fluxonium-scalable-architecture

name	fluxonium-scalable-architecture
description	Scalable fluxonium quantum processor architecture using tunable-coupler unit cells. Achieves 99.9% CZ gate fidelity and demonstrates 22-qubit GHZ state generation. Alternative to transmon-based superconducting quantum computers. Keywords: fluxonium, superconducting qubits, tunable coupler, scalable quantum processor, CZ gate, high fidelity, quantum hardware.

Fluxonium Scalable Architecture

Scalable fluxonium quantum processor architecture based on modular qubit-coupler unit cells with demonstrated high-fidelity operations.

Core Concepts

Fluxonium Advantages

• Intrinsic Error Protection: Alternative to transmon with better protection
• Scalability: Modular unit cell design
• High Fidelity: 99.9% two-qubit gate fidelity achieved

Architecture

• Unit Cell: Modular qubit-coupler design
• Tunable Coupler: Mediates interactions between fluxonium qubits
• Lattice: Composable many-qubit architecture

Technical Specifications

Single-Qubit Gates

• Fidelity: Approaching 99.99%
• Operation: Parallel execution supported

Two-Qubit Gates (CZ)

• Fidelity: ~99% (average), 99.9% (best)
• Gate Duration: 32 ns (optimized)
• Type: CZ (controlled-Z) gate

System Scale

• Demonstrated: 22-qubit processor
• GHZ States: Up to 10 qubits deterministically generated

Key Features

Suppressed Interactions

• Residual interactions minimized
• Spectator errors suppressed
• Clean composition of unit cells

Scalability Validation

• 22-qubit processor demonstration
• No emergent interaction pathologies
• Parallel operations enabled

Workflow

Step 1: Qubit Initialization

Initialize fluxonium qubits in lattice

Step 2: Single-Qubit Operations

Apply parallel single-qubit gates with high fidelity

Step 3: Two-Qubit Operations

Execute CZ gates via tunable coupler

Step 4: Multi-Qubit Operations

Generate entangled states (GHZ, etc.)

Applications

Quantum Simulation

• Many-body physics
• Lattice models
• Quantum chemistry

Quantum Computing

• NISQ algorithms
• Error correction codes
• Quantum machine learning

Benchmarking

• GHZ state generation
• Entanglement verification
• Fidelity characterization

Comparison: Fluxonium vs Transmon

Feature	Fluxonium	Transmon
Error Protection	High	Moderate
Gate Fidelity	99.9% CZ	~99% typical
Scalability	Demonstrated	Established
Architecture	Modular unit cell	Various

References

• Paper: arXiv:2604.13363 - "Scalable Fluxonium Quantum Processors via Tunable-Coupler Architecture"
• Category: Quantum Hardware / Superconducting Qubits

Related Skills

• superconducting-quantum-computing
• quantum-hardware-design
• quantum-gate-calibration