Superconducting Nonlinear Asymmetric Inductive Element for Noise Isolation
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Solution Overview
Problem
Conventional superconducting quantum information processing systems face challenges with noise reciprocity, where noise from room temperature electronics can interfere with low-temperature qubits, and the integration of non-reciprocal components like ferrites is difficult due to their bulkiness and magnetic field effects.
Innovation Solution
The development of a superconducting nonlinear asymmetric inductive element (SNAIL) with a cubic nonlinearity and no quartic interaction term, integrated into a parametric amplifier configuration, which breaks reciprocity using two SNAILs between couplers to create a low-noise directional amplifier, isolating qubits from noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional superconducting quantum information processing systems are used, then quantum information processing can be performed, but noise from room temperature electronics interferes with low-temperature qubits
Solution Approach 1:
The patent implements non-reciprocal noise isolation using asymmetric couplers with different coupling strengths for forward and reverse directions. The first coupler has a first coupling strength for signals traveling from the qubit to the amplifier, while the second coupler has a second coupling strength for signals traveling in the opposite direction, creating asymmetric noise isolation that protects qubits from room temperature electronics noise.
2Reliability
If non-reciprocal components like ferrites are integrated, then noise isolation can be achieved, but the components are bulky and create magnetic field effects
Solution Approach 1:
The patent replaces bulky ferrite-based non-reciprocal components with superconducting asymmetric couplers that achieve non-reciprocal behavior through differential coupling strengths. This substitution eliminates the need for magnetic field-generating ferrite materials and their associated bulkiness, while maintaining noise isolation functionality in a compact, integrated form factor suitable for quantum circuits.
3Reliability
If asymmetric couplers with different coupling strengths are used, then non-reciprocal noise isolation is achieved, but the coupling strengths must be precisely controlled
Solution Approach 1:
The patent achieves non-reciprocal coupling by adjusting physical parameters of the asymmetric couplers, such as geometric dimensions, capacitor values, or inductor values. By changing these parameters during design and fabrication, the coupling strengths can be precisely controlled to achieve the desired asymmetric coupling behavior without requiring post-fabrication tuning.
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 solution reduces noise interference by creating a non-reciprocal, high-fidelity measurement system that isolates qubits from noise, enhancing the reliability of quantum information processing without relying on magnetic fields, and allows for easier integration into integrated circuits.
Implementation Method 1
a Josephson junction coupled between the two nodes. The Josephson junction is characterized by a superconducting phase difference, φ, and the superconducting device has a potential that varies as a function of the superconducting phase difference, φ
Implementation Method 2
a magnetic flux generation device positioned in proximity to the superconducting ring and configured to generate an external DC magnetic flux through the superconducting ring
Implementation Method 3
Superconducting nonlinear asymmetric inductive element and related systems and methods
Data Source
AI summary
A superconducting device includes two nodes and a Josephson junction coupled between the two nodes, wherein the Josephson junction is characterized by a superconducting phase difference, φ, wherein the superconducting device has a potential that varies as a function of the superconducting phase difference, φ, and has a single potential well. The potential has a non-zero cubic term and quartic term is zero. The Josephson junction may be a single small Josephson junction. The superconducting device may include a superconducting ring connected between the two nodes. The superconducting ring may include a first ring portion with a plurality of large Josephson junctions connected in series. The superconducting ring may also include a second ring portion that includes the single small Josephson junction in parallel with the plurality of large Josephson junctions between the two nodes.