Selective Excitation of Superconducting Qubits with a Shared Control Line through Pulse Shaping

• URL: http://arxiv.org/abs/2501.10710v1
• Date: Sat, 18 Jan 2025 09:37:24 GMT
• Title: Selective Excitation of Superconducting Qubits with a Shared Control Line through Pulse Shaping
• Authors: R. Matsuda, R. Ohira, T. Sumida, H. Shiomi, A. Machino, S. Morisaka, K. Koike, T. Miyoshi, Y. Kurimoto, Y. Sugita, Y. Ito, Y. Suzuki, P. A. Spring, S. Wang, S. Tamate, Y. Tabuchi, Y. Nakamura, K. Ogawa, M. Negoro,
• Abstract summary: We propose a technique that suppresses unwanted excitations by shaping a drive pulse to create null points at non-target qubit frequencies. These results highlight the SEP technique as a promising tool for enhancing frequency-multiplexed qubit-control.
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• 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.

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