Air-Bridge Superconducting Coupler for Distant Qubit Connectivity
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Solution Overview
Problem
Existing superconducting qubit connections in quantum computers face challenges in connecting distant qubits efficiently due to limited space and restricted gate driving, limiting the implementation of various quantum computing algorithms.
Innovation Solution
The use of an air-bridge type superconducting coupler with a frequency-fixed resonant frequency between 1 GHz and 10 GHz, comprising a superconducting line and contact pads, formed as a bridge over a substrate with a gap, allowing for efficient connection of distant qubits through an LC resonance circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional planar superconducting qubit connections are used, then manufacturing is simpler, but connectivity between distant qubits is limited and gate driving is restricted
Solution Approach 1:
The patent transitions from a planar two-dimensional connection architecture to a three-dimensional architecture by introducing air-bridge type couplers that extend vertically above the substrate. This dimensional change allows qubits to be connected across greater distances without requiring longer planar transmission lines, thereby improving connectivity while managing structural complexity through vertical utilization of space.
2Adaptability or versatility
If air-bridge type superconducting coupler is used to connect distant qubits, then connectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies optimized parameter ranges for the air-bridge structure, including a bridge gap distance of 5-50 μm and resonant frequency of 1-10 GHz. By establishing these specific parameter ranges, the design balances the need for improved qubit connectivity with practical manufacturing precision capabilities, ensuring that the enhanced adaptability does not come at an unacceptably high cost in manufacturing difficulty.
3Adaptability or versatility
If longer superconducting lines are used to connect distant qubits, then connectivity is improved, but parasitic capacitance increases
Solution Approach 1:
By utilizing the vertical dimension with air-bridge structures, the patent reduces the required length of superconducting transmission lines compared to planar connections. The three-dimensional routing allows qubits to be connected across larger horizontal distances without proportionally increasing the superconducting line length, thereby reducing parasitic capacitance while improving connectivity.
Solution Approach 2:
The air-bridge structure acts as an intermediary element that enables long-distance qubit coupling without requiring equally long superconducting transmission lines. The vertical bridging structure provides an efficient coupling path that minimizes the superconducting line length and associated parasitic capacitance while achieving the desired connectivity between distant qubits.
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 configuration enables efficient arrangement of circuit components, particularly connecting distant qubits, increasing connectivity and enabling the implementation of more quantum computing algorithms, while reducing manufacturing complexity and parasitic capacitance.
Implementation Method 1
The superconducting coupler may be an LC resonance circuit-type coupler
Implementation Method 2
a superconducting line and two contact pads disposed at the respective ends of the superconducting line, the contact pads having respective electrical connections with the respective superconducting qubits
Implementation Method 3
The bridge may be vertically spaced apart from the substrate by a distance between 5 μm and 50 μm and a space between the bottom of the bridge and the top of the substrate is not occupied by solid material
Implementation Method 4
superconducting qubits formed on the substrate; a superconducting coupler comprised of a superconducting line
Data Source
AI summary
An air-bridge type superconducting coupler is provided. A frequency-fixed superconducting coupler includes: a bridge over a substrate, the bridge comprised of superconducting material, the bridge having two ends that each comprise a respective contact pad, each contact pad having an electrical connection to a respectively corresponding superconducting qubit, and each contact pad directly or indirectly contacting the substrate, wherein there is a gap between the substrate and a corresponding portion of the bridge that is between the contact pads.