Optical quantum computing oriented fiber laser device and working method

Abstract

This invention relates to the fields of ultrafast lasers and quantum mechanics, and provides a fiber laser device and its operating method for quantum computing. The fiber laser device includes: a resonant cavity unit for generating mode-locked ultrashort pulses; a pre-amplification unit for nonlinearly broadening and amplifying the mode-locked ultrashort pulses; a first distributed dispersion management unit for dispersion modulation and time-domain broadening of the self-similar pulses output from the pre-amplification unit, and for storing chirp; a power amplification unit for power amplification of the broadened pulses output from the first distributed dispersion management unit; a second distributed dispersion management unit for dispersion modulation, pulse compression, and tuning of the broadened pulses output from the power amplification unit; and a frequency conversion unit for performing various nonlinear transformations on the femtosecond-level chirp-free pulses output from the second distributed dispersion management unit to obtain pulse outputs with different center wavelengths for use in quantum computing. It features low chirp, high power, and tunable frequency.

Description

Technical Field

[0001] This invention relates to the fields of ultrafast lasers and quantum mechanics, and more particularly to a fiber laser device and its operating method for quantum computing. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Ultrafast fiber lasers, with their low cost, compact size, and excellent anti-interference capabilities, are applied in the field of quantum computing, providing a stable and coherent light source and a reliable foundation for the operation and transmission of qubits. Ultrafast fiber lasers are used for qubit initialization; by adjusting the laser frequency and energy, the qubit transitions from its ground state to a target state, thus initializing the qubit. Ultrafast fiber lasers can also be used for coupling and transmission between qubits; by adjusting the laser wavelength and power, mutual coupling between qubits can be achieved. Simultaneously, ultrafast fiber lasers possess excellent beam quality, ensuring the transmission quality between qubits and reducing errors in information transmission.

[0004] However, current ultrafast fiber lasers face several challenges compared to traditional solid-state lasers when applied to optical quantum computing. First, using fiber as the gain and transmission medium inevitably leads to more significant dispersion issues (especially higher-order dispersion), resulting in pulse broadening and distortion. This, in turn, reduces laser power density and coherence, failing to meet the high requirements of optical quantum computing. Second, constrained by the small size of optical fibers, the output power of current ultrafast lasers (average power above 200mW) still falls short of practical needs.

[0005] In summary, there are currently no dedicated ultrafast light source products on the market that are fully designed for optical quantum computing. Existing products also have significant gaps in core parameters such as chirp management, power level, and wavelength tuning compared to the requirements of optical quantum computing. Summary of the Invention

[0006] To address the technical problems existing in the background art, the present invention provides a fiber laser device and its operating method for optical quantum computing. The fiber laser device has low chirp, high power and tunable frequency, which will promote the cost reduction and high integration of optical quantum computing, and further promote the rapid development of optical quantum computing research and industrialization.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides a fiber laser device for optical quantum computing.

[0009] A fiber laser device for optical quantum computing includes: an integrated control unit and a resonant cavity unit, a pre-amplification unit, a power amplification unit and a frequency conversion unit respectively connected thereto;

[0010] The resonant cavity unit is used to generate mode-locked ultrashort pulses;

[0011] The pre-amplification unit is used to nonlinearly broaden and amplify mode-locked ultrashort pulses;

[0012] The first distributed dispersion management unit is used to perform dispersion control and time-domain broadening on the self-similar pulses output by the pre-amplification unit, and to store chirps.

[0013] The power amplification unit is used to amplify the power of the broadened pulse output by the first distributed dispersion management unit;

[0014] The second distributed dispersion management unit is used to perform dispersion control, pulse compression, and tuning on the broadened pulse output by the power amplifier unit;

[0015] The frequency conversion unit is used to perform various nonlinear transformations on the chirp-free pulses at the femtosecond level output by the second distributed dispersion management unit to obtain pulse outputs with different center wavelengths for use in optical quantum computing.

[0016] Furthermore, the resonant cavity unit includes an adjustable fiber attenuator, a fiber dispersion compensator, and a wavelength division multiplexer. The adjustable fiber attenuator is used to adjust and control the intracavity loss, the fiber dispersion compensator is used to adjust and control the intracavity dispersion, and the wavelength division multiplexer is used to adjust and control the intracavity gain.

[0017] Furthermore, the integrated control unit has a built-in miniature spectrometer for detecting the spectrum of the mode-locked ultrashort pulses output by the resonant cavity unit. Based on the detected power and spectrum, it controls the adjustable fiber attenuator, fiber dispersion compensator, and wavelength division multiplexer until the mode-locked pulses output by the resonant cavity unit meet the set requirements in terms of both power and spectrum.

