Graphical circuit composer/editor – Here in this area, you can construct your circuit. You can drag gates and other operations onto the horizontal qubit “wires” that make up your quantum register. If you need to edit parameters such as control and gate settings, just select the gate (by clicking on it) in the gate composer area and click the Edit icon.
Here is a brief video tour explaining how the composer area interacts with the gates, including the specific tools for gates on click and also for the composer area.
Filename: Here a user can type the filename of the circuit created on the composer area. If the user doesn’t name the file then by default filename is assigned with the circuit as a prefix appended with the jobID.
Tools of Circuit Composer Area
Composer-Specific Area Tools:
Access frequently used tools to Manage, Undo, Redo, and Clear operations.
- Composer Area – Use the circuit composer to drag and drop the gates, allowing you to view and edit the dropped gates or modify the QASM code generated for the dropped circuit of gates.
- Manage: The manage option provides a user with changes to the number of Quantum Registers(qubits or ‘q’) and Classical Registers(registers or ‘c’) as required. To add or remove quantum or classical registers, click Manage registers. You can increase or decrease the number of qubits or registers and then click Save.
- Undo: This tool is specifically meant to undo the last change made to the circuit area, with absolute certainty.
- Redo: This tool is specifically meant to redo the last change made to the circuit area, with absolute certainty.
- Clear: To clear the circuit area all at once.
Gate-Specific Tools:
Access gates-specific tools to Edit, Delete, Expand, and information regarding each gate dropped on the composer area.
- Edit: This option is activated by clicking on the gate in the composer area. This feature allows users to make changes to the qubit number until the gate can be extended as per the user’s preference. To add a control to any gate modify the control bit number as per preference. For specific gates like the Toffoli gate(CCX), you can add both control bits (a & b) as well as the target bit.
- Delete: To remove a gate from a qubit line, select the gate and click the trash can icon. You can also drag the selected gate outside of the composer area to remove the gate.
- Expand: Upon clicking the gate, initiates the expansion process for the specific gate. This action will trigger the gate to open, revealing additional content, of how this gate is made with a combination of other unitary gates or how the gate is managed if interacting with more than one qubit. Users can expect an extended view or access to supplementary features by interacting with the gate through a click.
- Information: This user action activates a detailed display, unveiling comprehensive details, or relevant data associated with the selected gate. Users can anticipate and understand specific attributes or functionalities linked to the clicked gate like its gate matrix. This dynamic interaction enhances the user experience, providing a seamless transition to an expanded state of information or functionality associated with the gate.
- For a few gates such as Pauli X-Gate on clicking i will take to the gate matrix section to show it’s x, y, and z basis representation.
It contains the gate information such as Gate Name, Operator Gate representation, and the Gate Matrix if available for the specific gate.