1. Selective Excitation of Superconducting Qubits with a Shared Control Line through Pulse Shaping
- Author
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Matsuda, R., Ohira, R., Sumida, T., Shiomi, H., Machino, A., Morisaka, S., Koike, K., Miyoshi, T., Kurimoto, Y., Sugita, Y., Ito, Y., Suzuki, Y., Spring, P. A., Wang, S., Tamate, S., Tabuchi, Y., Nakamura, Y., Ogawa, K., and Negoro, M.
- Subjects
Quantum Physics - Abstract
In conventional architectures of superconducting quantum computers, each qubit is connected to its own control line, leading to a commensurate increase in the number of microwave lines as the system scales. Frequency-multiplexed qubit-control addresses this problem by enabling multiple qubits to share a single microwave line. However, it can cause unwanted excitation of non-target qubits, especially when the detuning between qubits is smaller than the pulse bandwidth. Here, we propose a selective-excitation-pulse (SEP) technique that suppresses unwanted excitations by shaping a drive pulse to create null points at non-target qubit frequencies. In a proof-of-concept experiment with three fixed-frequency transmon qubits, we demonstrate that the SEP technique achieves single-qubit gate fidelities comparable to those obtained with conventional Gaussian pulses while effectively suppressing unwanted excitations in non-target qubits. These results highlight the SEP technique as a promising tool for enhancing frequency-multiplexed qubit-control.
- Published
- 2025