[0018] Furthermore, the integrated control unit also has a built-in power detector for detecting the power of the mode-locked ultrashort pulse output by the resonant cavity unit.

[0019] Furthermore, the pre-amplification unit includes a section of normal dispersion gain fiber, a section of anomalous dispersion fiber, and a first pump source.

[0020] Furthermore, after confirming that the output power and spectrum of the resonant cavity unit meet the set requirements for mode-locked ultrashort pulses, the integrated control unit activates the anti-large-stage pump and uses a micro spectrometer to detect in real time whether the mode-locked ultrashort pulses output by the pre-amplification unit have completed self-similar evolution. If so, the pre-amplification unit outputs self-similar pulses; otherwise, the pump current is adjusted by controlling the first pump source, and the dispersion is adjusted by controlling the fiber dispersion compensator.

[0021] Furthermore, the power amplification unit includes an anomalous dispersion gain fiber, a polarization-maintaining fiber, and a second pump source.

[0022] Furthermore, after confirming that the pre-amplification unit outputs a self-similar pulse, the integrated control unit turns on the main amplification stage pump, adjusts the pump current by controlling the second pump source, adjusts the dispersion by controlling the fiber dispersion compensator, and suppresses nonlinear pulses until the power amplification unit outputs a broadened pulse that meets the set requirements.

[0023] Furthermore, the frequency conversion unit includes a variety of replaceable nonlinear crystal modules and temperature control devices.

[0024] A second aspect of the present invention provides a method for operating a fiber laser device for optical quantum computing.

[0025] A method for operating a fiber laser device for optical quantum computing includes:

[0026] Mode-locked ultrashort pulses are generated using resonant cavity units;

[0027] A pre-amplification unit is used to nonlinearly broaden and amplify mode-locked ultrashort pulses;

[0028] The first distributed dispersion management unit is used to perform dispersion management and time-domain broadening on the self-similar pulses output by the pre-amplification unit, and to store the chirp.

[0029] A power amplification unit is used to amplify the power of the broadened pulse output from the first distributed dispersion management unit;

[0030] A second distributed dispersion management unit is used to perform dispersion management, pulse compression, and tuning on the broadened pulse output from the power amplifier unit;

[0031] The frequency conversion unit performs various nonlinear transformations on the chirp-free pulses at the femtosecond level output by the second distributed dispersion management unit to obtain pulse outputs with different center wavelengths for use in optical quantum computing.

[0032] An integrated control unit is used to control the processing of the resonant cavity unit, pre-amplification unit, power amplification unit, and frequency conversion unit.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] This invention proposes a fiber laser device and its operating method for optical quantum computing, bridging the gap between existing products and the requirements of optical quantum computing in key parameters such as chirp management, power level, and wavelength tuning, and providing a feasible solution. Through the implementation of this solution, leveraging the advantages of fiber ultrafast lasers in terms of compactness, integrability, economy, and reliability, an alternative light source option is provided for optical quantum computing applications. This is expected to help optical quantum computing research gradually reduce its dependence on imported solid-state ultrafast lasers and promote the industrialization of optical quantum computing.

[0035] This invention proposes for the first time an ultrafast fiber laser scheme with a multi-stage structure. Based on a hybrid amplification mechanism including intracavity modulation, global distributed dispersion management and matching, self-similar amplification and chirped pre-amplification, soliton self-frequency shift, and nonlinear frequency conversion, it obtains femtosecond pulse output with near Fourier transform limit, large power and certain frequency tuning capability, which meets the special requirements of optical quantum computing for ultrafast light sources. Attached Figure Description

[0036] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0037] Figure 1 This is a structural diagram of a fiber laser device for optical quantum computing as shown in this invention;

[0038] Among them, 1. Resonant cavity unit, 11. Programmable adjustable fiber optic attenuator, 12. Fiber optic dispersion compensator, 13. Wavelength division multiplexer, 2. Pre-amplification unit, 31. First distributed dispersion management unit, 32. Second distributed dispersion management unit, 4. Power amplification unit, 5. Frequency conversion unit, 6. Integrated control unit. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] like Figure 1As shown, this embodiment provides a fiber laser device for optical quantum computing, including: a resonant cavity unit 1, a pre-amplification unit 2, a first distributed dispersion management unit 31, a second distributed dispersion management unit 32, a power amplification unit 4, a frequency conversion unit 5, and an integrated control unit 6. The resonant cavity unit 1 is connected to the pre-amplification unit 2, the pre-amplification unit 2 is connected to the first distributed dispersion management unit 31, the first distributed dispersion management unit 31 is connected to the power amplification unit 4, the power amplification unit 4 is connected to the second distributed dispersion management unit 32, and the second distributed dispersion management unit 32 is connected to the frequency conversion unit 5. The resonant cavity unit 1, the pre-amplification unit 2, the power amplification unit 4, and the frequency conversion unit 5 are all connected to the integrated control unit 6.

