CPW Step-Impedance Resonator Layout for Compact Quantum Chips
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Solution Overview
Problem
Conventional superconducting quantum chips face challenges in reducing size and improving integration level due to the use of coplanar waveguide-uniformity impedance resonators, which occupy large space despite efforts to arrange resonators in a meander line configuration.
Innovation Solution
Implementing a Coplanar Waveguide-Step Impedance Resonator (CPW-SIR) unit, specifically a CPW-2-Step or CPW-3-Step unit, with adjustable electrical length and characteristic impedance ratios, allowing for a miniaturized design by reducing the electrical length of resonators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If coplanar waveguide-uniformity impedance resonators (CPW-UIR) are used in conventional superconducting quantum chips, then the resonators can be arranged in meander line configuration, but the chip size still occupies large space and integration level is limited
Solution Approach 1:
The patent applies parameter changes by transitioning from uniform impedance resonators to step impedance resonators with varying characteristic impedances (e.g., 50Ω, 75Ω, 100Ω sections). This parameter variation enables compact resonator design with reduced electrical length while maintaining resonant functionality, directly addressing the chip size reduction goal
Solution Approach 2:
The resonator is segmented into multiple sections with different impedance values along its length. This segmentation allows the resonator to achieve the same resonant frequency with a physically shorter structure, enabling higher integration density and smaller chip area
2Area of stationary object
If resonators are arranged in meander line configuration to shorten chip size, then space is reduced, but the integration level and degree of freedom are still constrained
Solution Approach 1:
By implementing step impedance resonators with adjustable impedance ratios and electrical lengths, the design achieves flexible parameter tuning. This allows optimization of both spatial footprint and functional performance, enhancing adaptability for different quantum circuit configurations
Solution Approach 2:
The resonator design incorporates adjustable electrical length and impedance parameters that can be dynamically optimized for different operating conditions and quantum bit configurations, providing design flexibility and degree of freedom
Data Source
AI summary
The present disclosure discloses a superconducting quantum chip and parameter determination method therefor, and relates to the field of quantum chips. The superconducting quantum chip includes a chip substrate and a quantum module formed on the chip substrate. The quantum module includes a bit capacitor unit, a readout line unit, and a Josephson junction unit. The quantum module further includes a Coplanar Waveguide-Step Impedance Resonator (CPW-SIR) unit. In the superconducting quantum chip disclosed by the present application, functions of a resonator are realized by virtue of the CPW-SIR unit. Thanks to physical properties of the CPW-SIR unit, in a same parallel resonance condition, compared with a Uniformity Impedance Resonator (UIR), the electrical length of the SIR is obviously less