Optical quantum calculation-oriented fiber laser device and working method

Abstract

The invention relates to the field of ultrafast laser and light quantum, and provides a light quantum calculation-oriented fiber laser device and a working method. The fiber laser device comprises a resonant cavity unit used for generating mode-locked ultrashort pulses; the pre-amplification unit is used for carrying out nonlinear broadening and amplification on the mode-locked ultrashort pulse; the first distributed dispersion management unit is used for performing dispersion regulation and control and time domain broadening on the self-similar pulse output by the pre-amplification unit, and storing chirp; the power amplification unit is used for performing power amplification on the broadened pulse output by the first distributed dispersion management unit; the second distributed dispersion management unit is used for performing dispersion regulation, pulse compression and tuning on the broadened pulse output by the power amplification unit; and the frequency conversion unit is used for carrying out various non-linear conversion on the hundred-femtosecond chirp-free pulse output by the second distributed dispersion management unit to obtain pulse output with different central wavelengths so as to be used for light quantum direction calculation. The device has low chirp, high power and tunable frequency.

Description

Technical Field

[0001] The present invention relates to the field of ultrafast lasers and photons, and in particular to a fiber laser device and a working method for photon calculation. Background Art

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

[0003] Ultrafast fiber lasers are used in the field of quantum computing with their low cost, compactness and good anti-interference ability. They can provide stable and coherent light sources, providing a reliable basis for the operation and transmission of quantum bits. Ultrafast fiber lasers are used for the initialization of quantum bits. By adjusting the frequency and energy of the laser, the quantum bits are transitioned from the ground state to the target state, thus realizing the initialization of the quantum bits. Ultrafast fiber lasers can also be used for coupling and transmission between quantum bits. By adjusting the wavelength and power of the laser, mutual coupling between quantum bits can be achieved. At the same time, ultrafast fiber lasers have excellent beam quality, which can ensure the transmission quality between quantum bits and reduce errors in information transmission.

[0004] However, current ultrafast fiber lasers have several problems compared to traditional solid-state lasers when used in optical quantum computing. First, lasers use optical fiber as a gain and transmission medium, which inevitably has more significant dispersion problems (especially high-order dispersion), resulting in the broadening and distortion of light pulses, which in turn leads to a decrease in laser power density and coherence, and cannot meet the high requirements of light sources in optical quantum computing. Secondly, due to the small size of optical fibers, the output power of current ultrafast lasers (average power of more than 200mW) is still far from actual demand.

[0005] In summary, there are currently no dedicated ultrafast light source products on the market that are fully targeted at optical quantum computing. The existing products also have a significant gap with the requirements of optical quantum computing in core parameters such as chirp management, power levels and wavelength tuning. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a fiber laser device and a working method for optical quantum computing. The fiber laser device has low chirp, high power and frequency tunability, which will promote the low cost and high integration of optical quantum computing, and further promote the rapid development of optical quantum computing research and industrialization.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: A first aspect of the present invention provides a fiber laser device for optical quantum computing.

[0008] A fiber laser device for optical quantum computing, comprising: 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; A resonant cavity unit for generating mode-locked ultrashort pulses; A pre-amplification unit, used for nonlinear broadening and amplification of the mode-locked ultrashort pulse; The first distributed dispersion management unit is used to perform dispersion control and time domain broadening on the self-similar pulse output by the pre-amplification unit, and reserve chirp; A power amplification unit, used to power amplify the stretched pulse output by the first distributed dispersion management unit; A second distributed dispersion management unit is used to perform dispersion control, pulse compression and tuning on the stretched pulse output by the power amplification unit; The frequency conversion unit is used to perform multiple nonlinear conversions on the hundred-femtosecond chirp-free pulses output by the second distributed dispersion management unit to obtain pulse outputs with different central wavelengths for use in optical quantum computing.