[0042] Specifically, the resonant cavity unit 1 includes multiple polarization-maintaining fiber devices, including a programmable adjustable fiber attenuator 11, a fiber dispersion compensator 12, and a wavelength division multiplexer 13, used for generating mode-locked ultrashort pulses and serving as the seed light source for the entire scheme. The resonant cavity unit 1 adopts a typical ring cavity structure and is based on semiconductor saturable absorber mirrors (SESAM) mode-locked operation (but not limited to SESAM mode-locking). Due to the use of fiber devices with different dispersion signs, the resonant cavity unit will operate in either breathing soliton mode-locking or conventional soliton mode-locking states.

[0043] The pre-amplification unit 2 includes a relatively long normal dispersion gain fiber, a precisely proportioned anomalous dispersion fiber, a pump source, and a coupling element (WDM). The pump signal emitted by the pump source is coupled through the WDM, and the pump light from the WDM is then coupled through the anomalous dispersion fiber into the normal dispersion gain fiber. The pre-amplification unit 2 nonlinearly broadens and amplifies the seed pulse light, preparing it for subsequent amplification and pulse conditioning. The pre-amplification unit 2 constructs an erbium-doped fiber amplifier (EDFA) structure that achieves self-similar amplification. Using a forward pumping method, 980nm light is pumped through the WDM into the normal dispersion gain fiber, thereby amplifying the seed pulse input to the resonant cavity.

[0044] The first distributed dispersion management unit 31 and the second distributed dispersion management unit 32 are used for precise dispersion management and allocation to avoid the generation of undesired nonlinearity and higher-order dispersion. Dispersion management by the first distributed dispersion management unit 31 and the second distributed dispersion management unit 32 is achieved by combining a dispersion-compensating fiber (DCF) or a chirped fiber Bragg grating (CFBG) with fiber pigtails fused to it in the 1560nm band to form a complete structure. Different dispersion compensation amounts can be configured by adjusting the length of the fusion splice or selecting the total dispersion compensation amount of the devices. Specifically, by changing the length of the second distributed dispersion management unit 32 (for the DCF) or the reflection wavelength (CFBG), the nonlinear accumulation of transmitted ultrashort pulse light can be controlled. The center wavelength can be shifted using the soliton self-frequency shift (SSFS) principle, or the center wavelength can be tuned directly by changing the reflection wavelength.

[0045] Power amplification unit 4 includes: a short section of anomalous dispersion gain fiber, a precisely proportioned polarization-maintaining fiber, a pump source, and a coupling element (WDM). The pump signal emitted by the pump source is coupled through the WDM, and the pump light passing through the WDM is coupled into the polarization-maintaining fiber via the anomalous dispersion gain fiber. Power amplification unit 4 amplifies the power of the ultrashort pulse light with low nonlinearity. Power amplification unit 4 is based on the pre-chirped amplification (CPA) principle, using different dispersive devices to achieve pulse pre-broadening, amplification, and compression. Similar to the pre-amplification unit, it is also a special erbium-doped fiber amplifier (considering the configuration combination of different dispersive devices), but it uses a backward or bidirectional pumping method to pump 980nm light into the anomalous dispersion gain fiber via the WDM, thereby achieving significant power amplification of the input light.

[0046] The frequency conversion unit 5 includes a nonlinear crystal (PPLN, BBO, PPKTP, etc.) and a temperature control module, used for frequency conversion of ultrashort pulse light to expand the wavelength coverage. The frequency conversion unit 5 generally also includes a collimator, a beam expander lens group, a focusing lens, a collimated output lens, and structural components. The ultrashort pulse light output from the pre-amplifier is expanded, collimated, and focused before entering the nonlinear crystal. Frequency conversion can be achieved through nonlinear processes such as second harmonic generation (SHG), sum-frequency generation (SFG), and difference-frequency generation (DFG) to obtain laser output in other wavelength bands.

