Stacked Superconducting Qubit Memory for Dense Resonator Coupling
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Solution Overview
Problem
Existing superconducting qubit memories in quantum computers face challenges in maximizing memory space utilization, integration, and are susceptible to external noise, with horizontally arranged coplanar waveguide layers occupying large areas and reducing coupling efficiency.
Innovation Solution
The qubit memory design involves vertically stacking superconducting coplanar waveguide layers with insulating and superconductor layers, reducing horizontal area usage and enhancing coupling between layers, while incorporating electromagnetic shielding to mitigate external noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coplanar waveguide layers are horizontally arranged on the same layer, then the structure is simple to manufacture, but the memory space utilization and integration density are reduced
Solution Approach 1:
The patent transitions from horizontal arrangement of coplanar waveguide layers to vertical stacking of multiple layers. This dimensional change from 2D planar layout to 3D stacked architecture increases memory space utilization and integration density while maintaining manufacturing feasibility through sequential layer deposition processes
2Device complexity
If coplanar waveguide layers are horizontally arranged, then the device complexity is low, but the coupling efficiency between layers is reduced
Solution Approach 1:
By stacking waveguide layers vertically in the third dimension, the patent achieves stronger coupling between layers through reduced inter-layer spacing and enhanced electromagnetic field interaction, while the overall structural complexity remains manageable through standardized layer interfaces
Solution Approach 2:
The patent implements nested stacking where multiple waveguide layers are positioned one above another with insulating layers in between, creating a compact vertical structure that enhances coupling efficiency while organizing complex components in a hierarchical manner
3Device complexity
If traditional layered structure is used without additional shielding, then the device complexity is low, but the susceptibility to external noise increases
Solution Approach 1:
The patent introduces electromagnetic shielding layers as intermediary elements between the coplanar waveguide layers and the external environment. These shielding layers act as mediators that block external electromagnetic noise while allowing the waveguide structure to function, with the insulating layers serving as additional intermediary barriers
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 design increases memory space utilization and integration density, strengthens coupling between resonator layers, and improves the quality factor of resonators by reducing external interference.
Implementation Method 1
an insulating layer, and a superconductor layer sequentially stacked on a substrate
Implementation Method 2
a superconductor layer... may cover an entire upper surface of the superconductor layer
Data Source
AI summary
A qubit memory of a quantum computer is provided. The qubit memory according to an embodiment includes a first readout unit, a first transmon, and a first data storage unit storing quantum information, and the first data storage unit includes a first superconducting waveguide layer, an insulating layer, and a superconductor layer sequentially stacked on a substrate. In one example, the first superconducting waveguide layer may include a superconducting resonator.