Dephasing-assisted diffusive dynamics in superconducting quantum circuits

• URL: http://arxiv.org/abs/2411.15571v1
• Date: Sat, 23 Nov 2024 14:14:36 GMT
• Title: Dephasing-assisted diffusive dynamics in superconducting quantum circuits
• Authors: Yongqi Liang, Changrong Xie, Zechen Guo, Peisheng Huang, Wenhui Huang, Yiting Liu, Jiawei Qiu, Xuandong Sun, Zilin Wang, Xiaohan Yang, Jiawei Zhang, Jiajian Zhang, Libo Zhang, Ji Chu, Weijie Guo, Ji Jiang, Xiayu Linpeng, Song Liu, Jingjing Niu, Yuxuan Zhou, Wenhui Ren, Ziyu Tao, Youpeng Zhong, Dapeng Yu,
• Abstract summary: We first demonstrate the diffusive dynamics assisted by controlled dephasing noise in superconducting quantum circuits. We show that dephasing can enhance localization in a superconducting qubit array with quasiperiodic order. By preparing different excitation distributions in the qubit array, we observe that a more localized initial state relaxes to a uniformly distributed mixed state faster with dephasing noise.
• Score: 14.808613294313902
• License:
• Abstract: Random fluctuations caused by environmental noise can lead to decoherence in quantum systems. Exploring and controlling such dissipative processes is both fundamentally intriguing and essential for harnessing quantum systems to achieve practical advantages and deeper insights. In this Letter, we first demonstrate the diffusive dynamics assisted by controlled dephasing noise in superconducting quantum circuits, contrasting with coherent evolution. We show that dephasing can enhance localization in a superconducting qubit array with quasiperiodic order, even in the regime where all eigenstates remain spatially extended for the coherent counterpart. Furthermore, by preparing different excitation distributions in the qubit array, we observe that a more localized initial state relaxes to a uniformly distributed mixed state faster with dephasing noise, illustrating another counterintuitive phenomenon called Mpemba effect, i.e., a far-from-equilibrium state can relax toward the equilibrium faster. These results deepen our understanding of diffusive dynamics at the microscopic level, and demonstrate controlled dissipative processes as a valuable tool for investigating Markovian open quantum systems.

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