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Hybrid Quantum Computing: Architectures, Algorithms, and Applications

A Comprehensive Educational Framework for the NISQ Era

120 Pages
3 Novel Algorithms
December 2025
Patent AU 2025/2025234266

Author: Amit Bhardwaj, Founder & CTO, Quantonic Legacy Innovations Pty Ltd

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7

Application Domains

Finance, Chemistry, AI/ML, Materials Science, Cryptography, Logistics, Energy/Climate

30%

Gate Reduction

AD-VQE achieves 15-30% fewer two-qubit gates through adaptive circuit depth

60%

Fewer Operations

PO-QAOA delivers 40-60% reduction in entangling operations for photonic hardware

⚛️ Novel Algorithmic Contributions

AD-VQE (Adaptive Depth Variational Quantum Eigensolver)

Gradient-guided circuit depth growth with entanglement entropy analysis. Automatically avoids barren plateaus while maintaining chemical accuracy.

✓ 15-30% fewer two-qubit gates

PO-QAOA (Photonic-Optimised Quantum Approximate Optimization Algorithm)

Connectivity-aware mixer design using XY interactions matching beam splitter networks. Optimised for photonic hardware constraints.

✓ 40-60% fewer entangling operations

HCQ-EM (Hybrid Classical-Quantum Error Mitigation)

Structure-aware mitigation leveraging problem structure. Identifies high-contribution circuit components for selective heavy mitigation.

✓ 2-3× mitigation efficiency improvement

📖 Table of Contents

  • Ch 1: Introduction
  • Ch 2: Background & Fundamentals
  • Ch 3: Hybrid Architectures
  • Ch 4: Algorithms & Software
  • Ch 5: Experimental Results
  • Ch 6: Applications
  • Ch 7: Challenges & Future
  • Ch 8: Conclusion
  • Ch 9: Extended Paradigms & Quantonic Innovations
  • Appendix A: Figures & Diagrams

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