Integrated Drive Readout Circuit for Superconducting Qubits
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Solution Overview
Problem
Superconducting qubits are sensitive to electromagnetic noise, particularly in microwave and infrared domains, requiring multiple layers of filtering and isolation, which complicates the design of integrated drive and readout circuits with a minimum number of input and output transmission lines and components.
Innovation Solution
An integrated drive and readout circuit assembly that includes directional couplers, diplexers, and a microwave signal combiner, minimizing the number of circulators and isolators, and allowing for simultaneous driving and reading of qubit-resonator systems with reduced noise propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple layers of filtering and isolation are applied to protect superconducting qubits from electromagnetic noise, then the noise protection is improved, but the device complexity increases
Solution Approach 1:
The patent combines drive and readout functions into a single integrated circuit assembly, merging multiple transmission lines and components into one unified structure. This integration reduces the overall number of components while maintaining the necessary filtering and isolation functions for noise protection.
Solution Approach 2:
The integrated circuit assembly performs multiple functions simultaneously - driving qubits, reading out qubit states, filtering electromagnetic noise, and providing thermal isolation - all within a single compact structure. This multi-functionality eliminates the need for separate dedicated components for each function.
2Object-affected harmful factors
If multiple layers of filtering and isolation are applied to protect superconducting qubits from electromagnetic noise, then the noise protection is improved, but the device size increases
Solution Approach 1:
The patent merges multiple filtering stages, isolation layers, and transmission lines into a single integrated circuit assembly with a compact footprint. This consolidation achieves the same noise protection volume as distributed components would require.
Solution Approach 2:
The integrated circuit employs nested filtering structures where multiple filtering layers are arranged concentrically or in nested configurations, allowing multiple protection layers to occupy minimal space while maintaining their individual filtering functions.
3Object-affected harmful factors
If multiple layers of filtering and isolation are applied to protect superconducting qubits from electromagnetic noise, then the noise protection is improved, but the weight increases
Solution Approach 1:
The patent combines multiple filtering and isolation components into a single integrated assembly, eliminating redundant structural support and mounting hardware that would be required for distributed components, thereby reducing overall weight.
Solution Approach 2:
The integrated circuit employs composite superconducting materials and lightweight structural designs that provide the necessary electromagnetic shielding and thermal isolation properties with minimal mass, replacing traditional heavy metallic shielding and isolation structures.
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 the complexity and size of the circuitry, achieving a lighter weight and smaller footprint while maintaining low insertion loss, thus protecting qubits from noise and enabling efficient operation.
Implementation Method 1
transmitting, by directional couplers, microwave signals to the qubit-resonator systems, receiving back, by the directional couplers, the microwave signals having been reflected from the qubit-resonator systems
Implementation Method 2
The diplexers are configured to direct the microwave signals to a termination
Implementation Method 3
The microwave signal combiner is configured to combine the microwave signals into combined microwave signals
Implementation Method 4
The electromagnetic energy associated with the qubit is stored in the Josephson junctions and in the capacitive and inductive elements forming the qubit
Implementation Method 5
a microwave signal is applied to the microwave readout cavity that couples to the qubit at the cavity frequency corresponding to the qubit state
Data Source
AI summary
Embodiments of the present invention are directed to an integrated drive and readout circuit assembly. Directional couplers are configured to connect to qubit-resonator systems. Diplexers are coupled to the directional couplers. A microwave signal combiner is coupled to the diplexers.