Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states

Abstract

With the long coherence time, the fixed-frequency transmon qubit is a promising qubit modality for quantum computing. Currently, diverse qubit architectures that utilize fixed-frequency transmon qubits have been demonstrated with high-fidelity gate performance. Nevertheless, the relaxation times of transmon qubits can have large temporal fluctuations, causing instabilities in gate performance. The fluctuations are often believed to be caused by nearly on-resonance couplings with sparse two-level-system (TLS) defects. To mitigate their impact on qubit coherence and gate performance, one direct approach is to tune the qubits away from these TLSs. In this work, to combat the potential TLS-induced performance fluctuations in a tunable-bus architecture unitizing fixed-frequency transmon qubits, we explore the possibility of using an off-resonance microwave drive to effectively tuning the qubit frequency through the ac-Stark shift while implementing universal gate operations on the microwave-dressed qubit. We show that the qubit frequency can be tuned up to 20 MHz through the ac-stark shift while keeping minimal impacts on the qubit control. Besides passive approaches that aim to remove these TLSs through more careful treatments of device fabrications, this work may offer an active approach towards mitigating the TLS-induced performance fluctuations in fixed-frequency transmon qubit devices.

arXiv comment12 pages,9 figures

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Cited by in corpus (5)

• TLS Dynamics in a Superconducting Qubit Due to Background Ionizing Radiation
• Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields
• Identification of different types of high-frequency defects in superconducting qubits
• Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems
• Baseband control of superconducting qubits with shared microwave drives