基于光传输信号的超导量子比特高保真度控制
High fidelity control of superconducting qubits with optical transmitted signal
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中文总结 AI 辅助
针对稀释制冷机内信号电缆的空间与热负载限制，研究采用光辅助传输线替代同轴电缆，实现了超导量子比特的高保真控制，单、两量子比特门保真度达表面码要求。
中文摘要 AI 辅助
超导电路在构建大规模量子模拟与计算系统方面展现出巨大潜力，具备大量量子比特、长退相干时间及精确控制等特性。然而，稀释制冷机内信号电缆数量的增加受空间和热负载限制，带来了挑战。为解决该问题，我们实验实现了光辅助传输线作为同轴电缆的替代方案：在室温下通过激光强度调制微波信号，并在稀释制冷机内的低温板上再生信号，利用光电流实现对超导量子比特的全面控制。我们在频率可调的transmon量子比特上演示并基准测试了单量子比特和两量子比特门，分别达到99.915%±0.005%和99.676%的保真度，满足表面码的要求。
英文摘要
Superconducting circuits exhibit remarkable potential for constructing large-scale quantum simulation and computation systems, featuring numerous qubits, extended coherence time, and precise control. Nevertheless, the growing number of signal cables poses a challenge in dilution refrigerators due to space and heat load constraints. To overcome this issue, we experimentally implemented an optically-assisted transmission line as an alternative to coaxial cables. By modulating microwave signals on laser intensities at room temperature and regenerating the signals at a cryogenic plate within the dilution refrigerator, we demonstrated full control of superconducting qubits using photocurrent. We demonstrate and benchmark both single-qubit and two-qubit gates on frequency tunable transmon qubits, achieving fidelities of 99.915% $\pm$ 0.005% and 99.676% $\pm$ 0.041%, respectively, which have reached the requirement of the surface code.
