论文标题

具有多个可调式变性的驱动量子超导电路

A driven quantum superconducting circuit with multiple tunable degeneracies

论文作者

Venkatraman, Jayameenakshi, Cortinas, Rodrigo G., Frattini, Nicholas E., Xiao, Xu, Devoret, Michel H.

论文摘要

我们介绍了在经受挤压驱动器的Kerr振荡器光谱中的多个同时变性的实验发现。这种挤压与KERR相互作用结合使用,在正弦驱动力的一半旋转的框架中产生了有效的静态两孔电势。值得注意的是,这些变性性可以按需打开和开关,它们的数量是可调的。我们发现,当振荡器的频率和驱动器的特征频率之间的$δ$等于KERR系数$ K $,$Δ/k = 2M $,振荡器显示$ M + 1 $ Exact,Pary-freatected,Pary-Freatected,Pary-Froting,Spectral spectral Enegeneracies,对驱动倍数不敏感。退化性源于在对我们实验的双重静态有效潜力的经典区域中隧道路径的异常破坏性干扰。利用这种干扰,我们测量了不一致的良好转换寿命的峰值增强,在我们的振荡器的基态歧管中产生了超受保护的猫量子。 {我们的结果证明了量子系统中的变性与噪声保护之间的关系。

We present the experimental discovery of multiple simultaneous degeneracies in the spectrum of a Kerr oscillator subjected to a squeezing drive. This squeezing, in combination with the Kerr interaction creates an effective static two-well potential in the frame rotating at half the frequency of the sinusoidal driving force. Remarkably, these degeneracies can be turned on-and-off on demand, and their number is tunable. We find that when the detuning $Δ$ between the frequency of the oscillator and characteristic frequency of the drive equals an even multiple of the Kerr coefficient $K$, $Δ/K = 2m$, the oscillator displays $m + 1$ exact, parity-protected, spectral degeneracies, insensitive to the drive amplitude. The degeneracies stem from the unusual destructive interference of tunnel paths in the classically forbidden region of the double well static effective potential that models our experiment. Exploiting this interference, we measure a peaked enhancement of the incoherent well-switching lifetime creating a super-protected cat qubit in the ground state manifold of our oscillator. {Our results demonstrate the relationship between degeneracies and noise protection in quantum systems.

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