Stacked Qubit Layout With Heterogeneous Dielectric Coupling Control

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Solution Overview

Problem

Existing quantum devices face challenges in achieving high integration density while maintaining good detection sensitivity.

Innovation Solution

A quantum electronic device is designed with a substrate coated by semiconductor regions separated by a heterogeneous dielectric region, allowing electrostatic coupling between semiconductor regions on the same axis and preventing coupling between regions on different axes, using superimposed grids for electrostatic control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If detection islands and quantum dots are arranged opposite each other in the same plane to improve detection sensitivity, then detection sensitivity is improved, but integration density is limited due to planar constraints

Engineering Contradiction:

Improvedetection sensitivityVSAvoidintegration density

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration where quantum dots and detection islands are positioned in different planes separated by a dielectric layer. This vertical stacking enables multiple quantum dots to be integrated in the same footprint area while maintaining optimal detection sensitivity through controlled electrostatic coupling across the dielectric barrier.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Quantity of substance

If multiple quantum dots are integrated in a stacked configuration to improve integration density, then integration density is improved, but unwanted electrostatic coupling between non-corresponding quantum dots may occur

Engineering Contradiction:

Improveintegration densityVSAvoidelectrostatic coupling control

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent implements a heterogeneous dielectric region with spatially varying dielectric constant values. By positioning regions of different dielectric constants in specific locations between the stacked quantum dots and detection islands, the design enables strong electrostatic coupling only for vertically aligned quantum dot-detection island pairs, while suppressing unwanted coupling between non-corresponding elements. This local variation in dielectric properties provides precise control over interaction pathways.

Inventive Principle:

Principle #3Local quality

3Reliability

If a heterogeneous dielectric region is introduced to control electrostatic coupling selectively, then electrostatic coupling control is improved, but device complexity increases

Engineering Contradiction:

Improveelectrostatic coupling controlVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The dielectric layer is segmented into distinct regions with different dielectric constants, where each segment serves a specific functional purpose in controlling electrostatic coupling for particular quantum dot-detection island pairs. This segmentation allows independent optimization of coupling strength for different qubit interactions without requiring complete redesign of the entire dielectric structure.

Inventive Principle:

Principle #1Segmentation

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 configuration enhances integration density and maintains detection sensitivity by optimizing electrostatic interactions between quantum dots and detection islands, facilitating efficient quantum information processing.

Implementation Method 1

The heterogeneous dielectric region is configured so as to allow electrostatic coupling between a first semiconductor region among the semiconductor regions of the first set and a given semiconductor region among the semiconductor regions of the first or second set

Methodology Applied

Scientific EffectElectrostatic coupling: Electrostatics

Implementation Method 2

said dielectric region (DR) having a heterogeneous composition

Methodology Applied

Scientific EffectDielectric permittivity: Dielectric Permittivity

Implementation Method 3

the first lower grid (G11) and the first upper grid (GS1) being arranged against, and opposite, respectively the first lower semiconductor region (102L) and the first upper semiconductor region (104L) so as to exert respectively electrostatic control of the first lower semiconductor region and the first upper semiconductor region

Methodology Applied

Scientific EffectElectrostatic control: Electrostatic Induction

Data Source

PatentEP4576992B1Quantum device with stacked qubits and without diagonal coupling

Publication Date: 2026.02.25 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Figure 1~2A
Figure 2B
Figure 3~4

AI summary

Quantum electronic device provided with: - a first set of semiconductor regions (102L, 104L), - a second set of semiconductor regions (102R, 104R), the first set of semiconductor regions (102L, 104L) being arranged opposite the second set of semiconductor regions (102R, 104R), at least one dielectric region (RD) separating the first set of semiconductor regions (102R, 104R) from the second set of semiconductor regions (102R, 104R), said dielectric region (RD) being provided with a heterogeneous composition so as to prevent electrostatic coupling between a first lower semiconductor region (102L) and a second upper semiconductor region (104R), and so as to prevent electrostatic coupling between a first upper semiconductor region (104L) and a second upper semiconductor region (104R), lower semiconductor (102R).