Quantum Control Line Delay Calibration for Qubit Timing Alignment
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Solution Overview
Problem
In quantum computer systems, the differing lengths of transmission lines and the presence of various microwave devices cause signal delays, leading to inaccurate control of quantum states as control signals do not reach the quantum chip in the designed time sequence, affecting the precision of qubit control.
Innovation Solution
A calibration method and apparatus that apply control signals to a quantum chip through transmission lines, updating the delay within a preset range to identify and compensate for relative delays, ensuring that control signals align properly, thereby performing delay calibration to synchronize the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different length transmission lines and microwave devices are used to control quantum states, then the quantum computer system can perform multiple control functions, but the transmission delays of signals on different lines become different, causing control signals to not reach the quantum chip in the designed time sequence
Solution Approach 1:
The patent applies preliminary action by measuring and determining the transmission delays of different transmission lines before actual quantum control operations. The system pre-calibrates the delay values for each transmission line and stores them for subsequent compensation during control signal transmission, ensuring that control signals arrive at the quantum chip in the correct time sequence.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the delay parameters of control signals based on the measured transmission line characteristics. The system modifies the timing parameters of control signals to compensate for different transmission delays, transforming the fixed delay problem into a dynamically adjustable parameter that can be optimized for each transmission line.
2Manufacturing precision
If transmission line lengths are made equal to eliminate delay differences, then signal timing accuracy improves, but the system loses the flexibility to add different microwave devices and adjust line configurations
Solution Approach 1:
The patent applies copying by creating a virtual model or calibration data set that represents the transmission characteristics of each transmission line. Instead of physically modifying the transmission lines to be equal in length, the system copies the delay characteristics into a lookup table or calibration database, allowing the system to compensate for physical differences through data rather than hardware uniformity.
3Manufacturing precision
If delay calibration is performed for each transmission line, then control signal timing accuracy improves, but the calibration process time and system complexity increase
Solution Approach 1:
The patent performs delay calibration as a preliminary action during system initialization or setup phase, rather than during every quantum control operation. The measured delay values are stored and reused for subsequent control operations, making the initial time investment worthwhile by enabling fast, accurate control without repeated calibration overhead.
Data Source
AI summary
A calibration method and a calibration apparatus for a delay of a quantum computer system, wherein when the calibration method is implemented, a first control signal is first applied to the qubit on the quantum chip through the first transmission line, simultaneously a second control signal with a preset delay is applied to the qubit through the second transmission line, then the preset delay is updated sequentially within a preset range, and the second control signal with updated preset delay is applied to the qubit, so as to obtain a change curve representing a probability of the quantum state of the qubit being an eigenstate as a function of the preset delay, and then it is determined whether the change curve has a trough, if the change curve has a trough, finally, delay calibration is performed for the first transmission line and the second transmission line based on the preset delay corresponding to the trough of the change curve, so as to eliminate the transmission delay caused by different line lengths and different microwave devices added on the lines, so that the control signals on different lines can reach the quantum chip according to the designed time sequence, thereby realizing the precise regulation of the quantum states.