Inter-Chip Qubit Controller for Delay-Aware Cross-Resonance Readout
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Solution Overview
Problem
In quantum computers with qubits placed on different chips, optimizing control and readout timings for cross-resonance coupling is challenging due to increased transmission delays, leading to decreased readout accuracy and prolonged computation times.
Innovation Solution
A controller with a control circuit, read circuit, and adjustment circuit is employed to adjust the control and readout timings based on measured delays between qubits, optimizing these timings to improve accuracy and reduce computation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If qubits for cross-resonance coupling are placed on different chips, then device scalability is improved, but transmission delay increases
Solution Approach 1:
The quantum computing system is divided into multiple chips, each containing qubits that can be independently manufactured and tested. This segmentation allows for scalable device construction while the controller compensates for inter-chip transmission delays through timing adjustment
Solution Approach 2:
The controller dynamically adjusts the timing parameters of control signals and readout operations based on the specific transmission delays between qubits on different chips. By changing the temporal parameters of operations, the system optimizes performance despite variable transmission delays
2Volume of moving object
If transmission delay between qubits on different chips increases, then device scalability is improved, but readout accuracy deteriorates
Solution Approach 1:
The system measures the actual transmission delays between qubits and uses this feedback information to adjust control and readout timings. This closed-loop approach ensures that readout accuracy is maintained despite variations in transmission delay caused by different chip configurations
3Device complexity
If fixed control and readout timings are used, then device complexity is reduced, but computation time increases
Solution Approach 1:
The controller implements dynamic timing adjustment for control signals and readout operations based on measured transmission delays. This dynamic approach replaces fixed timings with adaptive timing that optimizes computation speed while maintaining manageable device complexity through automated adjustment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The controller enhances readout accuracy and reduces computational time by dynamically adjusting control and readout timings, effectively handling increased delays in qubits placed on different chips.
Implementation Method 1
a cross-resonance gate that couples a plurality of qubits
Data Source
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AI summary
A controller includes a control circuit configured to output a control signal to cause cross-resonance between a plurality of qubits that are placed on different chips, to one of the plurality of qubits, a read circuit configured to output readout signals for performing readout from the plurality of qubits to the respective qubits; and an adjustment circuit configured to adjust an interval between an output of the control signal and outputs of the readout signals based on a delay between the plurality of qubits.