CN-122018604-A - Optical power compensation system

CN122018604ACN 122018604 ACN122018604 ACN 122018604ACN-122018604-A

Abstract

The invention discloses an optical power compensation system, which comprises a laser generating module, a power adjusting module, a transmission optical fiber, a polarization selecting module, a fluorescence detecting module and a control unit, wherein the laser generating module is used for generating control light, the power adjusting module is used for receiving a power adjusting instruction of a control unit and adjusting the output light power of the control light according to the power adjusting instruction, the transmission optical fiber is used for transmitting the adjusted control light, the polarization selecting module is used for separating the control light and forming control light with a target polarization state so that the control light with the target polarization state is incident into trapping ions, the fluorescence detecting module is used for collecting fluorescent signals generated by the trapping ions under the irradiation of the control light and processing the fluorescent signals, and the control unit is respectively and electrically connected with the fluorescence detecting module and the power adjusting module and used for determining the output light power of the control light according to the fluorescent signals and generating the power adjusting instruction to the power adjusting module when the output light power is out of a preset power range. By utilizing the structure, closed loop stability of optical power density of caged ions is realized, and the accuracy of door control is improved.

Inventors

LIU ZHICHAO
HU XIAOBAO
CHEN DONGMEI
GONG RUI
Chen Duochao
ZHOU DEZE
WU JUNFENG
XU KEBIAO
HE YU

Assignees

国仪量子技术(合肥)股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (12)

1. An optical power compensation system, comprising: the laser generation module is used for generating control light; The power adjusting module is used for receiving a power adjusting instruction of the control unit and adjusting the output light power of the control light according to the power adjusting instruction; The transmission optical fiber is used for transmitting the adjusted control light; The polarization selection module is used for separating the control light and forming control light with a target polarization state, so that the control light with the target polarization state is incident into confined ions to drive a quantum gate operation process in a main calculation process; The fluorescence detection module is used for collecting fluorescence signals generated by the caged ions under the irradiation of the control light and carrying out signal processing on the fluorescence signals; And the control unit is respectively and electrically connected with the fluorescence detection module and the power adjustment module and is used for determining the output light power of the control light according to the fluorescence signal and generating the power adjustment instruction to the power adjustment module when the output light power is out of a preset power range.
2. The optical power compensation system of claim 1, wherein the control unit is configured to switch an operational state of the main calculation process to a suspended state after a preset period of time after the main calculation process is performed, and to trigger a compensation process when the suspended state.
3. The optical power compensation system of claim 2 wherein the compensation process comprises calculating a ratio frequency of the trapped ions and power compensating the steering light based on the ratio frequency.
4. The optical power compensation system of claim 3 wherein the compensation process further comprises initializing the trapping ions.
5. The optical power compensation system of claim 4, further comprising an auxiliary laser module, wherein the auxiliary laser module is electrically connected to the control unit; The control unit is also used for controlling the auxiliary laser module to initialize the trapping ions so as to enable the states of the trapping ions to be in an initial quantum state, and the initialization comprises cooling and state preparation.
6. The optical power compensation system of claim 5 wherein the cooling comprises doppler cooling, EIT cooling, or sideband cooling.
7. The optical power compensation system of claim 2 wherein the control unit is further configured to trigger a verification process after the compensation process is completed.
8. The optical power compensation system according to claim 7, wherein the verification process includes sequentially applying a plurality of preset inspection quantum gate pulses to the manipulation light, recording a plurality of secondary detection results output by the fluorescence detection module after each application, counting the number of times the trapped ions are in a target quantum state according to each secondary detection result to determine an actual measurement turnover probability of the target quantum state, determining whether a deviation amount between the actual measurement turnover probability and the theoretical turnover probability is within a preset deviation range according to the actual measurement turnover probability and the theoretical turnover probability corresponding to the inspection quantum gate pulse, and if so, ending the verification.
9. The optical power compensation system of claim 8, wherein the secondary detection result is configured to record as a first detection state when the fluorescence detection module detects a fluorescence signal, and to record as a second detection state when the fluorescence detection module does not detect a fluorescence signal, wherein a state of the trapped ion corresponding to the first detection state is in an excited state, a state of the trapped ion corresponding to the second detection state is in an initial quantum state, and the target quantum state is the first detection state.
10. The optical power compensation system of claim 1 wherein the polarization selection module comprises at least one of a polarization splitting prism, a gram-taylor prism, and a polarization maintaining fiber coupler.
11. The optical power compensation system of claim 1 wherein the power conditioning module comprises at least one of an acousto-optic modulator, an electro-optic modulator, and a programmable optical attenuator.
12. The optical power compensation system of claim 1 wherein the fluorescence detection module comprises at least one of a photomultiplier tube and an avalanche photodiode.

