IIR Waveform Calibration Circuit for Low-Latency Qubit Control
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Solution Overview
Problem
Conventional quantum computing methods require significant communication delays for waveform calibration due to operations at upper computers, which cannot meet the low-delay requirements necessary for precise qubit control.
Innovation Solution
A system and method for controlling signals in quantum computing using an infinite impulse response (IIR) digital filter in a waveform calibration circuit, which pre-compensates and pre-calibrates control signals directly on a qubit control line, eliminating the need for communication delays by performing calibration locally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If waveform calibration is performed through upper computer operations, then calibration accuracy can be achieved, but communication delay increases significantly
Solution Approach 1:
The patent introduces an FPGA as an intermediary device between the upper computer and the qubit control system. The FPGA receives calibration parameters from the upper computer and performs real-time waveform calibration locally, acting as a mediator that eliminates the need for continuous host computer intervention and reduces communication delay while maintaining calibration accuracy
Solution Approach 2:
The patent implements preliminary waveform calibration by pre-processing control signals through an IIR digital filter in the FPGA before they reach the qubit control line. This preliminary action ensures that waveform distortion is corrected in advance, eliminating the need for real-time upper computer processing and reducing communication delay
2Manufacturing precision
If real-time waveform calibration is implemented, then qubit control precision is improved, but system complexity increases
Solution Approach 1:
The patent replaces complex software-based waveform calibration algorithms running on the upper computer with a hardware-based IIR digital filter implementation in the FPGA. This substitution of mechanical/computational system with a dedicated hardware circuit achieves real-time calibration with deterministic timing and reduced system complexity
Solution Approach 2:
The patent designs a universal calibration system using an FPGA that can handle multiple qubit control lines and various waveform calibration requirements through a single reconfigurable hardware platform. The IIR digital filter is implemented in a way that can be applied to different control scenarios, reducing overall system complexity through multi-functionality
Data Source
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AI summary
A system and a method for controlling a signal in quantum computing, and a waveform calibration circuit, which relate to the technical fields of computers and digital signal processing. The signal control system includes: a signal source, a waveform calibration circuit, a qubit control line, and a qubit module. The signal source is configured to generate an original control signal. The waveform calibration circuit includes at least one IIR digital filter, and the IIR digital filter is configured to calibrate a waveform of the original control signal to obtain a calibrated control signal. The qubit control line is configured to convey the calibrated control signal to the qubit module. The qubit module is configured to generate a qubit. The calibrated control signal is applied on the qubit after passing through the qubit control line, and is configured to control the qubit.