Andersson S, Havir H, Ranni A, Haldar S, Maisi V F
NanoLund and Solid State Physics, Lund University, Box 118, 22100, Lund, Sweden.
Nat Commun. 2025 Jan 9;16(1):552. doi: 10.1038/s41467-025-55860-8.
Nonlinear effects play a central role in photonics as they form the foundation for most of the device functionalities such as amplification and quantum state preparation and detection. Typically the nonlinear effects are weak and emerge only at high photon numbers with strong drive. Here we present an experimental study of a Josephson junction -based high-impedance resonator. We show that by taking the resonator to the limit of consisting effectively only of one junction, results in strong nonlinear effects already for the second photon while maintaining a high impedance of the resonance mode. Our experiment yields thus resonators with strong interactions both between individual resonator photons and from the resonator photons to other electric quantum systems. We also present an energy diagram technique which enables to measure, identify and analyse different multi-photon optics processes along their energy conservation lines.
非线性效应在光子学中起着核心作用，因为它们构成了大多数器件功能的基础，如放大、量子态制备和检测。通常情况下，非线性效应很微弱，只有在高光子数和强驱动时才会出现。在此，我们展示了基于约瑟夫森结的高阻抗谐振器的实验研究。我们表明，通过将谐振器限制在仅由一个结有效组成的极限情况下，即使对于第二个光子也会产生强烈的非线性效应，同时保持谐振模式的高阻抗。因此，我们的实验产生了在单个谐振器光子之间以及从谐振器光子到其他电量子系统之间具有强相互作用的谐振器。我们还提出了一种能量图技术，该技术能够沿着能量守恒线测量、识别和分析不同的多光子光学过程。