Description

Optical power compensation system Technical Field The present invention relates to the field of optical power compensation, and in particular, to an optical power compensation system. Background The stability of ion-sensitive laser parameters such as orientation, power, polarization, phase, etc. has a direct relationship with the stability of ion trap quantum computing gate manipulation. However, after passing through the optical fiber, the laser light affects various parameters of the laser light due to the influence of temperature and mechanical properties on the optical fiber. Conventional optical power compensation is typically performed by adding a fixed proportion of spectroscope for detection and feedback prior to ion irradiation. However, the use of beam splitters on the one hand brings about a loss of power and on the other hand causes some polarization impurities and no drift in the light direction can be detected. Disclosure of Invention The invention provides an optical power compensation system, which converts polarization drift into compensatory power change by taking intrinsic fluorescence of caged ions as a feedback signal and combining a polarization selection module, so that closed loop stability of effective optical power density of the caged ions is realized, light splitting loss and polarization degradation are avoided, meanwhile, the influence of light pointing drift is restrained, and the accuracy and the calculation efficiency of door control are remarkably improved. The invention provides an optical power compensation system, comprising: the laser generation module is used for generating control light; the power adjusting module is used for receiving a power adjusting instruction of the control unit and adjusting the output light power of the control light according to the power adjusting instruction; the transmission optical fiber is used for transmitting the regulated control light; The polarization selection module is used for separating the control light and forming the control light with the target polarization state so that the control light with the target polarization state is incident into trapping ions to drive the quantum gate operation process in the main calculation process; The fluorescence detection module is used for collecting fluorescence signals generated by caged ions under the irradiation of control light and processing the fluorescence signals; The control unit is respectively and electrically connected with the fluorescence detection module and the power adjustment module and is used for determining the output light power of the control light according to the fluorescence signal and generating a power adjustment instruction to the power adjustment module when the output light power is out of a preset power range. Optionally, the control unit is configured to switch the running state of the main calculation process to a suspended state after a preset time period after the main calculation process is executed, and to trigger the compensation process when in the suspended state. Optionally, the compensating process includes calculating a ratio frequency of the trapped ions and power compensating the steering light based on the ratio frequency. Optionally, the compensation process further comprises initializing caged ions. Optionally, the system further comprises an auxiliary laser module, wherein the auxiliary laser module is electrically connected with the control unit; The control unit is also used for controlling the auxiliary laser module to initialize the trapped ions so as to enable the states of the trapped ions to be in an initial quantum state, and the initialization comprises cooling and state preparation. Optionally, the cooling comprises doppler cooling, EIT cooling or sideband cooling. Optionally, the control unit is further configured to trigger a verification process after the compensation process is ended. Optionally, the verification process includes sequentially applying a plurality of preset detection quantum gate pulses to the control light, recording a plurality of secondary detection results output by the fluorescence detection module after each application, counting the times of trapping ions in the target quantum state according to each secondary detection result to determine actual measurement turnover probability of the target quantum state, determining whether the deviation between the actual measurement turnover probability and the theoretical turnover probability is within a preset deviation range according to the actual measurement turnover probability and the theoretical turnover probability corresponding to the detection quantum gate pulse, and if yes, finishing the verification. Optionally, the secondary detection result is configured to record as a first detection state when the fluorescence detection module detects the fluorescence signal, and record as a second detection state when the fluorescence detection module does not det