OpenQASM
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| OpenQASM | |
|---|---|
| Stable release | 3.1.0
/ May 15, 2024; 18 months ago (2024年05月15日) |
| Implementation language | Python |
| License | Apache License 2.0 |
| Filename extensions | .qasm |
| Website | openqasm |
Open Quantum Assembly Language (OpenQASM; pronounced open kazm)[1] is a programming language designed for describing quantum circuits and algorithms for execution on quantum computers.
Language
[edit ]It is designed to be an intermediate 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 of IBM's Quantum Information Software Kit (Qiskit) for use with their IBM Quantum Experience cloud quantum computing platform.[3] The language has similar qualities to traditional hardware description languages such as Verilog.
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 on GitHub.[4]
Examples
[edit ]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 = 0001 uint[4]b_in=15;// b = 1111 // initialize qubits resetcin; reseta; resetb; resetcout; // set input states foriin[0:3]{ if(bool(a_in[i]))xa[i]; if(bool(b_in[i]))xb[i]; } // add a to b, storing result in b majoritycin[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];
See also
[edit ]References
[edit ]- ^ a b c Cross, Andrew W.; Bishop, Lev S.; Smolin, John A.; Gambetta, Jay M. (2017). "Open Quantum Assembly Language". arXiv:1707.03429 [quant-ph].
- ^ "OpenQASM Live Specification" . Retrieved 26 December 2022.
- ^ qiskit-openqasm: OpenQASM specification, International Business Machines, 4 July 2017, archived from the original on 10 November 2020, retrieved 6 July 2017
- ^ https://github.com/openqasm/openqasm OpenQASM
- ^ "openqasm/adder.qasm at master · openqasm/openqasm · GitHub". GitHub . 29 January 2022.
