OpenQASM 2.0 vs OpenQASM 3.0 | Evolution of Quantum Assembly
Quick Technical Answer:
While OpenQASM 2.0 was a static circuit description language without dynamic feedforward, OpenQASM 3.0 is a full-featured hybrid quantum-classical hardware description language with loops, sub-nanosecond timing blocks (defcal), and mid-circuit measurement.
Formula / Unitary:
\text{QASM 2.0: Static DAG} \longrightarrow \text{QASM 3.0: Dynamic Hybrid Control Flow}
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OpenQASM Version Feature Comparison
| Capability | OpenQASM 2.0 (2017) | OpenQASM 3.0 (Modern) |
|---|---|---|
| Classical Control Flow | Single static if (creg == int) | Rich if/else, while, for loops, switch |
| Variable Data Types | qreg, creg only | int, float, bool, bit, angle, complex, arrays |
| Pulse-Level Calibration | None (Gate level only) | Native defcal and defcalgrammar blocks |
| Mid-Circuit Measurement | Basic measurement without feedforward | Dynamic reset, mid-circuit measurement and reuse |
| Timing & Concurrency | Untimed sequence | duration, box [barrier], delay[10ns] |
Frequently Asked Questions
Does Itachi Quantum Studio support both OpenQASM 2.0 and 3.0?
Yes, Itachi provides bidirectional import and export parsing for both OpenQASM 2.0 and OpenQASM 3.0 specifications.