Multi-Junction Qubit Coupling Layout for Lower Stray-Coupling
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Solution Overview
Problem
Higher-order coupling topologies in qubit lattices lead to significant stray-coupling or cross-talk, limiting the implementation of more complex and useful quantum circuits, as existing techniques force neighboring qubits to share coupling elements, thereby increasing unwanted entangling interactions.
Innovation Solution
Implementing multi-junction qubits with additional coupling elements, such as capacitor pads or inductive loops, ensures that each neighboring qubit is coupled to a unique element, reducing stray-coupling by preventing shared coupling elements among neighbors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If higher-order coupling topologies are implemented in qubit lattices, then more complex and useful quantum circuits can be performed, but significant stray-coupling and cross-talk occur between neighboring qubits
Solution Approach 1:
The coupling mechanism is segmented by providing multiple distinct coupling elements (first coupling element, second coupling element, third coupling element) between qubits. Each neighboring qubit couples to a different coupling element of the central qubit, dividing the coupling pathway to prevent shared interaction paths that cause stray-coupling.
Solution Approach 2:
Coupling elements serve as intermediaries between qubits. By introducing these intermediate coupling elements and ensuring each neighboring qubit uses a different one, the direct harmful interaction between neighboring qubits is mediated and isolated through the central qubit's distinct coupling channels.
2Device complexity
If multiple neighboring qubits are coupled to a same coupling element, then device complexity is reduced, but unwanted entangling interactions and cross-talk increase
Solution Approach 1:
The coupling resources are segmented into multiple distinct coupling elements. Instead of sharing a single coupling element among multiple neighboring qubits, each neighboring qubit is assigned a unique coupling element, segmenting the interaction pathways to ensure isolation and prevent cross-talk.
3Object-generated harmful factors
If additional coupling elements are provided on qubits, then stray-coupling is reduced by preventing shared coupling among neighbors, but device complexity increases
Solution Approach 1:
Additional coupling elements are introduced to segment the coupling pathways. Each coupling element serves as a dedicated channel for a specific neighboring qubit interaction, preventing shared coupling paths and the resulting stray-coupling, with each element having a distinct function in the coupling topology.
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 significantly reduces stray-coupling and cross-talk, allowing for higher-order coupling topologies without excessive entangling interactions, enabling more complex quantum circuits while maintaining low levels of unwanted coupling.
Implementation Method 1
a first qubit having a plurality of Josephson junctions respectively between a plurality of capacitor pads
Data Source
AI summary
Systems and techniques that facilitate mitigating stray-coupling via multi junction qubits are provided. In various embodiments, a device can comprise a first qubit having a plurality of Josephson junctions respectively between a plurality of capacitor pads. In various aspects, the device can further comprise a plurality of second qubits respectively coupled to different ones of the plurality of capacitor pads, such that no two of the plurality of second qubits can be coupled to a same one of the plurality of capacitor pads.