam splitting and phase parameters are automatically calculated in layers for different optical path levels. There is no need for staff to manually derive the optical path allocation values ​​according to the number of channels. At the same time, the adjustable beam splitter parameter calculation model can be modularly adapted to the channel scale. Different specifications of chips such as 8-channel and 12-channel share the same set of calculation logic, which greatly reduces the debugging threshold of multi-specification optical chips and improves the accuracy and consistency of optical path parameter configuration.

[0011] (3) The third part of the present invention: by adding an optical signal transmission confirmation link, after each adjustable beam splitter performs the adjustment action, it is confirmed that the optical signal has completed the transmission through the front structure, so as to ensure that the optical signal can be smoothly transmitted to the subsequent main chip structure. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the system modules of the present invention.

[0014] Figure 2 It is an 8-channel chip front-end structure.

[0015] Figure 3 It is a 12-channel chip front-end structure.

[0016] Figure 4 This is a diagram of the internal structure of an adjustable beam splitter. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figure 1 As shown, the present invention provides a multifunctional optical chip front-end structure, including a data acquisition module, a mode parsing and parameter calculation module, a driver execution module, a verification feedback module, and a local database.

[0019] It should be noted that the data acquisition module is connected to the pattern parsing and parameter calculation module, the pattern parsing and parameter calculation module is connected to the driver execution module, and the driver execution module is connected to the verification feedback module. The local database is connected to the data acquisition module, the pattern parsing and parameter calculation module, the driver execution module, and the verification feedback module.

[0020] The data acquisition module is used to acquire functional mode instructions for the target application scenario in real time from the external control interface, and at the same time extract parameter information associated with each functional mode to construct a functional requirement dataset containing functional mode types and corresponding parameters.

[0021] In a specific embodiment of the present invention, the method for constructing a functional requirement dataset containing functional mode types and corresponding parameters is as follows: obtaining functional mode instructions from an external control interface, extracting the functional mode types corresponding to the functional mode instructions, wherein the functional modes include single-input initial state preparation mode, multi-input direct transmission mode, and multi-photon entangled state preparation mode, extracting parameter information associated with the current functional mode according to the functional mode type, and associating and encapsulating the functional mode type with the extracted corresponding parameter information to construct a functional requirement dataset containing functional mode types and corresponding parameters.

[0022] It should be noted that when the functional mode type is single-input initial state preparation mode, the target light intensity distribution parameters are extracted; when the functional mode type is multi-input direct transmission mode, the identity matrix action parameters are extracted; and when the functional mode type is multi-photon entangled state preparation mode, the target entanglement path index parameters and beam splitting ratio parameters are extracted.

[0023] It should be noted that the target light intensity distribution parameter is the target light intensity distribution value on each output path, the identity matrix action parameter is the identification information used to indicate that the action of all adjustable beam splitters is set to the equivalent identity matrix, the target entanglement path index parameter is the index information used to determine the two target output paths for which entanglement needs to be prepared, and the beam splitting ratio parameter is the beam splitting ratio value used to indicate the adjustable beam splitter corresponding to the two target output paths.

[0024] The mode parsing and parameter calculation module is used to parse and generate the target functional mode to be executed based on the functional requirement dataset, input the target functional mode into the adjustable beam splitter parameter calculation model, and output the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter corresponding to the target functional mode.

[0025] In a specific embodiment of the present invention, the method for parsing and generating the target functional mode to be executed is as follows: extracting the functional mode type from the functional requirement dataset, taking the extracted functional mode type as the target functional mode to be executed, and outputting the target functional mode to be executed and its corresponding parameter information to the adjustable beam splitter parameter solution model.

[0026] It should be noted that since the functional requirements dataset itself is constructed based on the functional mode instructions sent from the external control interface, and the functional mode instructions already explicitly carry functional mode type information, the functional mode type extracted from the functional requirements dataset is the correct mode to be executed at present, and can be directly used as the target functional mode without additional judgment.

[0027] In a specific embodiment of the present invention, the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter corresponding to the target functional mode are specifically calculated as follows: when the target functional mode is a single-path input initial state preparation mode, the target beam splitting ratio configuration parameters of each adjustable beam splitter are calculated layer by layer according to the light intensity distribution relationship between each layer of the optical chip front-end structure based on the target light intensity distribution parameters, and the target phase configuration parameters of the adjustable beam splitters that do not participate in light intensity distribution are set as the corresponding values ​​of the equivalent identity matrix.

