3D Quantum Processor Topology for Qubit Density and Connectivity
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Solution Overview
Problem
Two-dimensional quantum computing architectures face challenges with qubit density and connectivity, leading to frequency crowding and reduced performance due to limited spatial arrangements and interconnect complexity.
Innovation Solution
A three-dimensional integrated multilayer architecture with a tree structure topology, where qubits are arranged across multiple layers with through-vias for vertical connections, enabling denser qubit-qubit coupling and indirect coupling through ancilla qubits and resonator buses, reducing fabrication complexity and noise sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If qubits are arranged in a two-dimensional architecture with neighboring connections, then the device structure is simple and fabrication is easier, but qubit density is limited and connectivity is restricted leading to frequency crowding
Solution Approach 1:
The patent transitions from a two-dimensional qubit arrangement to a three-dimensional architecture by stacking multiple layers of qubits vertically. Through-vias connect qubits across layers, enabling spatial separation of qubits while maintaining connectivity. This dimensional change increases qubit density without requiring more planar space, thereby avoiding frequency crowding while preserving fabrication feasibility through modular layer construction.
2Device complexity
If qubits are arranged in a two-dimensional architecture with neighboring connections, then the device structure is simple, but connectivity between qubits is limited leading to increased interconnect complexity
Solution Approach 1:
By adding the vertical dimension through multiple stacked layers, the patent enables qubits to connect with any other qubit in the system through through-vias, transforming the connectivity from limited nearest-neighbor interactions to all-to-all potential connections. This maintains relatively simple device structures within each layer while dramatically increasing overall system connectivity and adaptability.
Solution Approach 2:
The patent introduces ancilla qubits as intermediary elements that facilitate coupling between computational qubits across different layers. These ancilla qubits act as mediators, enabling indirect coupling between qubits that would otherwise require direct physical connections, thereby simplifying the overall interconnect structure while maintaining high connectivity.
3Quantity of substance
If qubits are densely packed in a two-dimensional arrangement, then qubit density increases, but frequency crowding occurs reducing performance
Solution Approach 1:
The patent resolves frequency crowding by distributing qubits across multiple vertical layers rather than packing them densely in a single two-dimensional plane. This spatial separation in the vertical dimension allows each qubit to operate at its optimal frequency without interference from neighboring qubits, maintaining high qubit density while preserving quantum performance and coherence.
4Quantity of substance
If through-vias are used for vertical connections between layers, then qubit density and connectivity increase, but fabrication complexity increases
Solution Approach 1:
The patent divides the quantum processor into separate stacked layers, each fabricated independently using standard planar fabrication techniques. The through-vias are formed as distinct structural elements that connect these pre-fabricated layers. This segmentation allows each layer to be manufactured with relatively simple processes, and the overall three-dimensional structure is assembled by stacking and connecting these modular units, reducing overall fabrication complexity.
Data Source
AI summary
In a general aspect, three-dimensional integrated multilayer architectures for qubit devices organized in quantum processors are described herein. In some aspects, a quantum processor includes devices residing in multiple physical layers. The quantum processor also includes connections that interconnect the devices in a tree structure topology. A computational state is encoded in child qubit devices in a first layer of the tree structure topology. A quantum control sequence is applied to at least one of the devices to transform the computational state. Applying the quantum control sequence includes using one or more parent qubit devices in a second layer of the tree structure topology to mediate between child qubit devices in the first layer of the tree structure topology. A readout of the transformed computational state may be performed.