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qiskit-noise
NISQ noise characterization via quantum image encoding.
Contents
quantum_image_20260124_221920.json— 4x4 image encoding through identity, compression, and deep circuits
Experiment
4x4 images (plus, X, gradient, checkerboard) encoded into 4-qubit amplitudes via StatePreparation. Three circuit types tested:
- Identity: encode → measure (baseline noise)
- Compress: entangling circuit (information scrambling)
- Deep: 50+ gate circuit that is mathematically identity (noise accumulation)
Key Results
| Circuit | Mean Fidelity | Mechanism |
|---|---|---|
| Identity | 0.957 | State preparation + measurement error |
| Compress | 0.399 | Entanglement destroys local information |
| Deep | 0.812 | Gate errors compound: (0.995)^50 ≈ 0.78 |
Finding
NISQ artifacts differ from classical compression:
- JPEG: deterministic blockiness
- NISQ: probabilistic amplitude leakage between basis states
Hardware
IBM Quantum ibm_torino. 15 seconds QPU time.
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