Superconducting Qubit Insulation With an Artificial Magnetic Conductor
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Solution Overview
Problem
Existing superconducting qubit designs face challenges in scaling and industrialization due to strict dimensional requirements and manufacturing difficulties, particularly with the use of welded boxes and narrow tunnels, which cause resistive losses and limit quantum state lifetime, while also being unsuitable for coupling with external devices for measurements and quantum gates.
Innovation Solution
An electromagnetically insulated superconducting qubit device utilizing an electrical conductor and an artificial magnetic conductor with a specific arrangement of projections to create an electromagnetic band gap structure, protecting qubits from radiation losses and enabling scalable manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a welded box structure is used for electromagnetic insulation, then electromagnetic protection is achieved, but resistive losses at the weld interface severely limit quantum state lifetime
Solution Approach 1:
The invention divides the electromagnetic insulation structure into two separate parts: an electrical conductor and an artificial magnetic conductor. This segmentation eliminates the need for welding while maintaining electromagnetic band gap protection, thereby avoiding resistive losses at weld interfaces and preserving quantum state lifetime.
Solution Approach 2:
The invention uses a composite structure combining electrical conductor and artificial magnetic conductor materials. This composite approach creates an electromagnetic band gap that provides protection without requiring metallic welds, thus avoiding the resistive losses that limit quantum state lifetime in traditional welded box structures.
2Object-affected harmful factors
If narrow tunnels are drilled through superconducting bulk to form cavities, then electromagnetic insulation is achieved, but manufacturing difficulties and strict dimensional requirements arise
Solution Approach 1:
The invention segments the insulation structure into two separate conductors with planar faces, eliminating the need to drill narrow tunnels through bulk superconducting material. This segmentation simplifies manufacturing by avoiding strict dimensional requirements for tunnel cross-sections while maintaining electromagnetic band gap protection.
Solution Approach 2:
The invention transitions from a three-dimensional tunnel structure (requiring narrow cross-sections) to a two-dimensional planar interface structure. By creating artificial magnetic conductors with projections facing an electrical conductor, the solution eliminates the manufacturing difficulties associated with drilling and dimensioning narrow tunnels while achieving the same electromagnetic insulation effect.
3Object-affected harmful factors
If the box size is reduced to meet dimensional requirements for electromagnetic insulation, then electromagnetic protection is maintained, but scalability to multiple qubits is limited
Solution Approach 1:
The invention segments the electromagnetic insulation into separate electrical and magnetic conductor components that can be independently sized and configured. This allows the overall structure to be expanded to accommodate multiple qubits while maintaining the electromagnetic band gap protection through the artificial magnetic conductor projections.
Solution Approach 2:
By transitioning from a constrained three-dimensional tunnel structure to a two-dimensional planar interface with projections, the invention enables horizontal scaling to accommodate multiple qubits. The artificial magnetic conductor structure allows the device footprint to be expanded without being limited by tunnel cross-section dimensions, thereby improving scalability.
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
The device provides effective electromagnetic insulation for superconducting qubits, allowing for scalable and industrialized production by minimizing radiation losses and facilitating coupling with external devices for measurements and quantum gates.
Implementation Method 1
the dimensions of the elements making the artificial magnetic conductor and the distance separating the face of said electrical conductor and the face of said artificial magnetic conductor being chosen so as to make an electromagnetic band gap structure which comprises the frequencies of said qubits
Implementation Method 2
some of the most advanced real-world implementations of qubits are based on the use of superconducting circuits
Data Source
AI summary
An electromagnetically insulated superconducting qubit device comprising an electrical conductor having a substantially planar face and an artificial magnetic conductor having a substantially planar face facing the face of said electrical conductor, and one or more qubits made on or in one of said electrical conductor and said artificial magnetic conductor, the dimensions of the constituent elements of the artificial magnetic conductor and the distance separating the face of said electrical conductor and the face of said artificial magnetic conductor being chosen so as to make an electromagnetic band gap structure which comprises the frequencies of said qubits.