Quantum Device Wiring Pattern Crosstalk Reduction
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Solution Overview
Problem
Existing quantum devices with superconducting circuits face challenges in improving signal quality due to crosstalk issues between qubits and couplers, particularly in networks with four-body interaction couplers, where specific wiring configurations are not adequately addressed.
Innovation Solution
A quantum device is designed with a wiring layer that includes multiple qubits and couplers, featuring specific patterns of input/output, pump, and control lines to reduce crosstalk, such as alternating arrangements of IO and pump lines, and strategically placing control lines to minimize interference between signal transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple qubits and couplers are densely arranged in a quantum network, then the functionality and interaction capability are improved, but crosstalk between signal transmission lines increases and signal quality deteriorates
Solution Approach 1:
The patent segments the wiring into distinct functional groups (IO lines, pump lines, control lines) and further divides them into even and odd indexed subsets. This segmentation allows systematic arrangement where even-indexed lines are dedicated to qubit connections and odd-indexed lines to coupler connections, physically separating different signal types to reduce crosstalk while maintaining dense packing.
Solution Approach 2:
The patent applies different wiring patterns in different spatial regions. Specifically, it uses alternating patterns for even and odd indexed lines, and different patterns for qubit-associated lines versus coupler-associated lines. This local differentiation optimizes signal isolation in specific areas where crosstalk is most problematic while maintaining overall network functionality.
2Object-affected harmful factors
If IO lines and pump lines are arranged in alternating patterns, then crosstalk between signal lines is reduced, but wiring complexity increases
Solution Approach 1:
The patent implements periodic alternating patterns in the wiring arrangement. IO lines and pump lines alternate in a regular periodic fashion, as do even and odd indexed lines. This periodic structure reduces crosstalk through systematic spatial separation while the regularity of the pattern actually simplifies the overall design and manufacturing process compared to irregular complex arrangements.
3Object-affected harmful factors
If control lines are strategically placed to minimize interference, then signal quality is improved, but the complexity of wiring design increases
Solution Approach 1:
The patent assigns control lines to specific spatial regions based on their function. Even-indexed control lines are placed in regions dedicated to even-indexed qubits, while odd-indexed control lines serve odd-indexed qubits. This localized assignment minimizes interference by ensuring control lines primarily interact with their intended targets rather than crossing or adjacent to unrelated signal lines.
Solution Approach 2:
The control wiring is segmented into even and odd indexed groups, each serving specific subsets of qubits. This segmentation creates distinct control zones that reduce cross-interference between control lines and between control and signal lines, while the systematic segmentation pattern simplifies the overall wiring design methodology.
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 proposed configuration enhances signal quality by reducing crosstalk between lines, thereby improving the performance of quantum networks with qubits and couplers, particularly in four-body interaction scenarios.
Implementation Method 1
a first line capacitively coupled to each of the plurality of qubits
Implementation Method 2
a second line inductively coupled to each of the plurality of qubits
Implementation Method 3
a third line capacitively coupled to each of the plurality of couplers
Implementation Method 4
a fourth line inductively coupled to each of the plurality of couplers
Implementation Method 5
a non-linear inductor such as a Josephson junction
Data Source
AI summary
A quantum device includes on a wiring pattern of first lines and second lines coupled capacitively and inductively to qubits, respectively, and third lines and fourth lines coupled capacitively and inductively to couplers, respectively. The wiring pattern includes a first pattern of adjacent three lines in which one of the second line and the fourth line is disposed between two lines selected from the first lines and the third lines, and/or a second pattern of adjacent three lines in which two lines selected from the second lines and the fourth lines are disposed on both sides of one of the first line and the third line.