OpenQASM 3 language features

Below is a list of the OpenQASM 3 language features, separated into basic OpenQASM 3 language features.

For more details on these capabilities, see the OpenQASM 3.X Live Specification .

Key:

  • ❌ Not supported

  • 🟡 Partial support

  • ✅ Supported

Feature

Support

Comments

comments

✅

QASM version string

✅

include

✅

unicode names

✅

qubit

🟡

Only supports physical qubits, and no arrays.

bit

✅

bool

✅

int

✅

Some support for comparisons against integers and casting.

uint

❌

float

❌

angle

❌

complex

❌

const

❌

pi/π/tau/τ/euler/ℇ

❌

Aliasing: let

❌

register concatenation

❌

casting

🟡

Casting between arrays of bits, int, and bool is supported

duration

✅

durationof

❌

ns/µs/us/ms/s/dt

✅

stretch

❌

delay

✅

barrier

✅

box

❌

Built-in U

✅

gate

✅

No support for non-basis gates

gphase

❌

ctrl @/ negctrl @

❌

inv @

❌

pow(k) @

❌

reset

✅

measure

✅

bit operations

✅

boolean operations

✅

arithmetic expressions

❌

comparisons

✅

if

✅

else

✅

else if

❌

for loops

🟡

Discrete sets and negative stepping is not supported.

while loops

❌

continue

❌

break

❌

return

❌

extern

🟡

Only for certain extern subroutines exposed by backend devices. It is currently not possible for clients to submit these.

def subroutines (classical)

❌

def subroutines (quantum)

❌

input

❌

output

❌