Superconducting Qubit Resonator Architecture for Coherence Scaling
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Solution Overview
Problem
Current superconducting quantum computing technologies face challenges in scaling up due to the introduction of lossy materials and connections, which limit qubit coherence times and degrade performance, particularly at transition and connection regions in flip chip technology and through-silicon-vias.
Innovation Solution
A compact lumped element resonator structure is implemented, spanning two superconducting circuit planes, where capacitive energy is maintained on one plane and inductive energy on the other, keeping electrical currents off the qubit plane and on the readout path, with well-controlled electromagnetic fields to avoid coupling with lossy parts of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flip chip technology and through-silicon-vias are used for scaling, then device integration is improved, but lossy materials and connections are introduced that degrade qubit coherence
Solution Approach 1:
The resonator is divided into two separate surfaces: Surface 1 contains the inductive element, while Surface 2 contains the capacitive elements and qubits. This segmentation allows the lossy connection regions (through-silicon-vias) to be isolated from the qubit plane, preventing them from degrading qubit coherence while still enabling scaled integration through the flip chip architecture.
Solution Approach 2:
The patent introduces an intermediary structure where the inductive element on Surface 1 couples to capacitive elements on Surface 2 through controlled electromagnetic fields. This intermediary coupling mechanism allows signal transmission between surfaces without requiring direct physical connections near the qubits, thereby maintaining qubit coherence while enabling device scaling.
2Ease of manufacture
If conventional resonator structures are used, then manufacturing is simplified, but electrical currents couple with lossy parts causing decoherence
Solution Approach 1:
The resonator structure transitions from a planar single-surface design to a three-dimensional multi-surface configuration. The inductive element resides on Surface 1 while capacitive elements are positioned on Surface 2, creating vertical separation that prevents current coupling with lossy materials. This dimensional change maintains manufacturability through standard flip chip processes while eliminating decoherence pathways.
3Quantity of substance
If qubit plane contains all circuit elements, then circuit density is improved, but lossy connections directly affect qubit performance
Solution Approach 1:
The inductive element is extracted from the qubit plane (Surface 2) and placed on a separate Surface 1. This extraction removes the source of electromagnetic interference and lossy connections from proximity to the qubits, eliminating the harmful decoherence effect while preserving circuit density through the compact flip chip architecture.
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 enhances qubit coherence by isolating lossy components from the qubit plane, reducing decoherence effects and allowing for a smaller footprint in quantum circuits, thus facilitating the scaling of superconducting quantum computing hardware.
Implementation Method 1
The electromagnetic energy associated with the qubit can be stored in so-called Josephson junctions and in the capacitive and inductive elements that are used to form the qubit
Implementation Method 2
with well-controlled electromagnetic fields to avoid coupling with lossy parts of the system
Data Source
AI summary
A technique relates to a structure. A first surface includes an inductive element of a resonator. A second surface includes a first portion of a capacitive element of the resonator and at least one qubit. A second portion of the capacitive element of the resonator is on the first surface.