[0047] The integrated control unit 6 includes hardware circuitry and control logic, used for the integrated management and control of the entire system to achieve stable output. The integrated control unit 6 typically comprises a logic and control on-chip processor combination consisting of an FPGA and an ARM chip, which acquires and manages data from other units. A simplified control logic is as follows: Real-time acquisition of the final output laser parameters (including pulse width, spectrum, and power). Provided the output power meets requirements, the pulse width and spectral parameters are input to the FPGA's built-in DSP unit for processing. (The DSP unit's built-in algorithm calculates the product of the spectral width and pulse width (time-bandwidth product) and compares it with the Fourier transform limit. If the calculated value is within the set range, no further adjustment is needed; if it exceeds the range, feedback adjustment reference parameters guide the adjustment of system parameters until the parameter requirements are met.) The specific control process is described below.

[0048] The fiber laser device of the present invention operates as follows:

[0049] Under the management of the integrated control unit, the resonant cavity unit 1 achieves precise adjustment of intracavity loss, dispersion, and gain through multiple core components: a programmable adjustable fiber optic attenuator 11, a fiber optic dispersion compensator 12, and a wavelength division multiplexer 13. The adjustable fiber optic attenuator 11 is connected to the fiber optic dispersion compensator 12, and the fiber optic dispersion compensator 12 is connected to the wavelength division multiplexer 13. This allows for the acquisition of various stable target soliton morphology pulse outputs, depending on the net dispersion value within the cavity. Simultaneously, through precise control of multiple core parameters, mode-locked center wavelength tuning can be performed under multiple mechanisms including gain saturation, reabsorption, and saturable absorption, thereby obtaining mode-locked pulse outputs with different center wavelengths.

[0050] The optical pulse with a certain center wavelength and soliton morphology output from resonant cavity unit 1 first enters pre-amplification unit 2 for amplification. The optical pulse transmitted in the normal dispersive fiber contained in pre-amplification unit 2 will undergo self-similar evolution, achieving significant spectral broadening while realizing linear accumulation of chirp and gain, which lays the foundation for subsequent pulse compression and power amplification.

[0051] After being amplified by the pre-amplification unit 2, the pulse further enters the first distributed dispersion management unit 31. In the first distributed dispersion management unit 31, the pulse will gain a further significant time-domain broadening and store a large amount of chirp to prepare for subsequent power amplification.

[0052] The broadened pulse from the first distributed dispersion management unit 31 continues into the power amplification unit 4. The power amplification unit 4 contains a short, highly doped fiber and a programmable bidirectional pump module. The broadened pulse will be significantly amplified in the short gain fiber based on a precisely managed programmable pump (centrally controlled by the integrated control unit 6), while also amplifying the low level of its accompanying noise.

[0053] After amplification by power amplification unit 4, the pulse is in a broadened state with negative chirp, typically on the order of picoseconds. The broadened pulse continues to propagate into the second distributed dispersion management unit 32, where it is compressed under the normal dispersion provided by the second distributed dispersion management unit 32, resulting in a chirp-free pulse output at the level of hundreds of femtoseconds. Based on soliton propagation theory, ultrashort pulses propagating in fiber waveguides will undergo a slow redshift, i.e., soliton self-frequency shift (SSA), which is mainly attributed to the in-band Raman dispersion of the pulse. Therefore, in addition to dispersion management and pulse compression, the second distributed dispersion management unit 32 can also tune the pulse center wavelength.

[0054] The pulses compressed by the second distributed dispersion management unit 32 continue to enter the frequency conversion unit 5. The frequency conversion unit 5 contains various replaceable nonlinear crystal modules and temperature control devices, capable of performing various nonlinear transformations on the femtosecond pulses, including frequency doubling, sum-frequency conversion, difference-frequency conversion, and parametric conversion, to obtain pulse outputs with different center wavelengths, ultimately applied to optical quantum computing. The temperature control devices provide a specific temperature environment for the nonlinear processes occurring in the nonlinear crystal modules.

[0055] To further explain, the fiber laser device described in this invention is uniformly coordinated under the control logic and algorithm of the integrated control unit 6. From the output of pulses with flexible soliton morphology to multi-stage amplification, under the precise control of distributed dispersion, it obtains linear chirp, spectral broadening, nonlinear utilization and suppression, pulse compression, power amplification and frequency conversion of the pulse, and finally obtains ultrashort pulse output with wide time domain, near-zero chirp and large power.

