Superconducting Resonator Coupling With Impedance Compensation
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Solution Overview
Problem
Existing input/output systems for superconducting quantum processors face challenges in efficiently reading out qubit states and inputting data due to impedance variations in the transmission line, which affect the coupling strength between resonators and the transmission line.
Innovation Solution
The use of an array of superconducting shunt-coupled resonators strongly coupled to a superconducting transmission line, along with the introduction of transmission line inductances to compensate for impedance variations, enables high-speed readout and data input operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If resonators are strongly coupled to the transmission line to achieve high-speed readout, then readout speed is improved, but impedance variations increase causing coupling strength instability
Solution Approach 1:
The patent applies local quality by introducing compensating inductances at specific locations along the transmission line where impedance variations occur due to resonator coupling. Each compensating inductance is strategically placed to counteract the local impedance effect of nearby resonators, thereby maintaining stable coupling strength while preserving strong coupling for high-speed readout.
2Device complexity
If multiple resonators share a common transmission line to achieve scalability, then device complexity is reduced, but impedance variations affect coupling uniformity
Solution Approach 1:
The patent employs parameter changes by introducing compensating inductances with specific inductance values designed to counteract the capacitive effects of resonator coupling to the transmission line. By adjusting these inductance parameters, the overall impedance of the transmission line is maintained at the desired level (e.g., 50 ohms), ensuring uniform coupling strength across all resonators while maintaining system scalability.
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 approach allows for scalable and efficient input/output operations in superconducting quantum processors, mitigating the impact of impedance variations and enhancing the performance of quantum computing systems.
Implementation Method 1
a resonator inductance coupled between the transmission line and the first node via a superconductive path
Implementation Method 2
a coupling capacitance that communicatively couples the superconducting resonator to the transmission line
Implementation Method 3
a first DC superconducting quantum interference device (SQUID) coupled between the resonator inductance and the first node
Implementation Method 4
superconducting quantum interference device (SQUID)
Implementation Method 5
superconducting transmission line, the transmission line comprising at least one transmission line inductance
Data Source
AI summary
A superconducting circuit may include a transmission line having at least one transmission line inductance, a superconducting resonator, and a coupling capacitance that communicatively couples the superconducting resonator to the transmission line. The transmission line inductance may have a value selected to at least partially compensate for a variation in a characteristic impedance of the transmission line, the variation caused at least in part by the coupling capacitance. The coupling capacitance may be distributed along the length of the transmission line. A superconducting circuit may include a transmission line having at least one transmission line capacitance, a superconducting resonator, and a coupling inductance that communicatively couples the superconducting resonator to the transmission line. The transmission line capacitance may be selected to at least partially compensate for a variation in coupling strength between the superconducting resonator and the transmission line.