Advanced Multi-Qubit Gate Library

[Subh37106]

🚀 Advanced Multi-Qubit Gate Library

Overview

Expand the current gate library with essential multi-qubit operations needed for real quantum algorithms like Grover's search and Shor's algorithm.

Current State

The simulator has basic single and two-qubit gates but lacks advanced multi-qubit operations required for sophisticated quantum algorithms.

Implementation Tasks

Core Gates (C++)

• Toffoli Gate (CCX) - Double-controlled X gate
• Fredkin Gate (CSWAP) - Controlled SWAP gate
• Multi-controlled X/Z gates - Variable number of controls
• Quantum Fourier Transform (QFT) - Both primitive and decomposed versions

File Extensions qubitverse/simulator/gates/ ├── gates.hh # Extend with new declarations ├── gates.cc # Extend with implementations

├── advanced_gates.hh # New - advanced gate declarations └── advanced_gates.cc # New - advanced gate implementations

Integration Points

• Extend parser (lexer/parser/) for new gate syntax
• Update visualizer (visualizer/src/components/) for gate display
• Add CMake build configuration
• Follow existing .clang-format style guidelines

Success Criteria

• All gates pass numerical precision tests (< 1e-12 error)
• Implement Grover's algorithm as validation
• Complete API documentation
• Seamless parser/visualizer integration

Technical Approach

// Example API extension
namespace qubitverse {
    void toffoli(QuantumState& state, int ctrl1, int ctrl2, int target);
    void qft(QuantumState& state, const std::vector<int>& qubits);
}

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊

[Dark-CodeX]

@Subh37106 That's a great idea, I've assigned you this particular issue, worth 2x stars of 5/5 difficulty issue.