Qubit Coupler-Filter Circuit for Dense Readout Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic circuits with multiple nonlinear elements face challenges in achieving high-density qubit integration due to the need for a large surface area readout resonator, which limits space conservation and qubit density.
Innovation Solution
The electronic circuit incorporates a first coupler with resonators and a filter that couples qubits directly to a readout conductive member, eliminating the need for a separate readout resonator, allowing for high-density qubit integration by using a Purcell filter and transmon resonators for efficient state readout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate readout resonator is used for qubit readout, then readout functionality is achieved, but the surface area increases and qubit density decreases
Solution Approach 1:
The patent combines the readout resonator functionality with the coupler resonator by making them a single integrated component. The coupler resonator serves dual purposes: coupling qubits together and enabling readout of the quantum state, thereby eliminating the need for a separate readout resonator and reducing the overall surface area required for the quantum circuit.
Solution Approach 2:
The coupler resonator is designed to perform multiple functions simultaneously: it acts as a coupling element between qubits and as a readout resonator for measuring quantum states. This multi-functionality allows the system to achieve readout capability without adding extra components, thus maintaining compactness and high qubit density.
2Quantity of substance
If multiple nonlinear elements are integrated for high qubit density, then qubit density improves, but circuit complexity and manufacturing difficulty increase
Solution Approach 1:
The quantum circuit is divided into modular units where each coupler resonator serves as an independent functional block that can be replicated and scaled. This segmentation allows for systematic integration of multiple qubits while maintaining manageable complexity through standardized, reusable coupling and readout modules.
3Area of stationary object
If a compact readout structure is used, then surface area is reduced, but readout error probability may increase
Solution Approach 1:
The patent replaces the traditional mechanical/separate readout resonator structure with an electromagnetic field-based coupled resonator system. The quantum state readout is achieved through electromagnetic coupling between the coupler resonator and measurement apparatus, eliminating the need for physical separation and reducing surface area while maintaining readout fidelity through optimized coupling strength.
Data Source
AI summary
According to one embodiment, an electronic circuit includes a first qubit, a second qubit, a first coupler, a first readout conductive member, and a first filter. The first coupler includes a first resonator and a second resonator. The first resonator is couplable with the first qubit. The second resonator is couplable with the second qubit. The first filter includes a first filter portion, a first other-filter portion, and a first readout portion. The first filter portion is couplable with the first resonator. The first other-filter portion is couplable with the second resonator. The first readout portion is couplable with the first readout conductive member.