Module qasm2/ast

OpenQASM 2.0 Abstract Syntax Tree Node Definitions

This module defines the AST node classes for OpenQASM 2.0, which provides a simpler and more limited set of constructs compared to OpenQASM 3.0.

OpenQASM 2.0 focuses on:

Basic quantum register (qreg) and classical register (creg) declarations
Gate definitions and applications
Measurement operations
Simple conditional statements
Basic arithmetic expressions

Key limitations compared to 3.0:

No advanced classical types (only registers)
No control flow structures (loops, complex conditionals)
No function definitions or subroutines
Limited expression capabilities

Example: Basic OpenQASM 2.0 constructs

// Quantum register: qreg q[2];
new QReg('q', 2)

// Gate application: h q[0];
new ApplyGate('h', [['q', 0]], [])

// Measurement: measure q[0] -> c[0];
new Measure('q', 'c', 0, 0)

Classes

ApplyGate
AstNode
Barrier
Cos
CReg
Divide
Exp
Gate
Id
If
Include
Ln
Measure
Minus
NNInteger
Opaque
Pi
Plus
Power
QReg
Real
Sin
Sqrt
Tan
Times
Variable
Version