[0028] When the target function mode is multi-input direct transmission mode, the target beam splitting ratio configuration parameter of each adjustable beam splitter remains unchanged, and the target phase configuration parameter of all adjustable beam splitters is set to the corresponding value of the equivalent identity matrix.

[0029] When the target functional mode is the multiphoton entangled state preparation mode, two target output paths are determined according to the target entanglement path index parameters. The adjustable beam splitter that connects the two target output paths is taken as the target adjustable beam splitter. The target beam splitting ratio configuration parameter of the target adjustable beam splitter is set to the equalized beam splitting ratio. The target phase configuration parameter of the target adjustable beam splitter is set to the corresponding value required for entangled state preparation. The target phase configuration parameters of other adjustable beam splitters are set to the corresponding values ​​of the equivalent identity matrix.

[0030] In one specific embodiment, the target beam splitting ratio configuration parameters of each adjustable beam splitter are calculated layer by layer according to the light intensity distribution relationship between each layer of the optical chip front-end structure based on the target light intensity distribution parameters. The specific method is as follows: The target light intensity distribution parameters include the target light intensity distribution values ​​corresponding to each of the N output paths of the total number of channels. Each target light intensity distribution value is greater than 0 and the sum is 1. A single optical signal is input from one of the two middle input paths of the front-end structure. After the input light intensity is distributed by the adjustable beam splitter participating in the light intensity distribution in the first layer, two sets of light intensities are output. Each set of light intensities enters the corresponding adjustable beam splitter in the next layer. Each adjustable beam splitter determines the beam splitting ratio for the light intensity in its corresponding group according to the ratio of the sum of the light intensities of the corresponding subgroup in the next layer. In subsequent layers, each adjustable beam splitter participating in the light intensity distribution determines the beam splitting ratio based on the light intensity it receives and the ratio of the sum of the light intensities of its corresponding subgroup in the next layer. This process continues until the last layer, where each adjustable beam splitter determines the beam splitting ratio based on the ratio of its two corresponding target light intensity distribution values.

[0031] It should be noted that the target phase configuration parameters of all adjustable beam splitters are set to the corresponding values ​​of the equivalent identity matrix because each adjustable beam splitter consists of two multimode interference couplers and two adjustable phasers. The beam splitting ratio of each multimode interference coupler is a balanced beam splitting ratio. The phases of the two adjustable phasers of the adjustable beam splitter are set to specific values. These specific values ​​make the transmission matrix of the adjustable beam splitter an identity matrix, that is, the input optical signal maintains its original state and is directly output after passing through the adjustable beam splitter.

[0032] In one specific embodiment, two target output paths are determined based on the target entanglement path index parameters. The specific method is as follows: the target entanglement path index parameters include a first target path index value and a second target path index value. The output paths corresponding to the first target path index value and the second target path index value are located from the fixed topology network of the optical chip front-end structure, respectively. The two located output paths are determined as two target output paths. Based on the positions of the two target output paths in the optical chip front-end structure, all available transmission paths connecting the two target output paths are searched from the fixed topology network. The number of beam splitters traversed by each available transmission path is compared in ascending order of hierarchical span. The adjustable beam splitter on the transmission path with the fewest beam splitters is determined as the target adjustable beam splitter.

[0033] It should be noted that the beam splitting ratio configuration parameter of the target adjustable beam splitter is set to the equalized beam splitting ratio, which refers to the beam splitting ratio value for equalizing the two input optical signals. Its function is to cause the two single photons input from the input ports corresponding to the two target output paths to interfere at the target adjustable beam splitter, thereby generating an entangled state output. The target phase configuration parameter of the target adjustable beam splitter is set to the corresponding phase value required for the output of the two photons in an entangled state after the two input optical signals interfere through the target adjustable beam splitter. This corresponding phase value is a phase difference combination predetermined based on the interference principle, specifically determined by the phases of the two adjustable phasers. The values ​​are combined to form a two-photon entangled state, where the difference between the phase values ​​of the first and second adjustable phasers ensures that the two-photon output after the two input single photons pass through the target adjustable beamsplitter. The target phase configuration parameters of the other adjustable beamsplitters are set to the corresponding values ​​of the equivalent identity matrix. That is, all adjustable beams that do not participate in the entangled state preparation path are configured to transmit the optical signal directly without splitting it. This ensures that the two input single photons only interfere through the target adjustable beamsplitter on the shortest path, avoiding additional light intensity loss or phase change on non-target paths and ensuring the fidelity of entangled state preparation.

