SQUID Tunable Coupler Circuit for High-Impedance Resonator Switching
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Solution Overview
Problem
Existing tunable coupler circuits for superconducting resonator devices require large coupling capacitors and non-tunable inductors, limiting their effectiveness in coupling high impedance resonances and introducing thermal impurities.
Innovation Solution
A tunable coupler circuit utilizing superconducting quantum interference devices (SQUIDs) with shunt SQUIDs to switch between impedance states, allowing for efficient coupling and decoupling of resonator devices without the need for large capacitors, using a control device to adjust flux to set SQUIDs to high or low impedance states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large coupling capacitors and non-tunable inductors are used in existing tunable coupler circuits, then coupling between resonator devices can be achieved, but thermal impurities are introduced and effectiveness in coupling high impedance resonances is limited
Solution Approach 1:
The patent changes the impedance parameter of the SQUID devices dynamically by applying magnetic flux to transition between low-impedance and high-impedance states. This allows the coupler to switch between coupled and decoupled states without requiring large capacitors or non-tunable inductors, thereby eliminating thermal impurities while maintaining coupling effectiveness
Solution Approach 2:
The patent introduces dynamic tunability by using SQUID devices that can switch their impedance state in response to control signals. The coupler transitions from a static design with fixed components to a dynamic design where the coupling strength can be adjusted in real-time, enabling efficient coupling of high impedance resonances without thermal impurities
2Reliability
If large coupling capacitors are used in existing tunable coupler circuits, then coupling between resonator devices can be achieved, but the circuit complexity and device size increase
Solution Approach 1:
The patent uses SQUID devices whose impedance can be changed by applying magnetic flux. By transitioning the SQUID between low-impedance and high-impedance states, the circuit achieves coupling and decoupling functionality without requiring large capacitors, thereby reducing circuit complexity and device size while maintaining coupling efficiency
Solution Approach 2:
The patent replaces the mechanical/electrical approach of using large capacitors for coupling with a quantum-based SQUID device that uses magnetic flux control. This substitution eliminates the need for large physical components while achieving the same coupling function, thereby reducing device complexity
3Reliability
If non-tunable inductors are used in existing tunable coupler circuits, then coupling can be established, but the ability to dynamically control coupling rates is limited
Solution Approach 1:
The patent replaces non-tunable inductors with SQUID devices that can dynamically change their inductance by applying magnetic flux. This allows the coupling rate to be tuned in real-time between coupled and decoupled states, providing both coupling stability when needed and dynamic adaptability when required
Solution Approach 2:
The SQUID device serves multiple functions: it acts as a tunable inductor for coupling, a switch for decoupling, and a controllable element for adjusting coupling rates. This multi-functionality replaces the need for separate non-tunable inductors and control mechanisms, achieving both stability and adaptability
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
Enables efficient and thermally stable coupling and decoupling of resonator devices with reduced thermal impurities and smaller capacitors, facilitating precise control over coupling rates.
Implementation Method 1
a coupling superconductor quantum interference device (SQUID) having a first end configured to be coupled to a first resonator device through a first coupling node and a second end configured to be coupled to a second resonator device through a second coupling node
Implementation Method 2
a first shunt SQUID coupled between the first coupling node and ground, and a second shunt SQUID coupled between the second coupling node and ground
Data Source
AI summary
A tunable coupler circuit is provided that includes a coupling superconductor quantum interference device (SQUID) having a first end configured to be coupled to a first resonator device and a second end configured to be coupled to a second resonator device. A first shunt SQUID coupled between the first coupling node and ground, and a second shunt SQUID coupled between the second coupling node and ground, wherein the tunable coupler circuit is configured to switch between a coupled state by the setting of the coupling SQUID to a low impedance state while concurrently setting the first shunt SQUID and the second shunt SQUID to a high impedance state and a decoupled state by setting the coupling SQUID to a high impedance state to decouple the first resonator device and the second resonator device while concurrently setting the first shunt SQUID and the second shunt SQUID to a low impedance state.