[0009] Furthermore, the resonant cavity unit includes an adjustable optical fiber attenuator, an optical fiber dispersion compensator and a wavelength division multiplexer, wherein the adjustable optical fiber attenuator is used to adjust and control the loss in the cavity, the optical fiber dispersion compensator is used to adjust and control the dispersion in the cavity, and the wavelength division multiplexer is used to adjust and control the gain in the cavity.

[0010] Furthermore, the integrated control unit is equipped with a miniature spectrometer for detecting the spectrum of the mode-locked ultrashort pulse output by the resonant cavity unit, and controlling the adjustable optical fiber attenuator, optical fiber dispersion compensator and wavelength division multiplexer according to the detected power and spectrum until the output power and spectrum of the resonant cavity unit meet the set requirements of the mode-locked pulse.

[0011] Furthermore, the integrated control unit is also equipped with a built-in power detector for detecting the power of the mode-locked ultrashort pulse output by the resonant cavity unit.

[0012] Furthermore, the pre-amplification unit includes a section of normal dispersion gain fiber, a section of anomalous dispersion fiber and a first pump source.

[0013] Furthermore, after confirming that the output power and spectrum of the resonant cavity unit meet the set requirements of the mode-locked ultrashort pulse, the integrated control unit starts the preventive large-scale pumping, and uses the micro-spectrometer to detect in real time whether the mode-locked ultrashort pulse output by the pre-amplifier unit has completed self-similar evolution. If so, the pre-amplifier unit outputs a self-similar pulse; otherwise, the pump current is adjusted by controlling the first pump source, and the dispersion is adjusted by controlling the optical fiber dispersion compensator.

[0014] Furthermore, the power amplification unit includes a section of anomalous dispersion gain fiber, a section of polarization-maintaining fiber and a second pump source.

[0015] Furthermore, after confirming that the pre-amplification unit outputs a self-similar pulse, the integrated control unit turns on the main amplifier 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 amplifier unit outputs a stretched pulse with a power that meets the set requirements.

[0016] Furthermore, the frequency conversion unit includes a variety of replaceable nonlinear crystal modules and temperature control devices.

[0017] The second aspect of the present invention provides a method for operating a fiber laser device for optical quantum computing.

[0018] A method for operating a fiber laser device for optical quantum computing, comprising: The resonant cavity unit is used to generate mode-locked ultrashort pulses; A pre-amplifier unit is used to nonlinearly broaden and amplify the mode-locked ultrashort pulse; A first distributed dispersion management unit is used to perform dispersion management and time domain broadening on the self-similar pulse output by the pre-amplification unit, and to reserve chirp; A power amplification unit is used to power amplify the stretched pulse output by the first distributed dispersion management unit; A second distributed dispersion management unit is used to perform dispersion management, pulse compression and tuning on the stretched pulse output by the power amplification unit; The frequency conversion unit is used to perform multiple nonlinear conversions on the hundred-femtosecond chirp-free pulses output by the second distributed dispersion management unit to obtain pulse outputs with different central wavelengths for use in optical quantum computing. An integrated control unit is used to control the processing of the resonant cavity unit, the pre-amplification unit, the power amplification unit and the frequency conversion unit.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention proposes a fiber laser device and working method for optical quantum computing, which makes up for the gap between existing products and the requirements of optical quantum computing in core parameters such as chirp management, power level and wavelength tuning, and provides a feasible solution. Through the implementation of the solution, based on the advantages of fiber ultrafast lasers in compactness, integrability, economy and reliability, it provides another light source option for optical quantum computing applications, which is expected to help optical quantum computing research gradually get rid of dependence on imported solid ultrafast lasers and promote the industrialization of optical quantum computing.