[0034] For example, single-input initial state preparation mode: taking the preparation of 8 initial states as an example, the target light intensity distribution parameters are { , , , , , , , The light intensity distribution values ​​of each target are all greater than 0 and their sum is 1. A single optical signal is input from the 4th path of the 8-channel front-end structure. Based on the target light intensity distribution parameters, the adjustable beam splitter in the first layer participates in the light intensity distribution. The beam splitting ratio is set to The two adjustable beam splitters in the second layer participate in light intensity distribution. and The beam splitting ratios are respectively set as and The four adjustable beam splitters in the third layer participate in light intensity distribution. , , , The beam splitting ratios are respectively set as , , , The target phase configuration parameters of each adjustable beam splitter not involved in intensity distribution are set to the corresponding values ​​of the equivalent identity matrix; the input intensity distribution is... , through the first layer After allocation, the light intensity distribution becomes After the second layer and After allocation, the light intensity distribution becomes After the third layer to After allocation, the output light intensity on paths 1 to 8 is respectively: to The initial state.

[0035] For example, in the multi-input direct transmission mode: taking 8 single photons input simultaneously from 8 channels as an example, each input path inputs one single photon, the beam splitting ratio configuration parameter of each adjustable beam splitter remains unchanged, and the target phase configuration parameter of all adjustable beam splitters is set to the corresponding value of the equivalent identity matrix. After each single photon passes through each layer of adjustable beam splitters, it maintains its original light intensity and phase state and is directly output to the subsequent main chip structure. That is, the single photon on the first input path is output from the first output path, the single photon on the second input path is output from the second output path, and so on. There is no light intensity redistribution between the paths.

[0036] For example, the multi-photon entangled state preparation mode: Taking the preparation of two-photon entangled states on the first and second paths as an example, the first target path index value in the target entangled path index parameter is 1, and the second target path index value is 2. The output paths corresponding to the first and second paths are located respectively from the fixed topology network of the pre-structure. All available transmission paths connecting the two output paths are searched. The adjustable beam splitter on the transmission path with the fewest beam splitters is determined as the target adjustable beam splitter. The beam splitting ratio configuration parameter of the target adjustable beam splitter is set to an equalized beam splitting ratio of 1:1. The phases of the two adjustable phasers of the target adjustable beamsplitter are set to π / 2 and 0 respectively, so that the two-photon output state after the two input single photons interfere with the target adjustable beamsplitter is a two-photon entangled state. The target phase configuration parameters of other adjustable beams through which the optical signal passes from the first and second paths on the left to the target adjustable beamsplitter are all set to the corresponding values ​​of the equivalent identity matrix. That is, these adjustable beamsplitters do not produce a beam splitting effect on the optical signal and directly transmit it. After the two input single photons interfere with the target adjustable beamsplitter, the output of the first and second paths on the right is a two-photon entangled state.

[0037] In a specific embodiment of the present invention, the method for constructing the adjustable beam splitter parameter calculation model is as follows: an adjustable beam splitter parameter calculation model is constructed based on a fixed topology network of the optical chip front-end structure. The adjustable beam splitter parameter calculation model is pre-set with parameter calculation strategies corresponding to the single-path input initial state preparation mode, the multi-path input direct transmission mode, and the multi-photon entangled state preparation mode, respectively.

