SQUID-Coupled Non-Reciprocal Bandpass Filter for On-Chip Qubits
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Solution Overview
Problem
Current quantum computing systems face challenges in scaling due to the large form factor and high cost of non-reciprocal components like circulators and isolators, which are traditionally implemented using exotic ferrite materials that cannot be integrated into semiconductor fabrication, limiting their integration with on-chip qubits.
Innovation Solution
A superconducting non-reciprocal bandpass filter is developed using capacitively-coupled shunt resonators with superconducting quantum interference devices (SQUIDs) and flux lines for inductive coupling, enabling on-chip integration and parametric modulation to achieve low transmission loss and high isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ferrite materials are used to implement non-reciprocal components, then non-reciprocal functionality is achieved, but device size and cost increase significantly
Solution Approach 1:
The patent changes the material parameter from ferrite to superconducting materials, and changes the operational parameter from room temperature to cryogenic temperatures. This enables non-reciprocal functionality to be achieved with significantly reduced device size through on-chip integration while maintaining the required isolation and circulation properties
Solution Approach 2:
The patent replaces the mechanical/ferrite-based non-reciprocal components with a superconducting circuit implementation using SQUIDs and Josephson junctions. This substitution enables integration into standard semiconductor fabrication processes and achieves compact on-chip form factors while maintaining non-reciprocal functionality through quantum interference effects
2Reliability
If traditional ferrite materials are used to implement non-reciprocal components, then non-reciprocal functionality is achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive ferrite materials and specialized manufacturing processes with superconducting materials that can be fabricated using standard semiconductor fabrication techniques. This substitution dramatically reduces manufacturing cost while maintaining non-reciprocal functionality through on-chip integration
Solution Approach 2:
The patent changes the manufacturing approach from specialized ferrite processing to standard superconducting circuit fabrication. By operating at cryogenic temperatures and using Josephson junctions, the system achieves non-reciprocal functionality through materials and processes that are more compatible with scalable semiconductor manufacturing
3Reliability
If traditional non-integrated non-reciprocal components are used, then non-reciprocal functionality is provided, but integration with on-chip qubits is limited
Solution Approach 1:
The patent merges the non-reciprocal component functionality directly with the qubit circuit on the same chip. By integrating circulators and isolators into the quantum computing chip using superconducting materials, the system achieves both non-reciprocal functionality and seamless integration with on-chip qubits, enabling scalable quantum computing architectures
Solution Approach 2:
The patent changes the integration parameter from external/off-chip to on-chip integration. By using superconducting materials and cryogenic operation, the system enables direct integration of non-reciprocal components with qubits on the same substrate, dramatically improving adaptability and 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 solution provides a miniaturized, low-cost non-reciprocal bandpass filter with low transmission loss in one direction and high isolation in the reverse direction, facilitating scalable quantum computing architectures.
Implementation Method 1
Prior non-magnetic, cryogenic circulator implementations were based on parametric frequency-conversion and synthetic rotation principles.
Implementation Method 2
Each capacitively-coupled shunt resonators includes a plurality of superconducting quantum interference devices (SQUIDs) connected to each other
Implementation Method 3
Each capacitively-coupled shunt resonators also includes a flux line inductively coupled to the plurality of SQUIDs
Data Source
AI summary
A device for implementing a non-reciprocal bandpass filter is provided. The device includes a plurality of capacitively-coupled shunt resonators. Each capacitively-coupled shunt resonators includes a plurality of superconducting quantum interference devices (SQUIDs) connected to each other, a flux line inductively coupled to the plurality of SQUIDs, and a capacitor connected in parallel to the plurality of SQUIDs.