Josephson LC Coupler for Tunable Nonlinear Resonator Coupling
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Solution Overview
Problem
Existing calculating devices with couplers that utilize only inductors face challenges in achieving high controllability and strong coupling strength between nonlinear resonators, particularly in modulating resonant frequencies and coupling strengths effectively.
Innovation Solution
Incorporating capacitors into the coupler design, specifically configuring LC circuits with Josephson junctions and capacitors to create a coupler that can modulate magnetic flux, allowing for reduced resonant frequencies and strong coupling strength, enabling precise control of coupling between nonlinear resonators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only inductors are used in the coupler design, then the device complexity is reduced, but the controllability and coupling strength between nonlinear resonators deteriorate
Solution Approach 1:
The patent combines inductors and capacitors into an LC circuit configuration within the coupler, merging two passive components to achieve both reduced complexity (compared to active devices) and improved controllability through adjustable resonant frequencies and coupling strengths
Solution Approach 2:
The patent enables parameter changes by adjusting the resonant frequencies of the LC circuits and modifying the coupling strength between resonators, allowing dynamic control of the system's operational characteristics without changing the physical structure
2Ease of manufacture
If only inductors are used in the coupler design, then the manufacturing is simpler, but the coupling strength between nonlinear resonators becomes weak
Solution Approach 1:
The patent merges inductors and capacitors into LC resonant circuits that provide strong coupling between nonlinear resonators while maintaining passive component simplicity for ease of manufacture
Solution Approach 2:
The patent utilizes electromagnetic resonance (analogous to mechanical vibration) in the LC circuits to enhance coupling strength between resonators through resonant frequency matching, achieving strong interaction without complex active components
3Adaptability or versatility
If LC circuits with Josephson junctions are incorporated, then the controllability and coupling strength are improved, but the device complexity increases
Solution Approach 1:
The patent makes the LC circuits with Josephson junctions serve multiple functions: frequency modulation, coupling strength control, and quantum state manipulation, reducing the need for separate dedicated components and thereby limiting the increase in overall device complexity
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 enhances controllability by allowing for adjustable coupling strength, including the ability to decouple resonators, and facilitates efficient two-qubit gate operations with improved stability and speed.
Implementation Method 1
a first Josephson junction including a first Josephson junction end portion and a first Josephson junction other-end portion. The first Josephson junction end portion is electrically connected with the first capacitor end portion. The first Josephson junction other-end portion is electrically connected with the second capacitor end portion
Data Source
AI summary
According to one embodiment, a coupler includes first to fourth capacitors, first and second inductors, and a first Josephson junction. The first capacitor includes a first capacitor end portion and a first capacitor other-end portion. The first inductor includes a first inductor end portion, and a first inductor other-end portion. The second inductor includes a second inductor end portion, and a second inductor other-end portion. The first Josephson junction includes a first Josephson junction end portion, and a first Josephson junction other-end portion. A space is surrounded with the first inductor, the second inductor, and the first Josephson junction. The third capacitor includes a third capacitor end portion, and a third capacitor other-end portion. The fourth capacitor includes a fourth capacitor end portion, and a fourth capacitor other-end portion.