[0038] Reference Figure 2 As shown, in a specific embodiment, the fixed topology network has the following structure: light is introduced from the left side in the optical chip front-end structure, the optical path is marked from top to bottom, the same column in the vertical direction constitutes one layer, and each square represents an adjustable beam splitter. The total number of layers in this structure is [number missing]. The last layer is made of Composed of an adjustable beam splitter and having Each layer has one input and one output channel, and each preceding layer consists of... Composed of an adjustable beam splitter and having Each layer has one input and output channel. Except for the last layer, the top and bottom adjustable beam splitters of each of the preceding layers are directly connected in series to the top and bottom channels, respectively. The last layer... The N inputs of an adjustable beam splitter and the penultimate layer The middle of an adjustable beam splitter The output terminals are connected in order from top to bottom, with the middle one of the second to last layer... An adjustable beam splitter The middle of the input terminal and the third-to-last layer An adjustable beam splitter The output terminals are interleaved, the last one... Top of the layer The input channel of the adjustable beam splitter and the penultimate one Top of the layer The output channels of the adjustable beam splitter are connected in sequence, starting from the last one... The bottom of the layer The input channel of the adjustable beam splitter and the penultimate one The bottom of the layer The output channels of the adjustable beam splitter are connected sequentially, starting from the middle of the xth layer from the end. An adjustable beam splitter The first input terminal and the last one The middle of the layer An adjustable beam splitter The output terminals are interleaved, among which When the total number of channels When it is an odd number, In this case, removing the bottom path of the corresponding structure will adapt it to odd-numbered path scenarios.

[0039] Reference Figure 3 As shown, it should be noted that the construction of the adjustable beam splitter parameter calculation model needs to be based on a fixed topology network of the optical chip front-end structure. The advantage of this is that it ensures that the calculated parameters correspond to the actual hardware connection relationship, avoiding optical path allocation errors or phase mismatch. When the total number of channels N changes, it is only necessary to adjust the network scale parameters according to the expansion law of the fixed topology to quickly adapt without redesigning the model. The parameter calculation strategies of the three functional modes are uniformly pre-set in the same model. By inputting the target functional mode and its corresponding parameters, the target configuration parameters of each adjustable beam splitter can be automatically output without manual calculation, which improves the efficiency of function switching and the consistency of parameter calculation.

[0040] It should be noted that the fixed topology network of the optical chip front-end structure is designed in the chip design stage by photolithography to design the length of each waveguide segment, so that the total waveguide length traversed by each path from any input on the left to any output on the right is equal. Combined with the design that the number of adjustable beam splitters traversed by each output path is consistent, the optical signal maintains the phase relationship and relative intensity between each coherent light after passing through this structure.

[0041] The drive execution module is used to generate drive control signals for each adjustable beam splitter based on the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter, and adjust the beam splitting ratio configuration parameters and phase configuration parameters of each adjustable beam splitter accordingly.

[0042] In a specific embodiment of the present invention, the method for generating the drive control signal for each adjustable beam splitter is as follows: for each adjustable beam splitter, the target phase difference between the two adjustable phasers is determined according to the target beam splitting ratio configuration parameter of the adjustable beam splitter, the common phase offset of the two adjustable phasers is determined according to the target phase configuration parameter of the adjustable beam splitter, and the target phase value of the two adjustable phasers is calculated according to the target phase difference and the common phase offset.

[0043] The target phase value of each adjustable phaser is converted into the corresponding voltage amplitude or current amplitude, and a drive control signal containing the voltage amplitude or current amplitude is generated.

[0044] It should be noted that for an adjustable beam splitter that needs to be set to an equivalent identity matrix, the phase difference between the two adjustable phasers is required for the beam splitter to achieve the splitting ratio corresponding to the identity matrix. The common phase offset is π, meaning that the target phase values ​​of both adjustable phasers are π / 2. For the tunable beamsplitter used as the target tunable beamsplitter in the multiphoton entangled state preparation mode, the phase difference between the two tunable phasers is... The common phase offset is That is, the target phase values ​​of the two adjustable phasers are respectively And 0.

[0045] In one specific embodiment, the target phase values ​​of the two adjustable phasers are calculated based on the target phase difference and the common phase offset, respectively. The specific method is as follows: the target phase difference represents the relative phase difference between the two adjustable phasers, the common phase offset represents the average phase reference of the two adjustable phasers, the common phase offset plus half of the target phase difference is used as the target phase value of the first adjustable phaser, and the common phase offset minus half of the target phase difference is used as the target phase value of the second adjustable phaser.

