 | This articlerelies excessively onreferences toprimary sources. Please improve this article by addingsecondary or tertiary sources. Find sources: "OpenQASM" – news ·newspapers ·books ·scholar ·JSTOR(September 2018) (Learn how and when to remove this message) |
| Stable release | 3.1.0 / May 15, 2024; 10 months ago (2024-05-15) |
|---|---|
| Implementation language | Python |
| License | Apache License 2.0 |
| Filename extensions | .qasm |
| Website | openqasm |
Open Quantum Assembly Language (OpenQASM; pronouncedopen kazm)[1] is aprogramming language designed for describingquantum circuits andalgorithms for execution on quantum computers.
It is designed to be anintermediate representation that can be used by higher-level compilers to communicate with quantum hardware, and allows for the description of a wide range of quantum operations, as well as classical feed-forward flow control based on measurement outcomes.
The language includes a mechanism for describing explicit timing of instructions, and allows for the attachment of low-level definitions to gates for tasks such as calibration.[1] OpenQASM is not intended for general-purpose classical computation, and hardware implementations of the language may not support the full range of data manipulation described in the specification. Compilers for OpenQASM are expected to support a wide range of classical operations for compile-time constants, but the support for these operations on runtime values may vary between implementations.[2]
The language was first described in a paper published in July 2017,[1] and a reference source code implementation was released as part ofIBM's Quantum Information Software Kit (Qiskit) for use with theirIBM Quantum Experiencecloud quantum computing platform.[3] The language has similar qualities to traditionalhardware description languages such asVerilog.
OpenQASM defines its version at the head of a source file as a number, as in the declaration:
OPENQASM3;
The level of OpenQASM's original published implementations is OpenQASM 2.0. Version 3.0 of the specification is the current one and can be viewed at the OpenQASM repository onGitHub.[4]
The following is an example of OpenQASM source code from the official library. The program adds two four-bit numbers.[5]
/* * quantum ripple-carry adder * Cuccaro et al, quant-ph/0410184 */OPENQASM3;include"stdgates.inc";gatemajoritya,b,c{cxc,b;cxc,a;ccxa,b,c;}gateunmaja,b,c{ccxa,b,c;cxc,a;cxa,b;}qubit[1]cin;qubit[4]a;qubit[4]b;qubit[1]cout;bit[5]ans;uint[4]a_in=1;// a = 0001uint[4]b_in=15;// b = 1111// initialize qubitsresetcin;reseta;resetb;resetcout;// set input statesforiin[0:3]{if(bool(a_in[i]))xa[i];if(bool(b_in[i]))xb[i];}// add a to b, storing result in bmajoritycin[0],b[0],a[0];foriin[0:2]{majoritya[i],b[i+1],a[i+1];}cxa[3],cout[0];foriin[2:-1:0]{unmaja[i],b[i+1],a[i+1];}unmajcin[0],b[0],a[0];measureb[0:3]->ans[0:3];measurecout[0]->ans[4];
| General | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Theorems | |||||||||
| Quantum communication |
| ||||||||
| Quantum algorithms | |||||||||
| Quantum complexity theory | |||||||||
| Quantum processor benchmarks | |||||||||
| Quantum computing models | |||||||||
| Quantum error correction | |||||||||
| Physical implementations |
| ||||||||
| Quantum programming | |||||||||
| History | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Products |
| ||||||||
| Business entities |
| ||||||||
| Facilities |
| ||||||||
| Initiatives | |||||||||
| Inventions | |||||||||
| Terminology | |||||||||
| CEOs |
| ||||||||
| Board of directors | |||||||||
| Other | |||||||||
