Engineering a Multi-Mode Purcell Filter for Superconducting-Qubit Reset and Readout with Intrinsic Purcell Protection

• URL: http://arxiv.org/abs/2507.04676v1
• Date: Mon, 07 Jul 2025 05:46:29 GMT
• Title: Engineering a Multi-Mode Purcell Filter for Superconducting-Qubit Reset and Readout with Intrinsic Purcell Protection
• Authors: Xu-Yang Gu, Da'er Feng, Zhen-Yu Peng, Gui-Han Liang, Yang He, Yongxi Xiao, Ming-Chuan Wang, Yu Yan, Bing-Jie Chen, Zheng-Yang Mei, Yi-Zhou Bu, Jia-Chi Zhang, Jia-Cheng Song, Cheng-Lin Deng, Xiaohui Song, Dongning Zheng, Kai Xu, Zhongcheng Xiang, Heng Fan,
• Abstract summary: We demonstrate a mode-efficient approach to qubit reset and readout using a multi-mode Purcell filter in a superconducting quantum circuit.<n>This is the first experimental trial that exploits different-order modes of a microwave resonator for distinct qubit operations.
• Score: 12.768431070160563
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Efficient qubit reset and leakage reduction are essential for scalable superconducting quantum computing, particularly in the context of quantum error correction. However, such operations often require additional on-chip components. Here, we propose and experimentally demonstrate a mode-efficient approach to qubit reset and readout using a multi-mode Purcell filter in a superconducting quantum circuit. We exploit the inherent multi-mode structure of a coplanar waveguide resonator, using its fundamental and second-order modes for qubit reset and readout, respectively, thereby avoiding additional circuit elements. Implemented in a flip-chip architecture, our device achieves unconditional reset with residual excitation below 1% in 220 ns, and a leakage reduction unit that selectively resets the second excited state within 62 ns. Simulations predict Purcell-limited relaxation times exceeding 1 ms over an 800 MHz bandwidth. To our knowledge, this is the first experimental trial that exploits different-order modes of a microwave resonator for distinct qubit operations, representing a new direction toward scalable, mode-efficient quantum processor design.

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