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Description:

quantumxir 0.2.2

XIR is an intermediate representation language for quantum circuits.

Features

Simple. Easy to learn, write, and understand.

Modular. Compose observables, gates, and entire XIR programs.

Flexible. Declare or define your own gates and observables.

Installation
XIR requires Python version 3.7 or above. Installation of XIR, as well as all
dependencies, can be done using pip:
pip install quantum-xir

Examples
A curated selection of XIR scripts can be found in the Examples page of the Sphinx documentation; however, the example below demonstrates a general overview of the syntax:
// Include additional script
use my_declarations;

// Declare custom gates
gate RX(theta) [w1];
gate RY(theta) [w1];
gate RZ(theta) [w1];
gate Toffoli [w1, w2, w3];

// Declare a function
func sin(x);

// Declare observables
obs X [w1]; obs Y [w1]; obs Z [w1];

// Declare outputs
out sample(shots) [0..8];
out expval(observable) [w1, w2];
out amplitude(state) [0..8];

// Define a composite gate.
gate R3T(theta)[a, b, c, d]:
RX(theta: -2.3932854391951004) | [a];
RY(theta) | [b];
RZ(pi / sin(3 * 4 / 2 - 2)) | [c];
Toffoli | [b, c, d];
end;

// Define an observable.
obs XYZ [w1, w2]:
-1.6, X[w1];
0.73, Y[w1] @ Z[w2];
end;

// Apply the gate twice.
R3T(1.23) | [0, 1, 2, 3];
R3T(theta: 3.21) | [4..8];

// Compute various outputs.
sample(shots: 1000) | [0..8];
expval(observable: XYZ) | [0, 3];
amplitude(state: [0, 1, 0, 1, 0, 0, 1, 1]) | [0..8];

Contributing to XIR
We welcome contributions - simply fork the XIR repository, and then make a pull
request containing your
contribution. All contributors to XIR will be listed as authors on the releases.
See our changelog
for more details.
We also encourage bug reports, suggestions for new features and enhancements,
and even links to cool projects or applications built on XIR. Visit the contributions
page
to learn more about sharing your ideas with the XIR team.
Support

Source Code: https://github.com/XanaduAI/xir
Issue Tracker: https://github.com/XanaduAI/xir/issues

If you are having issues, please let us know by posting the issue on our GitHub issue tracker.
Authors
XIR is the work of many contributors.
License
XIR is free and open source, released under the
Apache License, Version 2.0.