Peiheng Wu

Nanoscale electrothermal-switch superconducting diode for electrically programmable superconducting circuits

  1. Tianyu Li,
  2. Jiong Li,
  3. Chong Li,
  4. Peiyuan Huang,
  5. Nuo-Zhou Yang,
  6. Wuyue Xu,
  7. Wen-Cheng Yue,
  8. Yang-Yang Lyu,
  9. Yihuang Xiong,
  10. Xuecou Tu,
  11. Tao Tao,
  12. Xiaoqing Jia,
  13. Qing-Hu Chen,
  14. Huabing Wang,
  15. Peiheng Wu,
  16. and Yong-Lei Wang
Superconducting diodes enable dissipationless directional transport, yet achieving electrical tunability and scalability remains a major challenge for circuit-level integration. Here,
we demonstrate an electrothermal-switch superconducting diode in which a gate-controlled nanoscale hotspot dynamically breaks inversion symmetry in a superconducting nanowire. This mechanism gives rise to two coexisting nonreciprocal transport regimes-one associated with a nonreciprocal superconducting-to-normal transition and the other with ratchet-like vortex dynamics-both originating from the same electrothermal-switch process. The diode exhibits efficiencies up to 42% and 60% for the two regimes, respectively, and can be electrically switched on, off, or reversed in polarity in situ by applying a small gate current. These capabilities enable programmable superconducting circuits that realize electrically reconfigurable full-wave and half-wave rectification. The lithography-compatible design, high performance, and gate-controlled functionality establish a scalable platform for programmable superconducting electronics and hybrid quantum systems.
arxiv pdf

Landau-Zener-Stuckelberg-Majorana interference in a 3D transmon driven by a chirped microwave

  1. Ming Gong,
  2. Yu Zhou,
  3. Dong Lan,
  4. Yunyi Fan,
  5. Jiazheng Pan,
  6. Haifeng Yu,
  7. Jian Chen,
  8. Guozhu Sun,
  9. Yang Yu,
  10. Siyuan Han,
  11. and Peiheng Wu
By driving a 3D transmon with microwave fields, we generate an effective avoided energy-level crossing. Then we chirp microwave frequency, which is equivalent to driving the system
through the avoided energy-level crossing by sweeping the avoided crossing. A double-passage chirp produces Landau-Zener-St\“uckelberg-Majorana interference that agree well with the numerical results. Our method is fully applicable to other quantum systems that contain no intrinsic avoided level crossing, providing an alternative approach for quantum control and quantum simulation.
arxiv pdf

Entanglement dynamics of a superconducting phase qubit coupled to a two-level system

  1. Guozhu Sun,
  2. Zhongyuan Zhou,
  3. Bo Mao,
  4. Xueda Wen,
  5. Peiheng Wu,
  6. and Siyuan Han
We report the observation and quantitative characterization of driven and spontaneous oscillations of quantum entanglement, as measured by concurrence, in a bipartite system consisting
of a macroscopic Josephson phase qubit coupled to a microscopic two-level system. The data clearly show the behavior of entanglement dynamics such as sudden death and revival, and the effect of decoherence and ac driving on entanglement.
arxiv pdf