DEMUXYZ Gate Using Single Microwave Drive Line for Multiple Qubits*

Superconducting qubits have the potential to lead to large-scale quantum computers with 10⁵ or more qubits in 2D arrays. As the number of qubits increases, finding methods to connect all the necessary control lines to each qubit can become a serious challenge. In this talk, we introduce a new one-qubit gate: DEMUXYZ. This gate makes it possible to decrease the number of microwave control lines from N² to 1 by allowing multiple qubits to share a single microwave line. The shared line carries a continuous wave (CW) microwave tone, which is initially detuned from the qubits’ idle frequency. When a qubit must undergo an arbitrary rotation on the Bloch sphere, the qubit is tuned on resonance with the CW tone and allowed to interact with the drive for the duration required to achieve the desired rotation. The rotation phase is tuned by detuning the qubit frequency away from the drive and idle frequency for the required time length. We demonstrate a first proof of concept for this gate performing experiments on two Xmon transmon qubits.