There's a few gates that you can only create by editing the URL ;). Examples include the X-axis post-selection gates "|+⟩⟨+|" and "|-⟩⟨-|", some square-wave ga

There's a few gates that you can only create by editing the URL ;). Examples include the X-axis post-selection gates "|+⟩⟨+|" and "|-⟩⟨-|", some square-wave gates "X^⌈t⌉" and "X^⌈t-¼⌉" that were made redundant by the counting gate, the impossible universal-not gate "__unstable__UniversalNot" [1], and the error injection gate "__error__". 1: http://physics.stackexchange.com/a/247178/911 http://physics.stackexchange.com/a/247178/911