Josephson Parametric Ports With Single-Generator Pump Coupling
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Solution Overview
Problem
Existing Josephson parametric devices require multiple pump tone sources and phase-coherent generators, leading to complex circuitry and increased space requirements in quantum computing systems, particularly in qubit readout applications.
Innovation Solution
Designing Josephson parametric devices with same-frequency ports that utilize passive and parametric couplings, allowing for simplified circuitry and reduced hardware footprint by using a single signal generator for multiple couplings, and incorporating additional resonant modes for improved bandwidth and coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple pump tone sources and phase-coherent generators are used in Josephson parametric devices, then device functionality is achieved, but circuitry complexity and space requirements increase
Solution Approach 1:
The patent combines multiple pump tone sources into a single signal generator that produces multiple pump tones through parametric coupling. This merging approach reduces the number of separate components while maintaining the necessary device functionality, directly addressing the contradiction between circuitry complexity and device functionality
Solution Approach 2:
A single signal generator is designed to perform multiple functions by generating multiple pump tones simultaneously. This multi-functional approach eliminates the need for separate pump tone sources, reducing circuitry complexity while preserving all required device operations
2Area of stationary object
If multiple pump tone sources are used, then parametric coupling is achieved, but hardware footprint increases
Solution Approach 1:
Multiple pump tone generation capabilities are merged into a single signal generator unit, significantly reducing the hardware footprint while maintaining full parametric coupling capability. This consolidation achieves the same functional result with compact hardware
Solution Approach 2:
The patent implements a nested structure where multiple pump tones are generated within a single signal generator framework. The signal generator contains nested functional elements that produce different pump tones, allowing compact hardware implementation while preserving adaptability for various parametric coupling configurations
3Productivity
If same-frequency ports are used, then bandwidth is improved, but resonant mode configuration becomes more complex
Solution Approach 1:
The patent employs dynamic frequency tuning of resonant modes to achieve same-frequency ports. By dynamically adjusting the resonant frequencies of different modes, the system achieves enhanced bandwidth while managing configuration complexity through active control rather than fixed static design
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
Enhances qubit readout performance with improved gain and reduced noise, while minimizing the cryogenic space requirements and hardware complexity in quantum computing systems.
Implementation Method 1
Josephson parametric devices having same frequency ports
Data Source
AI summary
A Josephson parametric device (e.g., a circulator/isolator or directional amplifier) can include a plurality of resonant modes, a plurality of couplings, an input port and an output port. The plurality of resonant modes includes first, second, and third resonant modes, the first and third resonant modes both configured to operate at a first resonant frequency and the second resonant mode configured to operate at a second resonant frequency that is different than the first resonant frequency. The plurality of couplings includes a passive coupling between the first and third resonant modes, a first parametric coupling between the first and second resonant modes, and a second parametric coupling between the second and third resonant modes. The input port is coupled to the first resonant mode of the device, and the output port is coupled to the third resonant mode of the device.