[0020] The present invention proposes for the first time an ultrafast fiber laser solution with a multi-level structure. Based on intracavity regulation, global distributed dispersion management and adjustment, hybrid amplification mechanisms such as self-similar amplification and chirp pre-amplification, soliton self-frequency shift, nonlinear frequency conversion and other schemes, a femtosecond pulse output with near Fourier transform limit, high power and certain frequency tuning capability is obtained, which meets the special requirements of optical quantum computing for ultrafast light sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 is a structural diagram of a fiber laser device for optical quantum computing shown in the present invention; Among them, 1. resonant cavity unit, 11. programmable adjustable optical fiber attenuator, 12. optical fiber 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 DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment 1 like Figure 1 As shown, this embodiment provides a fiber laser device for optical quantum computing, including: a resonant cavity unit 1, a pre-amplifier 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, wherein the resonant cavity unit 1 is connected to the pre-amplifier unit 2, the pre-amplifier 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, wherein the resonant cavity unit 1, the pre-amplifier unit 2, the power amplification unit 4 and the frequency conversion unit 5 are all connected to the integrated control unit 6.

[0025] Specifically, the resonant cavity unit 1 includes a plurality of polarization-maintaining optical fiber devices including a programmable adjustable optical fiber attenuator 11, an optical fiber dispersion compensator 12, and a wavelength division multiplexer 13, which are used to generate mode-locked ultrashort pulses and serve as the seed light source of the entire scheme. The resonant cavity unit 1 adopts a typical ring cavity structure and operates based on a semiconductor saturable absorber mirror (SESAM) mode-locking (but not limited to SESAM mode-locking). Due to the use of optical fiber devices with different dispersion signs, the resonant cavity unit will operate in a breathing soliton mode-locking state or a traditional soliton mode-locking state.

[0026] Pre-amplifier unit 2 includes a long section of normal dispersion gain fiber, precisely matched abnormal dispersion fiber, pump source and coupling element (WDM). After the pump signal emitted by the pump source is coupled by WDM, the pump light passing through WDM is coupled into the normal dispersion gain fiber through the abnormal dispersion fiber. The pre-amplifier unit 2 nonlinearly broadens and amplifies the seed pulse light, preparing for subsequent amplification and pulse conditioning. Pre-amplifier unit 2 builds an erbium-doped fiber amplifier (EDFA) structure that realizes self-similar amplification. It uses forward pumping to pump 980nm light into the normal dispersion gain fiber through WDM, thereby realizing the amplification of the seed pulse input into the resonant cavity.

[0027] The first distributed dispersion management unit 31 and the second distributed dispersion management unit 32 are used for precise dispersion management and adjustment to avoid the generation of non-required nonlinearity and high-order dispersion. The dispersion management of 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 normal dispersion in the 1560nm band with a fiber pigtail fused thereto to realize a complete structure. By length matching fusion or selection of the total dispersion compensation amount of the device, different dispersion compensation amounts can be configured. In particular, by changing the length (for DCF) or the reflection wavelength (CFBG) of the second distributed dispersion management unit 32, the nonlinear accumulation amount of the transmitted ultrashort pulse light can be controlled, and the migration of the center wavelength can be achieved by using the soliton self-frequency shift (SSFS) principle, or the tuning of the center wavelength can be achieved directly by changing the reflection wavelength.

[0028] The power amplifier unit 4 includes: a short anomalous dispersion gain fiber, a precisely matched polarization-maintaining fiber, a pump source, and a coupling element (WDM). After the pump signal emitted by the pump source is coupled by WDM, the pump light passing through WDM is coupled into the polarization-maintaining fiber through the anomalous dispersion gain fiber. The power amplifier unit 4 performs low nonlinear power amplification on the ultrashort pulse light. The power amplifier unit 4 is based on the principle of pre-chirp amplification (CPA) and realizes the pre-broadening, amplification, and compression of the pulse through different dispersion devices. Similar to the pre-amplification unit, it is also a special erbium-doped fiber amplifier (taking into account the configuration combination of different dispersion devices), but adopts a backward or bidirectional pumping method to pump the 980nm light into the anomalous dispersion gain fiber through the WDM, thereby significantly amplifying the power of the input light.