[0056] In some embodiments, the control logic of the integrated control unit 6 is as follows:

[0057] (1) The integrated control unit 6 acquires the real-time output parameters of the resonant cavity through a power detector, a temperature sensor, and a miniature spectrometer built into the resonant cavity. It then modulates the cavity loss, dispersion, and gain through a programmable adjustable fiber optic attenuator 11, a fiber optic dispersion compensator 12, and a wavelength division multiplexer 13 located in the resonant cavity, respectively. These modulates form a closed-loop control circuit with the real-time output parameters until a mode-locked pulse output that satisfies the spectral and power characteristics is obtained. The temperature sensor is used to detect the temperature inside the resonant cavity, serving as an input parameter for controlling the cavity state.

[0058] (2) After confirming that the mode-locked pulse output of the resonant cavity meets the requirements, the integrated control unit 6 turns on the pre-amplification stage pump and monitors in real time whether the output spectrum has completed the self-similar evolution through the built-in micro spectrometer. It forms a closed-loop control circuit by finely controlling the pump current of the pump source in the pre-amplification unit 2 and the power amplification unit 4 and the dispersion in the pre-resonant cavity until the final self-similar pulse is output.

[0059] (3) After confirming that the pre-amplification stage has obtained a self-similar soliton pulse output, the integrated control unit 6 turns on the main amplification stage pump. In the same way as the pre-amplification stage control method, a closed-loop control circuit is formed by fine control of the pump current and the dispersion of the pre-dispersion compensation unit, so as to finally realize the power amplification and strictly suppress the nonlinearity.

[0060] (4) The integrated control unit 6 and multiple sensing devices (temperature sensor, etc.) built into the laser optical path

[0061] Multiple control loops are formed by multispectral sensors, power sensors, etc., and control modules to achieve fine adjustment of multiple parameters and ultimately control of the entire machine. The multiple control loops are independent of each other, but interconnected. By collecting and recording operation and control data, a mapping relationship between the two is established, and mature machine learning algorithms are used to optimize and iterate to obtain the best control logic, which is then applied to the real-time control process.

[0062] In some embodiments, the first distributed dispersion management unit 31 and the second distributed dispersion management unit 32 further include dispersion devices of each module of the scheme, which together constitute a complete distributed dispersion management structure, making dispersion management more precise.

[0063] The innovation of this invention lies first in addressing the need for ultrafast light sources in optical quantum computing. It proposes for the first time an ultrafast fiber laser scheme with a multi-level structure. Based on a hybrid amplification mechanism including intracavity control, global distributed dispersion management and matching, self-similar amplification and chirped pre-amplification, soliton self-frequency shift, and nonlinear frequency conversion, it obtains femtosecond pulse output with near Fourier transform limit, high power and certain frequency tuning capability, thus meeting the special requirements of optical quantum computing for ultrafast light sources.

[0064] The innovation of this invention also lies in the first-time proposal and detailed description of a complete scheme and working logic for ultrafast lasers dedicated to optical quantum computing based on optical fiber media. This provides an alternative light source for optical quantum computing applications and has potential advantages over traditional solid-state lasers in terms of compactness, integrability, economy, and reliability.

[0065] Example 2

[0066] This embodiment provides a method for operating a fiber laser device for optical quantum computing, including:

[0067] A method for operating a fiber laser device for optical quantum computing includes:

[0068] Mode-locked ultrashort pulses are generated using resonant cavity units;

[0069] A pre-amplification unit is used to nonlinearly broaden and amplify mode-locked ultrashort pulses;

[0070] The first distributed dispersion management unit is used to perform dispersion management and time-domain broadening on the self-similar pulses output by the pre-amplification unit, and to store the chirp.

[0071] A power amplification unit is used to amplify the power of the broadened pulse output from the first distributed dispersion management unit;

[0072] A second distributed dispersion management unit is used to perform dispersion management, pulse compression, and tuning on the broadened pulse output from the power amplifier unit;

[0073] The frequency conversion unit performs various nonlinear transformations on the chirp-free pulses at the femtosecond level output by the second distributed dispersion management unit to obtain pulse outputs with different center wavelengths for use in optical quantum computing.

