lattice-patch-transmon-architecture

name	lattice-patch-transmon-architecture
description	Lattice patch structure for fixed-frequency transmon quantum computers enabling high-fidelity CNOT gates while overcoming QCQ architecture limitations.

Lattice Patch Transmon Architecture

Description

Hardware architecture design methodology for fixed-frequency transmon quantum processors using a lattice patch structure that overcomes the physical and structural limitations of conventional qubit-coupler-qubit (QCQ) architectures, enabling high-fidelity CNOT gates with improved scalability.

Activation Keywords

• transmon quantum architecture
• lattice patch structure
• fixed-frequency transmon
• high-fidelity CNOT gate
• superconducting quantum processor
• QCQ architecture alternative
• 超导量子处理器架构
• 晶格补丁transmon

Core Concepts

QCQ Architecture Limitations

• Conventional qubit-coupler-qubit layouts face physical constraints at scale
• Crosstalk increases with qubit density
• Fixed-frequency qubits avoid frequency collisions but limit connectivity

Lattice Patch Design

• Organizes qubits in a lattice pattern with patch-based connectivity
• Each patch provides localized high-fidelity interactions
• Patches can be composed to build larger quantum processors

Fixed-Frequency Advantage

• No frequency tuning needed during operation (reduces noise)
• Simplified control electronics
• Better coherence times compared to tunable qubits

Methodology

Pattern 1: Patch-Based Layout Design

1. Define patch geometry (number of qubits per patch, internal connectivity)
2. Optimize inter-patch connections for target algorithm classes
3. Analyze crosstalk between adjacent patches
4. Verify manufacturability constraints (fabrication tolerances, yield)

Pattern 2: CNOT Gate Optimization

1. Design gate sequence for each patch topology
2. Calibrate cross-resonance or parametric coupling parameters
3. Benchmark gate fidelity against surface code threshold
4. Iterate layout and pulse design for optimal performance

Resources

• arXiv:2606.27017 — "Lattice patch structure for fixed-frequency transmon quantum computer with high-fidelity CNOT gates"