[0029] The frequency conversion unit 5 includes a nonlinear crystal (PPLN, BBO, PPKTP, etc.) and a temperature control module, which is used for frequency conversion of ultrashort pulse light and expansion of wavelength coverage. The frequency conversion unit 5 generally also includes a collimator, a beam expansion lens group, a focusing lens, a collimation output lens and structural components. After the ultrashort pulse light outputted from the front is expanded, collimated and focused, it enters the nonlinear crystal and can achieve frequency conversion through nonlinear processes such as second harmonic generation (SHG), sum frequency generation (SFG), and difference frequency generation (DFG) to obtain laser output in other bands.

[0030] The integrated control unit 6 includes hardware circuits and control logic, which are used for integrated control of the entire system to obtain stable output. The integrated control unit 6 generally includes a combination of logic and control on-chip processors composed of FPGA and ARM chips, which collect and feedback control the data of other units. The simple control logic is: real-time acquisition of the final output laser parameters (including pulse width, spectrum and power). Under the premise that the output power meets the requirements, the pulse width and spectrum parameters are used as input to enter the built-in DSP unit of the FPGA for processing (the built-in algorithm of the DSP unit includes calculating the spectrum width and the pulse width product (time-bandwidth product), and comparing it with the Fourier transform limit value. If the calculated value is within the set range, no further adjustment is required. If it exceeds the range, the feedback adjustment reference parameters guide the adjustment of the system parameters until the parameter requirements are met.) For the specific control process, see the description below.

[0031] The fiber laser device of the present invention has the following working process: Under the management of the integrated control unit, the resonant cavity unit 1 realizes precise adjustment of intracavity loss, dispersion and gain through multiple core components in the cavity, namely, the programmable adjustable fiber attenuator 11, the fiber dispersion compensator 12 and the wavelength division multiplexer 13. The adjustable fiber attenuator 11 is connected to the fiber dispersion compensator 12, and the fiber dispersion compensator 12 is connected to the wavelength division multiplexer 13, so as to obtain a variety of stable target soliton morphology pulse outputs, which depends on the value of the intracavity net dispersion. At the same time, through the precise control of multiple core parameters, the mode-locked center wavelength tuning under the multiple mechanisms of gain saturation, reabsorption and saturable absorption can be performed, so as to obtain mode-locked pulse outputs with different center wavelengths.

[0032] The optical pulse with a certain central wavelength and soliton morphology output by the resonant cavity unit 1 first enters the pre-amplifier unit 2 for amplification. The optical pulse transmitted in the normal dispersion optical fiber contained in the pre-amplifier unit 2 will undergo self-similar evolution, achieving significant spectrum broadening while realizing the linear accumulation and gain of the chirp, which lays the foundation for subsequent pulse compression and power amplification.

[0033] After being amplified by the pre-amplifier unit 2, the pulse further enters the first distributed dispersion management unit 31, where the pulse will obtain further significant time domain broadening and reserve a large amount of chirp to prepare for subsequent power amplification.

[0034] The stretched pulse after passing through the first distributed dispersion management unit 31 continues to enter the power amplifier unit 4, which includes a shorter highly doped optical fiber and a programmable bidirectional pumping module. The stretched pulse will obtain significant power amplification in the shorter gain optical fiber based on the precisely managed programmable pumping (centrally controlled by the integrated control unit 6), while taking into account the low level of amplification of its accompanying noise.

[0035] After amplification by the power amplifier unit 4, the pulse is in a stretched state and a negative chirp state, and the width is generally in the order of several picoseconds. The stretched pulse continues to be transmitted into the second distributed dispersion management unit 32, and the pulse is compressed under the normal dispersion provided by the second distributed dispersion management unit 32, and a chirp-free pulse output of hundreds of femtoseconds is obtained. Based on the soliton transmission theory, the ultrashort pulse will be slowly red-shifted when it is transmitted in the optical fiber waveguide, that is, the 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 realize the tuning of the pulse center wavelength.