[0074] An integrated control unit is used to control the processing of the resonant cavity unit, pre-amplification unit, power amplification unit, and frequency conversion unit.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fiber laser device for optical quantum computing, characterized in that, include: The integrated control unit and its respective connected resonant cavity unit, pre-amplification unit, power amplification unit, and frequency conversion unit; The resonant cavity unit is used to generate mode-locked ultrashort pulses; The pre-amplification unit is used to nonlinearly broaden and amplify mode-locked ultrashort pulses; The first distributed dispersion management unit is used to perform dispersion control and time-domain broadening on the self-similar pulses output by the pre-amplification unit, and to store chirps. The power amplification unit is used to amplify the power of the broadened pulse output by the first distributed dispersion management unit; The second distributed dispersion management unit is used to perform dispersion control, pulse compression, and tuning on the broadened pulse output by the power amplifier unit; The frequency conversion unit is used to perform various nonlinear transformations on the chirp-free pulses at the femtosecond level output by the second distributed dispersion management unit to obtain pulse outputs with different center wavelengths for use in optical quantum computing. The first and second distributed dispersion management units are composed of dispersion-compensating optical fibers with normal dispersion or chirped fiber Bragg gratings combined with fiber pigtails fused to them to achieve a complete structure. The integrated control unit has a built-in miniature spectrometer for detecting the spectrum of the mode-locked ultrashort pulses output by the resonant cavity unit, and also has a built-in power detector for detecting the power of the mode-locked ultrashort pulses output by the resonant cavity unit. The integrated control unit controls the processing of the resonant cavity unit, the pre-amplification unit, the power amplification unit, and the frequency conversion unit.

2. The fiber laser device for optical quantum computing according to claim 1, characterized in that, The resonant cavity unit includes an adjustable fiber attenuator, a fiber dispersion compensator, and a wavelength division multiplexer. The adjustable fiber attenuator is used to adjust and control the intracavity loss, the fiber dispersion compensator is used to adjust and control the intracavity dispersion, and the wavelength division multiplexer is used to adjust and control the intracavity gain.

3. The fiber laser device for optical quantum computing according to claim 2, characterized in that, The integrated control unit controls the adjustable fiber attenuator, fiber dispersion compensator, and wavelength division multiplexer based on the detected power and spectrum until the mode-locked pulses output by the resonant cavity unit meet the set requirements for both power and spectrum.

4. The fiber laser device for optical quantum computing according to claim 1, characterized in that, The pre-amplification unit includes a section of normal dispersion gain fiber, a section of anomalous dispersion fiber, and a first pump source.

5. The fiber laser device for optical quantum computing according to claim 4, characterized in that, After confirming that the output power and spectrum of the resonant cavity unit meet the set requirements for mode-locked ultrashort pulses, the integrated control unit starts the pre-amplification stage pump and uses a micro spectrometer to detect in real time whether the mode-locked ultrashort pulses output by the pre-amplification unit have completed self-similar evolution. If so, the pre-amplification unit outputs self-similar pulses; otherwise, the pump current is adjusted by controlling the first pump source, and the dispersion is adjusted by controlling the fiber dispersion compensator.

6. The fiber laser device for optical quantum computing according to claim 2, characterized in that, The power amplification unit includes an anomalous dispersion gain fiber, a polarization-maintaining fiber, and a second pump source.

7. The fiber laser device for optical quantum computing according to claim 6, characterized in that, After confirming that the pre-amplification unit outputs a self-similar pulse, the integrated control unit turns on the main amplification stage pump, adjusts the pump current by controlling the second pump source, adjusts the dispersion by controlling the fiber dispersion compensator, and suppresses nonlinear pulses until the power amplification unit outputs a broadened pulse that meets the set requirements.

8. The fiber laser device for optical quantum computing according to claim 1, characterized in that, The frequency conversion unit includes a variety of replaceable nonlinear crystal modules and temperature control devices.

9. A method for operating a fiber laser device for optical quantum computing as described in any one of claims 1-8, characterized in that, include: Mode-locked ultrashort pulses are generated using resonant cavity units; A pre-amplification unit is used to nonlinearly broaden and amplify mode-locked ultrashort pulses; The first distributed dispersion management unit is used to perform dispersion management and time-domain broadening on the self-similar pulses output by the pre-amplification unit, and to store the chirp. A power amplification unit is used to amplify the power of the broadened pulse output from the first distributed dispersion management unit; A second distributed dispersion management unit is used to perform dispersion management, pulse compression, and tuning on the broadened pulse output from the power amplifier unit; The frequency conversion unit performs various nonlinear transformations on the chirp-free pulses at the femtosecond level output by the second distributed dispersion management unit to obtain pulse outputs with different center wavelengths for use in optical quantum computing. An integrated control unit is used to control the processing of the resonant cavity unit, pre-amplification unit, power amplification unit, and frequency conversion unit.

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