Superconducting Coupler Geometry for Higher Quantum Processor Energy Scale
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Solution Overview
Problem
Current quantum processors face limitations in increasing the energy scale without compromising the parameters of superconducting devices, such as coupling devices, which restrict their performance in adiabatic quantum computation and quantum annealing.
Innovation Solution
Intentionally causing crosstalk between superconducting devices by adjusting their inductance and geometry, such as decreasing the loop length and altering the orientation of superconducting devices, to enhance the coupling strength and linearity of the coupler response, thereby increasing the energy scale and tunability of the quantum processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the coupling strength between superconducting devices is increased by adjusting device parameters, then the energy scale of the quantum processor is improved, but the parameters of superconducting devices such as coupling devices are affected and restricted
Solution Approach 1:
The patent introduces a coupling device as an intermediary element that mediates the interaction between superconducting devices. By placing the coupling device in close proximity to the superconducting devices and utilizing its coupled inductance, the system achieves enhanced coupling strength without directly modifying the parameters of the superconducting devices themselves. The coupling device acts as a buffer that transfers and enhances the coupling effect while preserving the original device parameters.
Solution Approach 2:
The patent utilizes parameter changes in the coupling device, specifically its coupled inductance, to control the interaction strength between superconducting devices. By adjusting the inductance parameter of the coupling device, the system can tune the coupling strength and energy scale without affecting the fundamental parameters of the superconducting devices, thus resolving the contradiction between energy scale improvement and parameter flexibility maintenance.
2Measurement precision
If crosstalk is intentionally caused by adjusting inductance and geometry, then the coupling strength and linearity of coupler response are enhanced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making specific portions of the coupling device have different geometric configurations. Specifically, different portions of the coupling device are positioned at different orientations (e.g., perpendicular vs. non-perpendicular) relative to the superconducting devices. This local geometric variation creates controlled crosstalk in specific regions while maintaining overall system manageability, enhancing the linearity of the coupler response without requiring complete structural redesign.
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 effectively increases the energy scale of the quantum processor while improving the linearity of the coupler response, leading to enhanced performance in adiabatic quantum computation and quantum annealing by increasing the coupling strength and tunability of the superconducting devices.
Implementation Method 1
Each of the superconducting devices may be coupled to one or more other superconducting devices by a coupling device. The coupling devices and the superconducting devices may be arranged such that a static coupling is induced between bodies of the superconducting devices.
Implementation Method 2
Current quantum processors face limitations in increasing the energy scale without affecting the parameters of superconducting devices
Implementation Method 3
a first one and a second one of the superconducting device which have respective loops that partially overlaps one another and are not electrically contiguous with one another
Data Source
AI summary
Increasing the energy scale of a quantum processor improves its performance. Energy scale of a quantum processor may be increased by increasing the coupling strength of communicatively coupled superconducting devices comprised in the quantum processor. Configuring the physical dimensions of communicatively coupled superconducting devices such that an intentional direct coupling is induced between a pair of superconducting devices communicatively coupled by a coupling device may controllably add an additional mutual inductance to the mutual inductance of the pair of superconducting devices. Furthermore, reducing the beta parameter of a coupling device may improve the tunability of the coupling device. The combined effects of improved tunability of the coupling devices and the increased coupling strength between superconducting devices communicatively coupled by respective coupling devices comprised in the quantum processor may thus improve the performance of the quantum processor.