[0036] The pulse compressed by the second distributed dispersion management unit 32 continues to enter the frequency conversion unit 5, which contains a variety of replaceable nonlinear crystal modules and temperature control devices, and can perform a variety of nonlinear conversions including frequency doubling, sum frequency, difference frequency and parameter conversion on the femtosecond pulse to obtain pulse outputs with different central wavelengths, which are ultimately applied to the direction of optical quantum computing. Among them, the temperature control device is used to provide a specific temperature environment for the nonlinear process of the nonlinear crystal module.

[0037] It is further explained that the fiber laser device described in the present invention works together under the control logic and algorithm of the integrated control unit 6, from pulse output with flexible soliton morphology to multi-stage amplification, and under the precise control of distributed dispersion, linear chirp, spectral broadening, nonlinear utilization and suppression, pulse compression, power amplification and frequency conversion of the pulse are obtained, and finally ultrashort pulse output with time domain width, near-zero chirp and relatively high power is obtained.

[0038] In some embodiments, the control logic of the integrated control unit 6 is as follows: (1) The integrated control unit 6 collects the real-time output parameters of the resonant cavity through the power detector, temperature sensor and micro-spectrometer built into the resonant cavity, and respectively realizes the modulation of the cavity loss, dispersion and gain through the programmable adjustable fiber attenuator 11, fiber dispersion compensator 12 and wavelength division multiplexer 13 located in the resonant cavity, and forms a closed-loop control loop with the real-time output parameters until a mode-locked pulse output that meets the spectral and power characteristics is obtained. Among them, the temperature sensor is used to detect the temperature in the resonant cavity as an input parameter for regulating the cavity state.

[0039] (2) After confirming that the resonant cavity meets the required mode-locked pulse output, the integrated control unit 6 turns on the pre-amplifier stage pump and monitors in real time through the built-in micro-spectrometer whether the output spectrum has completed the self-similar evolution. It also forms a closed-loop control loop by finely controlling the pump current of the pump source in the pre-amplifier unit 2 and the power amplifier unit 4 and the dispersion in the pre-resonant cavity until the final self-similar pulse is output.

[0040] (3) After confirming that the pre-amplifier stage obtains the self-similar soliton pulse output, the integrated control unit 6 starts the main amplifier stage pump. Similarly, according to the pre-amplifier stage control method, a closed-loop control circuit is formed by finely controlling the pump current and the dispersion of the pre-dispersion compensation unit, thereby ultimately achieving power amplification and strictly suppressing nonlinearity.

[0041] (4) Integrate the control unit 6 with multiple sensor devices (temperature sensors, Multi-spectral sensors, power sensors, etc.) and control modules form multiple control loops to achieve fine adjustment of multiple parameters and ultimately control of the entire machine. Multiple control loops are independent of each other but interrelated. By collecting and recording operation and control data, a mapping relationship between the two is established. With the help of mature machine learning algorithms, the optimal control logic is obtained through optimization iteration and applied to real-time control processes.

[0042] In some embodiments, the first distributed dispersion management unit 31 and the second distributed dispersion management unit 32 further include dispersion devices of various modules of the solution, which together constitute a complete distributed dispersion management structure, making the dispersion management more refined.

[0043] The innovation of the present invention lies first in that it aims at the demand for ultrafast light sources in optical quantum computing. For the first time, an ultrafast fiber laser solution with a multi-level structure is proposed. Based on intracavity regulation, global distributed dispersion management and adjustment, hybrid amplification mechanisms such as self-similar amplification and chirp pre-amplification, soliton self-frequency shift, nonlinear frequency conversion and other schemes, a femtosecond pulse output with near Fourier transform limit, high power and certain frequency tuning capability is obtained, which meets the special needs of optical quantum computing for ultrafast light sources.

