Qubit Lattice Design Reduces Frequency Collisions
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Solution Overview
Problem
Conventional quantum computer architectures with a two-dimensional grid arrangement of qubits often experience frequency collisions due to imperfections in fabrication, leading to reduced functionality and 'holes' in the lattice, as qubits have four potential frequency collisions with their neighbors, increasing the likelihood of useless qubits.
Innovation Solution
Arranging qubits in non-traditional lattice geometries such as hexagons, dodecagons, or octagons, where qubits are positioned on vertices and coupling qubits are on edges, reducing the number of connections between qubits and thereby minimizing frequency collisions by limiting direct connections to three or fewer qubits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If qubits are arranged in a conventional two-dimensional grid architecture, then connectivity between qubits is maximized, but frequency collisions increase due to four potential collisions with neighboring qubits
Solution Approach 1:
The patent transitions from a conventional two-dimensional square grid to a three-dimensional lattice structure where qubits are positioned at vertices of polyhedral cells (tetrahedra, octahedra, cubes). This dimensional extension allows each qubit to connect to fewer neighboring qubits (reducing frequency collision probability) while maintaining system connectivity through the three-dimensional arrangement and coupling mechanisms.
Solution Approach 2:
The patent introduces coupling qubits as intermediary elements between target qubits, creating localized connection pathways. This local quality differentiation allows direct connections to be limited to three or fewer qubits (reducing collisions) while still enabling logical operations through the intermediary coupling qubits, thus resolving the contradiction between connectivity and collision probability.
2Adaptability or versatility
If qubits are arranged with four neighboring connections in a grid, then operational versatility is improved, but the number of useless qubits increases due to frequency collisions
Solution Approach 1:
The patent introduces coupling qubits as intermediary elements positioned between target qubits. These coupling qubits enable logical operations between target qubits without requiring direct connection, thereby reducing frequency collisions that would otherwise render qubits useless. The intermediary coupling qubit transfers quantum information between target qubits, maintaining operational capability while avoiding harmful frequency collisions.
Solution Approach 2:
The patent segments the qubit connection function into two distinct roles: target qubits (positioned at vertices) and coupling qubits (positioned on edges or as intermediaries). This segmentation allows the system to separate the function of quantum information storage (target qubits) from the function of quantum information transfer (coupling qubits), thereby reducing frequency collisions between target qubits while maintaining logical operations capability.
Data Source
AI summary
Lattice arrangements for quantum qubits are described. A lattice arrangement can comprise adjacent structures having vertices connected by edges. The qubits can be positioned on the vertices. A qubit in the lattice arrangement directly connects to not more than three other qubits, or connects to another qubit via a coupling qubit on an edge between two qubits on a vertex. The adjacent structures can comprise hexagons, dodecagons or octagons. A superconducting qubit lattice can comprise superconducting target qubits and superconducting control qubits. The superconducting qubit lattice can comprise adjacent structures having vertices connected by edges, with target qubits positioned on the vertices and control qubits positioned on the edges. Logic operations between adjacent superconducting target and control qubits can be implemented by driving the superconducting control qubit at or near the frequency of the superconducting target qubit.