Yubin Zhang

A Low-Noise and High-Stability DC Source for Superconducting Quantum Circuits

  1. Daxiong Sun,
  2. Jiawei Zhang,
  3. Peisheng Huang,
  4. Yubin Zhang,
  5. Zechen Guo,
  6. Tingjin Chen,
  7. Rui Wang,
  8. Xuandong Sun,
  9. Jiajian Zhang,
  10. Wenhui Huang,
  11. Jiawei Qiu,
  12. Ji Chu,
  13. Ziyu Tao,
  14. Weijie Guo,
  15. Xiayu Linpeng,
  16. Ji Jiang,
  17. Jingjing Niu,
  18. Youpeng Zhong,
  19. and Dapeng Yu
With the rapid scaling of superconducting quantum processors, electronic control systems relying on commercial off-the-shelf instruments face critical bottlenecks in signal density,power consumption, and crosstalk mitigation. Here we present a custom dual-channel direct current (DC) source module (QPower) dedicated for large-scale superconducting quantum processors. The module delivers a voltage range of ±7 V with 200 mA maximum current per channel, while achieving the following key performance benchmarks: noise spectral density of 20 nV/Hz‾‾‾√ at 10 kHz, output ripple <500 μVpp within 20 MHz bandwidth, and long-term voltage drift <5 μVpp over 12 hours. Integrated into the control electronics of a 66-qubit quantum processor, QPower enables qubit coherence times of T1=87.6 μs and Ramsey T2=5.1 μs, with qubit resonance frequency drift constrained to ±40 kHz during 12-hour operation. This modular design is compact in size and efficient in energy consumption, providing a scalable DC source solution for intermediate-scale quantum processors with stringent noise and stability requirements, with potential extensions to other quantum hardware platforms and precision measurement.[/expand]
arxiv pdf

M2CS: A Microwave Measurement and Control System for Large-scale Superconducting Quantum Processors

  1. Jiawei Zhang,
  2. Xuandong Sun,
  3. Zechen Guo,
  4. Yuefeng Yuan,
  5. Yubin Zhang,
  6. Ji Chu,
  7. Wenhui Huang,
  8. Yongqi Liang,
  9. Jiawei Qiu,
  10. Daxiong Sun,
  11. Ziyu Tao,
  12. Jiajian Zhang,
  13. Weijie Guo,
  14. Ji Jiang,
  15. Xiayu Linpeng,
  16. Yang Liu,
  17. Wenhui Ren,
  18. Jingjing Niu,
  19. Youpeng Zhong,
  20. and Dapeng Yu
As superconducting quantum computing continues to advance at an unprecedented pace, there is a compelling demand for the innovation of specialized electronic instruments that act as
crucial conduits between quantum processors and host computers. Here, we introduce a Microwave Measurement and Control System (M2CS) dedicated for large-scale superconducting quantum processors. M2CS features a compact modular design that balances overall performance, scalability, and flexibility. Electronic tests of M2CS show key metrics comparable to commercial instruments. Benchmark tests on transmon superconducting qubits further show qubit coherence and gate fidelities comparable to state-of-the-art results, confirming M2CS’s capability to meet the stringent requirements of quantum experiments run on intermediate-scale quantum processors. The system’s compact and scalable design offers significant room for further enhancements that could accommodate the measurement and control requirements of over 1000 qubits, and can also be adopted to other quantum computing platforms such as trapped ions and silicon quantum dots. The M2CS architecture may also be applied to wider range of scenarios, such as microwave kinetic inductance detectors, as well as phased array radar systems.
arxiv pdf