Basic Actions

• add gate: drag gate from toolbox to circuit
• move gate: drag gate in circuit
• remove gate: drag gate out of circuit OR middle-click gate
• undo: ctrl + Z OR click 'undo' button
• redo: ctrl + shift + Z OR ctrl + Y OR click 'redo' button
• save circuit: bookmark the page with your browser
• load circuit: open the bookmark
• add qubit: drag gate onto extra wire that appears while dragging
• remove qubit: re-arrange gates so that the bottom wire is unused
• show intermediate state: drag a display gate onto the circuit
• view tips: hover with mouse OR awkwardly tap-hold with finger

Advanced Actions

• copy gate: shift + drag gate in circuit
• move column: ctrl + drag in circuit
• copy column: ctrl + shift + drag in circuit
• create custom gate: click 'Make Gate' button
• remove custom gate: [crummy support] have to use undo or clear all or manually edit URL

Conventions

• Coordinates
  • Right-handed
  • X is +right/-left
  • Y is +forward/-backward
  • Z is +up/-down
• Ordering
  • Top wire is the low bit. Bottom wire is the high bit.
  • Kets are big-endian. |00101⟩ is 5, not 20.
  • Listed/grided values are in ascending row-major order from top left to bottom right.
• Colors
  • Blue: amplitudes
  • Green: probabilities / densities
  • Yellow: change / varying
  • Orange: focused
  • Red: error / attention