I guess the closest thing to a quantum hello world would be a simple quantum circuit—each line represents a qubit register, and various types of gates operate on the qubits.

To see quantum circuits that do something useful, check out the "Example Circuits" links that show up in the Quirk simulator: https://algassert.com/quirk

via https://algassert.com/2016/05/22/quirk.html via https://news.ycombinator.com/item?id=11752421