Free SKILL.md scraped from GitHub. Clone the repo or copy the file directly into your Claude Code skills directory.
npx versuz@latest install hiyenwong-ai-collection-collection-skills-bistable-qubit-fpgagit clone https://github.com/hiyenwong/ai_collection.gitcp ai_collection/SKILL.MD ~/.claude/skills/hiyenwong-ai-collection-collection-skills-bistable-qubit-fpga/SKILL.md--- name: bistable-qubit-fpga description: "Operating bistable qubits using FPGA-based 1-bit adaptive feedback control. Use when: mitigating TLS-induced dephasing errors in superconducting qubits, designing adaptive qubit control protocols, implementing real-time qubit frequency tracking, or stabilizing gate fidelities against discrete instabilities." --- # Bistable Qubit FPGA Control Skill Operating bistable qubits with FPGA-based adaptive feedback to mitigate two-level-system (TLS) defect-induced dephasing errors in solid-state quantum processors. ## Source Paper: "Operating a bistable qubit" (arXiv: 2605.03187) Category: quant-ph Published: 2026-05 ## Core Problem Parasitic two-level-system (TLS) defects cause discrete, stochastic frequency shifts in superconducting qubits, making them bistable. This induces Ramsey beating and degrades gate fidelities over time. ## Key Technique: 1-Bit Feedback Protocol ### Principle - Estimate the qubit's bistable frequency from a **single single-shot measurement** - Reach the information limit set by the qubit's intrinsic entropy - Deploy a classical FPGA controller for real-time adaptive correction ### Performance - **Estimation bandwidth**: ~136 kHz - **Error reduction**: 77% - **Gate fidelity**: Stabilized over time with high fidelity ### Implementation Steps 1. **Single-shot measurement**: Perform one measurement to estimate current bistable state 2. **FPGA-based controller**: Use FPGA for real-time frequency estimation and correction 3. **Adaptive protocol**: Dynamically adjust control parameters based on estimated state 4. **Ramsey beating suppression**: Apply correction to suppress TLS-induced dephasing ## Applications - Superconducting qubit operation with TLS defects - Large-scale qubit array stabilization - Real-time qubit frequency tracking - Gate fidelity maintenance over time ## Key Insights - Simple yet fundamentally efficient strategy for TLS-induced dephasing - May enable operation of large future qubit arrays with discrete instabilities - Reaches information-theoretic limit with minimal measurement overhead ## Activation Keywords - bistable qubit, TLS defect, FPGA feedback, adaptive qubit control, dephasing mitigation, superconducting qubit stability, Ramsey beating suppression