[0046] In a specific embodiment of the present invention, the method for adjusting the beam splitting ratio configuration parameters and phase configuration parameters of each adjustable beam splitter is as follows: the drive control signal of each adjustable beam splitter is applied to the drive input terminal of the corresponding adjustable beam splitter, and the two adjustable phase transformers inside each adjustable beam splitter adjust the phase according to the target phase value in the received drive control signal, thereby adjusting the actual beam splitting ratio and actual phase of each adjustable beam splitter to the target beam splitting ratio configuration parameters and target phase configuration parameters.

[0047] Reference Figure 4As shown, the adjustable beam splitter consists of two multimode interference couplers and two adjustable phasers. The phase difference between the two adjustable phasers determines the beam splitting ratio of the adjustable beam splitter, and the common phase offset of the two adjustable phasers determines the overall phase response of the adjustable beam splitter. Therefore, by adjusting the phase values ​​of the two adjustable phasers, the beam splitting ratio configuration parameter and the phase configuration parameter can be adjusted simultaneously.

[0048] For example, taking the adjustable beam splitter as an equivalent identity matrix, the target phase value corresponding to each of the two adjustable phasers of the adjustable beam splitter is... After the drive control signal is applied to the drive input of the adjustable beam splitter, the actual phases of both adjustable phasers are adjusted to... At this time, the phase difference between the two adjustable phasers is 0. The adjustable beam splitter does not split the input optical signal but transmits it directly. That is, the actual beam splitting ratio of the adjustable beam splitter is adjusted to the beam splitting ratio corresponding to the unit matrix, and the actual phase is adjusted to the phase state corresponding to the unit matrix.

[0049] For example, taking the tunable beamsplitter used as the target tunable beamsplitter in the multiphoton entangled state preparation mode as an example, the target phase values ​​corresponding to the two tunable phasers of the target tunable beamsplitter are respectively After the drive control signal is applied to the drive input of the adjustable beam splitter, the actual phase of the first adjustable phaser is adjusted to 0. The actual phase of the second adjustable phaser is adjusted to 0, at which point the phase difference between the two adjustable phasers is 0. The adjustable beam splitter performs equal beam splitting on two input optical signals, and the two input single photons are output as an entangled state after interference by the adjustable beam splitter.

[0050] The verification feedback module is used to determine the transmission of the optical signal through the front structure after each adjustable beam splitter performs an adjustment action.

[0051] In a specific embodiment of the present invention, the method for determining the transmission of the optical signal through the front-end structure is as follows: after each adjustable beam splitter performs an adjustment action, the optical signal of each output path is acquired, and when there is an optical signal in each output path, it is confirmed that the optical signal has been transmitted through the front-end structure.

[0052] It should be noted that the optical chip front-end structure includes N input paths and N output paths. The optical signal is introduced from each input path of the front-end structure, passes through each layer of adjustable beam splitter in sequence, and is split and phase modulated by each layer of adjustable beam splitter according to its adjusted splitting ratio configuration parameters and phase configuration parameters. The signal is then output from each output path of the front-end structure. Therefore, each output path is the exit point of the optical signal after passing through the front-end structure, and the optical signal can be directly obtained from each output path.

[0053] The examples described in this invention are not limited to the specific embodiments listed above. The examples are merely illustrative to facilitate understanding of the invention and do not constitute a limitation on the scope of protection of this invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this invention should be included within the scope of protection.

[0054] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in this specification, they should all fall within the protection scope of the present invention.

Claims

1. A multifunctional optical chip front-end structure, characterized in that, Includes the following modules: Data acquisition module: used to acquire functional mode instructions of the target application scenario in real time from the external control interface, and extract parameter information associated with each functional mode to construct a functional requirement dataset containing functional mode types and corresponding parameters. The pattern parsing and parameter calculation module is used to parse and generate the target functional pattern to be executed based on the functional requirement dataset, input the target functional pattern into the adjustable beam splitter parameter calculation model, and output the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter corresponding to the target functional pattern. Drive execution module: Used to generate drive control signals for each adjustable beam splitter based on the target beam splitting ratio configuration parameters and target phase configuration parameters of each adjustable beam splitter, and adjust the beam splitting ratio configuration parameters and phase configuration parameters of each adjustable beam splitter accordingly; Verification feedback module: used to determine the transmission of optical signals through the front structure after each adjustable beam splitter performs adjustment actions.

