Legacy Code

The legacy/ directory at the repository root preserves the original Qutritium codebase from 2023–2024.

What it contains

The original Qiskit Pulse / IBM Quantum-based calibration code:

• calibration/ — Rabi, Ramsey, DRAG, fine-tune, transmission/reflection frequency calibration, 0/1/2 state discrimination
• pulse.py, pulse_creation.py — Pulse model classes and schedule construction via qiskit.pulse.build()
• backend/ — Custom IBMProvider wrapper
• algo_implementation.py — Demo algorithms running on IBM hardware
• tests/ — Original tests for calibration, pulse, and Qiskit API

Why it is archived

Two external changes made this code unrunnable:

1. Qiskit Pulse was removed from the Qiskit SDK in February 2025
2. IBM removed pulse-level access from cloud QPUs on 3 February 2025

Status

• Not installed by pip install qutritium
• Not importable — imports reference deleted Qiskit modules
• Preserved as historical record of the Munich Quantum Software Conference 2023 poster work

For full details, see legacy/README.md.