Trimmable Superconducting Inductors for Qubit Frequency Collision Avoidance
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Solution Overview
Problem
Superconducting quantum computing systems face challenges in accurately tuning the resonant frequencies of qubits post-fabrication, leading to potential frequency collisions and impaired system operation.
Innovation Solution
The implementation of trimmable superconducting inductors, which can be modified during post-fabrication processing by severing or welding superconducting bridges to alter the inductance and thus the resonant frequency of qubits, allowing for precise tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If qubit resonant frequencies are tuned post-fabrication using conventional methods, then frequency accuracy can be improved, but system complexity and processing time increase significantly
Solution Approach 1:
The inductor is divided into multiple parallel conductive paths, each with a trimmable section that can be independently modified. This segmentation allows precise control of total inductance by selectively removing portions of individual paths, enabling accurate frequency tuning without complex overall restructuring.
Solution Approach 2:
The invention changes the inductance parameter of the inductor by removing conductive material (severing conductive paths). This direct modification of the physical structure alters the electrical parameter (inductance), which in turn tunes the resonant frequency of the qubit. The parameter change is achieved through simple material removal rather than complex adjustment mechanisms.
2Reliability
If conventional frequency tuning methods are used, then frequency collisions can be avoided, but fabrication time and processing steps increase
Solution Approach 1:
The inductor is designed with preliminary trimmable sections that are prepared during fabrication but not yet activated. These sections are strategically positioned and sized so that selective removal can achieve the desired frequency tuning range. The preliminary structure is built to facilitate easy modification without requiring complex post-fabrication assembly or adjustment procedures.
3Measurement precision
If inductance is increased to tune down qubit frequency, then frequency collisions are prevented, but the physical size of the inductor increases
Solution Approach 1:
The inductor uses multiple parallel conductive paths arranged in a planar configuration. By controlling which paths are active (intact) and which are inactive (severed), the effective inductance is adjusted in the electrical dimension rather than requiring proportional increases in physical area. The parallel path architecture allows inductance scaling without linear scaling of footprint.
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
This approach enables quick and accurate tuning of qubit resonant frequencies without affecting coherence or performance, addressing the issue of frequency collisions and enhancing system operation.
Implementation Method 1
a Josephson junction
Implementation Method 2
a resonant frequency of a qubit formed by the Josephson junction and the capacitor
Data Source
AI summary
Systems and techniques that facilitate trimmable inductors for qubit frequency tuning are provided. In various embodiments, a device can comprise a Josephson junction. In various aspects, the Josephson junction can be shunted by a capacitor, and a trimmable inductor can couple the Josephson junction to a pad of the capacitor. In various cases, the trimmable inductor can comprise a first conductive path that includes a severable and/or weldable superconducting bridge and a second conductive path that is in parallel with the first conductive path. In various aspects, severing and/or welding the severable and/or weldable superconducting bridge can controllably change an inductance of the trimmable inductor, which can commensurately change a resonant frequency of a qubit formed by the Josephson junction and the capacitor.