Josephson Ring Modulator Matrix Junctions for High-Saturation Mixing
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Solution Overview
Problem
Josephson ring modulators with a single Josephson junction in each arm are highly nonlinear but can only tolerate low microwave powers, while those with multiple Josephson junctions in each arm are weakly nonlinear but can handle higher powers, necessitating stronger drives for equivalent mixing.
Innovation Solution
A Josephson ring modulator design featuring a matrix of Josephson junctions arranged in series and parallel configurations, allowing for strong nonlinearity while tolerating high microwave powers by optimizing the inductance and flux threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a single Josephson junction is used in each arm of the ring modulator, then strong nonlinearity is achieved, but the device can only tolerate low microwave powers
Solution Approach 1:
The patent divides each arm of the ring modulator into multiple parallel Josephson junctions (e.g., N junctions per arm). This segmentation allows the device to maintain strong nonlinearity through the collective Josephson effect while distributing the microwave power load across multiple junctions, thereby increasing power tolerance. The parallel configuration within each arm creates an equivalent junction with enhanced current-carrying capacity and improved power handling while preserving the nonlinear inductance characteristics needed for mixing operations.
2Reliability
If multiple Josephson junctions are used in each arm of the ring modulator, then high microwave power tolerance is achieved, but weak nonlinearity results requiring stronger drives
Solution Approach 1:
The patent combines multiple Josephson junctions in parallel within each arm to create an equivalent junction that behaves as a single unit with enhanced properties. By merging N junctions in parallel, the device achieves both high power tolerance (through distributed current handling) and strong nonlinearity (through the collective Josephson effect). The parallel combination maintains the nonlinear inductance characteristic while increasing the saturation power capacity by a factor of N compared to a single junction.
3Reliability
If multiple Josephson junctions are used in each arm of the ring modulator, then high microwave power tolerance is achieved, but stronger drives are needed to achieve equivalent mixing
Solution Approach 1:
By merging multiple Josephson junctions in parallel within each arm, the patent creates an equivalent junction with enhanced current-carrying capacity that reduces the drive power requirement. The parallel configuration allows the microwave signal to be distributed across multiple junctions, achieving the same mixing effect with lower individual junction stress and reduced overall drive power needs compared to using fewer, larger junctions.
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 design achieves strong nonlinearity and high-saturation power capabilities, enhancing the performance of Josephson ring modulators in quantum processing applications such as frequency conversion and amplification.
Implementation Method 1
A Josephson ring modulator is a dispersive nonlinear three-wave mixing element. A basic Josephson ring modulator comprises four Josephson arranged in a Wheatstone-bridge configuration.
Implementation Method 2
Matrix junctions of the plurality of matrix junctions can comprise respective superconducting parallel branches that can comprise a plurality of Josephson junctions operatively coupled in a series configuration.
Data Source
AI summary
High-saturation power Josephson ring modulators and fabrication of the same are provided. A Josephson ring modulator can comprise a plurality of matrix junctions. Matrix junctions of the plurality of matrix junctions can comprise respective superconducting parallel branches that can comprise a plurality of Josephson junctions operatively coupled in a series configuration. A method can comprise forming a first matrix junction comprising arranging a first group of Josephson junctions as first parallel branches. The method can also comprise forming a second matrix junction comprising arranging a second group of Josephson junctions as second parallel branches. Further, the method can comprise forming a third matrix junction comprising arranging a third group of Josephson junctions as third parallel branches. In addition, the method can comprise forming a fourth matrix junction comprising arranging a fourth group of Josephson junctions as fourth parallel branches.