Multi-Purpose Architecture for Fast Reset and Protective Readout of Superconducting Qubits

• URL: http://arxiv.org/abs/2407.21332v1
• Date: Wed, 31 Jul 2024 04:44:40 GMT
• Title: Multi-Purpose Architecture for Fast Reset and Protective Readout of Superconducting Qubits
• Authors: Jiayu Ding, Yulong Li, He Wang, Guangming Xue, Tang Su, Chenlu Wang, Weijie Sun, Feiyu Li, Yujia Zhang, Yang Gao, Jun Peng, Zhi Hao Jiang, Yang Yu, Haifeng Yu, Fei Yan,
• Abstract summary: We present a novel multi-purpose architecture that enables fast reset and protection of superconducting qubits during control and readout. In our design, two on-chip diplexers are connected by two transmission lines. The high-pass branch provides a flat passband for convenient allocation of readout resonators above the qubit frequencies. We demonstrate resetting a transmon qubit from its first excited state to the ground state in 100 ns, achieving a residual population of 2.7%, mostly limited by the thermal effect.
• Score: 25.833934622405998
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The ability to fast reset a qubit state is crucial for quantum information processing. However, to actively reset a qubit requires engineering a pathway to interact with a dissipative bath, which often comes with the cost of reduced qubit protection from the environment. Here, we present a novel multi-purpose architecture that enables fast reset and protection of superconducting qubits during control and readout. In our design, two on-chip diplexers are connected by two transmission lines. The high-pass branch provides a flat passband for convenient allocation of readout resonators above the qubit frequencies, which is preferred for reducing measurement-induced state transitions. In the low-pass branch, we leverage a standing-wave mode below the maximum qubit frequency for a rapid reset. The qubits are located in the common stopband to inhibit dissipation during coherent operations. We demonstrate resetting a transmon qubit from its first excited state to the ground state in 100 ns, achieving a residual population of 2.7%, mostly limited by the thermal effect. The reset time may be further shortened to 27 ns by exploiting the coherent population inversion effect. We further extend the technique to resetting the qubit from its second excited state. Our approach promises scalable implementation of fast reset and qubit protection during control and readout, adding to the toolbox of dissipation engineering.

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