main.go

package main

import (
	"github.com/niemeyer/qml"
)

func main() {
	qml.Init(nil)
	engine := qml.NewEngine()

	component, err := engine.LoadFile("particle.qml")
	if err != nil {
		panic(err)
	}

	window := component.CreateWindow(nil)

	window.Show()
	window.Wait()
}

particle.qml

import QtQuick 2.0

Rectangle {
	id: root

	width: 640
	height: 480
}