[0044] The innovation of this invention also lies in that it is the first time that a complete solution and working logic of ultrafast laser dedicated to optical quantum computing based on optical fiber medium are proposed and described in detail, which provides another light source option for optical quantum computing applications and has potential advantages over traditional solid-state lasers in compactness, integrability, economy and reliability.

[0045] Embodiment 2 This embodiment provides a method for operating a fiber laser device for optical quantum computing, including: A method for operating a fiber laser device for optical quantum computing, comprising: The resonant cavity unit is used to generate mode-locked ultrashort pulses; A pre-amplifier unit is used to nonlinearly broaden and amplify the mode-locked ultrashort pulse; A first distributed dispersion management unit is used to perform dispersion management and time domain broadening on the self-similar pulse output by the pre-amplification unit, and to reserve chirp; A power amplification unit is used to power amplify the stretched pulse output by the first distributed dispersion management unit; A second distributed dispersion management unit is used to perform dispersion management, pulse compression and tuning on the stretched pulse output by the power amplification unit; The frequency conversion unit is used to perform multiple nonlinear conversions on the hundred-femtosecond chirp-free pulses output by the second distributed dispersion management unit to obtain pulse outputs with different central wavelengths for use in optical quantum computing. An integrated control unit is used to control the processing of the resonant cavity unit, the pre-amplification unit, the power amplification unit and the frequency conversion unit.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fiber laser device for optical quantum computing, characterized in that: include: 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; A resonant cavity unit for generating mode-locked ultrashort pulses; A pre-amplification unit, used for nonlinear broadening and amplification of the mode-locked ultrashort pulse; The first distributed dispersion management unit is used to perform dispersion control and time domain broadening on the self-similar pulse output by the pre-amplification unit, and reserve chirp; A power amplification unit, used to power amplify the stretched pulse output by the first distributed dispersion management unit; A second distributed dispersion management unit is used to perform dispersion control, pulse compression and tuning on the stretched pulse output by the power amplification unit; The frequency conversion unit is used to perform multiple nonlinear conversions on the hundred-femtosecond chirp-free pulses output by the second distributed dispersion management unit to obtain pulse outputs with different central wavelengths for use in optical quantum computing.

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

3. The optical fiber laser device for optical quantum computing according to claim 2, characterized in that: The integrated control unit is equipped with a micro-spectrometer for detecting the spectrum of the mode-locked ultrashort pulse output by the resonant cavity unit, and controlling the adjustable optical fiber attenuator, optical fiber dispersion compensator and wavelength division multiplexer according to the detected power and spectrum until the resonant cavity unit outputs a mode-locked pulse with both power and spectrum meeting the set requirements.

4. The optical fiber laser device for optical quantum computing according to claim 2, characterized in that: 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.

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

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

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

8. The optical fiber laser device for optical quantum computing according to claim 7, characterized in that: After confirming that the pre-amplification unit outputs a self-similar pulse, the integrated control unit turns on the main amplifier 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 amplifier unit outputs a stretched pulse with a power that meets the set requirements.

9. The optical 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.

10. A method for operating a fiber laser device for optical quantum computing, characterized in that: include: The resonant cavity unit is used to generate mode-locked ultrashort pulses; A pre-amplifier unit is used to nonlinearly broaden and amplify the mode-locked ultrashort pulse; A first distributed dispersion management unit is used to perform dispersion management and time domain broadening on the self-similar pulse output by the pre-amplification unit, and to reserve chirp; A power amplification unit is used to power amplify the stretched pulse output by the first distributed dispersion management unit; A second distributed dispersion management unit is used to perform dispersion management, pulse compression and tuning on the stretched pulse output by the power amplification unit; The frequency conversion unit is used to perform multiple nonlinear conversions on the hundred-femtosecond chirp-free pulses output by the second distributed dispersion management unit to obtain pulse outputs with different central wavelengths for use in optical quantum computing. An integrated control unit is used to control the processing of the resonant cavity unit, the pre-amplification unit, the power amplification unit and the frequency conversion unit.

Images