Superconducting Parametric Interferometer for Broadband Isolation
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Solution Overview
Problem
Ferrite-based microwave isolators in quantum computing systems are bulky, require significant shielding, and cause loss, posing limitations to system scaling and integration as quantum computing systems grow in size and complexity.
Innovation Solution
Implementing superconducting parametric interferometer circuits with parallel parametric mixing circuits to provide broadband isolation and directional amplification, utilizing components like hybrid couplers and parametric frequency converters, which operate in a continuous wave mode to replace ferrite-based devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrite-based microwave isolators are used in quantum computing systems, then isolation function is provided, but device size and complexity increase
Solution Approach 1:
The patent replaces ferrite-based mechanical/magnetic isolation devices with a superconducting electronic circuit implementation. The interferometric isolator uses superconducting qubits, Josephson junctions, and microwave resonators to achieve isolation through quantum interference effects rather than ferrite magnetic properties, thereby reducing device size and eliminating the need for bulky magnetic shielding.
Solution Approach 2:
The patent changes the operating parameters from ferrite materials requiring magnetic fields to superconducting circuits operating at cryogenic temperatures. By transitioning to the superconducting regime and using quantum interference principles, the isolation function is achieved with significantly reduced physical dimensions and without requiring magnetic shielding.
2Reliability
If ferrite-based microwave isolators are used in quantum computing systems, then isolation function is provided, but shielding requirements increase
Solution Approach 1:
The patent eliminates the need for magnetic shielding by replacing ferrite-based isolators with superconducting circuit-based isolators. The superconducting interferometric isolator achieves isolation through quantum interference and circuit design rather than magnetic field effects, removing the requirement for magnetic shielding entirely.
3Reliability
If ferrite-based microwave isolators are used in quantum computing systems, then isolation function is provided, but signal loss increases
Solution Approach 1:
The patent changes the material regime from lossy ferrite materials to lossless superconducting materials operating at cryogenic temperatures. The superconducting interferometric isolator utilizes the zero-resistance property of superconductors and quantum interference to achieve isolation with minimal signal loss, unlike ferrite-based isolators that inherently introduce significant insertion loss.
4Productivity
If quantum computing systems scale in size, then processing capability increases, but integration with ferrite-based isolators becomes difficult
Solution Approach 1:
The patent creates a universal superconducting interferometric isolator design that can be integrated into any superconducting quantum computing system regardless of scale. The circuit-based implementation using standard superconducting components (qubits, Josephson junctions, resonators) allows the isolator to be scaled and integrated alongside other quantum components without the integration difficulties associated with bulky ferrite devices.
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 broadband isolation and directional amplification in qubit readout signal chains, enhancing signal fidelity and reducing system size and complexity while minimizing noise interference.
Implementation Method 1
The first parametric mixing circuit is configured to convert the input signal to a first output signal having a second frequency, and the second parametric mixing circuit is configured to convert the input signal to a second output signal having the second frequency
Implementation Method 2
The superconducting parametric interferometric circuit is configured to constructively combine the first output signal and the second output signal at the signal output port to generate an output signal having the second frequency
Implementation Method 3
the superconducting parametric interferometric circuit comprises an interferometric isolator circuit which is configured to provide unity gain of the output signal, and to provide isolation by dissipating the signal which is present at the signal output port, in a terminated port of the superconducting parametric interferometric circuit
Data Source
AI summary
A device comprises a superconducting parametric interferometric circuit, which comprises a signal input port and a signal output port, and a first parametric mixing circuit and a second parametric mixing circuit coupled in parallel between the signal input port and the signal output port. The signal input port configured to receive an input signal having a first frequency. The first parametric mixing circuit is configured to convert the input signal to a first output signal having a second frequency, and the second parametric mixing circuit is configured to convert the input signal to a second output signal having the second frequency. The superconducting parametric interferometric circuit is configured to constructively combine the first and second output signals at the signal output port to generate an output signal having the second frequency, and provide isolation of the signal input port from a signal which is present at the signal output port.