2. The multifunctional optical chip front-end structure according to claim 1, characterized in that, The specific method for constructing the functional requirement dataset containing functional mode types and corresponding parameters is as follows: The system obtains functional mode instructions from an external control interface, extracts the functional mode types corresponding to the functional mode instructions, and the functional modes include single-input initial state preparation mode, multi-input direct transmission mode, and multi-photon entangled state preparation mode. Based on the functional mode type, it extracts parameter information associated with the current functional mode, and associates and encapsulates the functional mode type with the extracted corresponding parameter information to construct a functional requirement dataset containing functional mode types and corresponding parameters.

3. The multifunctional optical chip front-end structure according to claim 2, characterized in that, The specific method for parsing and generating the target functional mode to be executed is as follows: Extract functional pattern types from the functional requirements dataset, use the extracted functional pattern types as the target functional patterns to be executed, and output the target functional patterns to be executed and their corresponding parameter information to the adjustable beam splitter parameter solution model.

4. The multifunctional optical chip front-end structure according to claim 3, characterized in that, The specific method for configuring the target beam splitting ratio and target phase of each adjustable beam splitter corresponding to the target functional mode is as follows: When the target functional mode is the single-input initial state preparation mode, the target beam splitting ratio configuration parameters of each adjustable beam splitter are calculated layer by layer according to the light intensity distribution relationship between each layer of the optical chip front structure based on the target light intensity distribution parameters. The target phase configuration parameters of the adjustable beam splitter that does not participate in the light intensity distribution are set to the corresponding values ​​of the equivalent unit matrix. When the target function mode is multi-input direct transmission mode, the target beam splitting ratio configuration parameter of each adjustable beam splitter remains unchanged, and the target phase configuration parameter of all adjustable beam splitters is set to the corresponding value of the equivalent identity matrix. When the target functional mode is the multiphoton entangled state preparation mode, two target output paths are determined according to the target entanglement path index parameters. The adjustable beam splitter that connects the two target output paths is taken as the target adjustable beam splitter. The target beam splitting ratio configuration parameter of the target adjustable beam splitter is set to the equalized beam splitting ratio. The target phase configuration parameter of the target adjustable beam splitter is set to the corresponding value required for entangled state preparation. The target phase configuration parameters of other adjustable beam splitters are set to the corresponding values ​​of the equivalent identity matrix.

5. The multifunctional optical chip front-end structure according to claim 4, characterized in that, The specific method for constructing the adjustable beam splitter parameter calculation model is as follows: An adjustable beam splitter parameter calculation model is constructed based on a fixed topology network with a front-end structure of an optical chip. The adjustable beam splitter parameter calculation model has preset parameter calculation strategies corresponding to single-input initial state preparation mode, multi-input direct transmission mode and multi-photon entangled state preparation mode.

6. A multifunctional optical chip front-end structure according to claim 4, characterized in that, The specific method for generating the drive control signals for each adjustable beam splitter is as follows: For each adjustable beam splitter, the target phase difference between the two adjustable phasers is determined according to the target beam splitter's target beam splitting ratio configuration parameter. The common phase offset of the two adjustable phasers is determined according to the target phase configuration parameter of the adjustable beam splitter. The target phase value of each of the two adjustable phasers is calculated according to the target phase difference and the common phase offset. The target phase value of each adjustable phaser is converted into the corresponding voltage amplitude or current amplitude, and a drive control signal containing the voltage amplitude or current amplitude is generated.

7. A multifunctional optical chip front-end structure according to claim 6, characterized in that, The specific method for adjusting the beam splitting ratio configuration parameters and phase configuration parameters of each adjustable beam splitter is as follows: The drive control signal of each adjustable beam splitter is applied to the drive input terminal of the corresponding adjustable beam splitter. The two adjustable phasers inside each adjustable beam splitter adjust the phase according to the target phase value in the received drive control signal, thereby adjusting the actual beam splitting ratio and actual phase of each adjustable beam splitter to the target beam splitting ratio configuration parameter and target phase configuration parameter.

8. A multifunctional optical chip front-end structure according to claim 7, characterized in that, The specific method for determining the transmission of the optical signal through the pre-emitter structure is as follows: After each adjustable beam splitter performs its adjustment action, the optical signal of each output path is acquired. When there is an optical signal in each output path, it is confirmed that the optical signal has been transmitted through the front-end structure.

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