Superconducting Quantum Circuit Grounding to Suppress Qubit Crosstalk
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Solution Overview
Problem
Quantum circuits using superconducting circuits face challenges in completely turning off unnecessary interactions between quantum bits, leading to residual interactions that cause errors and reduce computational accuracy and precision.
Innovation Solution
A superconducting complex quantum computing circuit design with a circuit substrate, ground patterns, through-substrate electrodes, and control signal lines, including non-contact and contact portions with superconducting extension portions, to suppress interactions and crosstalk between quantum bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional quantum circuit configuration is used, then the circuit can be implemented with standard design, but residual interaction between quantum bits cannot be completely turned off, causing control errors and error propagation
Solution Approach 1:
A ground electrode with a non-contact portion is introduced as an intermediary structure between quantum bits. This ground electrode includes a contact portion that contacts the substrate and a non-contact portion that faces the quantum bit without direct contact, mediated by a predetermined distance. This intermediary structure suppresses residual interactions and crosstalk while maintaining quantum bit operation accuracy
Solution Approach 2:
The ground electrode is designed with spatially varying properties: the contact portion provides electrical grounding through substrate contact, while the non-contact portion provides electromagnetic shielding at a predetermined distance from the quantum bit. This local differentiation of grounding and shielding functions reduces residual interactions without affecting overall circuit operation
2Object-generated harmful factors
If ground electrodes are placed close to quantum bits for shielding, then crosstalk suppression improves, but direct contact may cause unwanted interactions and control errors
Solution Approach 1:
The ground electrode acts as an intermediary shielding structure that maintains an optimal distance from the quantum bit. The non-contact portion provides electromagnetic shielding to suppress crosstalk, while the predetermined distance prevents direct contact that would cause unwanted interactions and control errors
Solution Approach 2:
The ground electrode is electrically connected to ground potential through the contact portion, creating an equipotential shielding structure. This equipotential ground electrode suppresses electromagnetic fluctuations and crosstalk between quantum bits without requiring direct contact with the quantum bits themselves
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 design effectively suppresses interaction and crosstalk between quantum bits, enhancing error tolerance and computational precision by minimizing residual interactions and electromagnetic mode leakage.
Implementation Method 1
a first extension portion formed by a superconductor having extensibility higher than extensibility of the ground pattern, and the second ground electrode is in contact with the ground pattern via a second extension portion formed by a superconductor having extensibility higher than the extensibility of the ground pattern
Data Source
AI summary
A superconducting complex quantum computing circuit includes a circuit substrate in which a wiring pattern of a circuit element including quantum bits and measurement electrodes, and ground patterns are formed, and through-electrodes connecting the ground pattern formed on a first surface of the substrate surface and the ground pattern formed on a second surface; a first ground electrode including a first contact portion in contact with the ground patterns, and a first non-contact portion having a shape corresponding to a shape of the wiring pattern; a second ground electrode including a second contact portion in contact with the ground pattern; a control signal line provided with a contact spring pin at a tip; and a pressing member that presses the first ground electrode against the first surface of the circuit substrate or presses the second ground electrode against the second surface of the circuit substrate.