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Observation of Pairwise Level Degeneracies and the Quantum Regime of the Arrhenius Law in a Double-Well Parametric Oscillator
Physical Review X ( IF 11.6 ) Pub Date : 2024-09-03 , DOI: 10.1103/physrevx.14.031040 Nicholas E. Frattini 1 , Rodrigo G. Cortiñas 1 , Jayameenakshi Venkatraman 1 , Xu Xiao 1 , Qile Su 1 , Chan U. Lei 1 , Benjamin J. Chapman 1 , Vidul R. Joshi 1 , S. M. Girvin 1 , Robert J. Schoelkopf 1 , Shruti Puri 1 , Michel H. Devoret 1
Physical Review X ( IF 11.6 ) Pub Date : 2024-09-03 , DOI: 10.1103/physrevx.14.031040 Nicholas E. Frattini 1 , Rodrigo G. Cortiñas 1 , Jayameenakshi Venkatraman 1 , Xu Xiao 1 , Qile Su 1 , Chan U. Lei 1 , Benjamin J. Chapman 1 , Vidul R. Joshi 1 , S. M. Girvin 1 , Robert J. Schoelkopf 1 , Shruti Puri 1 , Michel H. Devoret 1
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By applying a microwave drive to a specially designed Josephson circuit, we have realized a double-well model system: a Kerr oscillator submitted to a squeezing force. We have observed, for the first time, the spectroscopic fingerprint of a quantum double-well Hamiltonian when its barrier height is increased: a pairwise level kissing (coalescence) corresponding to the exponential reduction of tunnel splitting in the excited states as they sink under the barrier. The discrete levels in the wells also manifest themselves in the activation time across the barrier which, instead of increasing smoothly as a function of the barrier height, presents steps each time a pair of excited states is captured by the wells. This experiment illustrates the quantum regime of Arrhenius’s law, whose observation is made possible here by the unprecedented combination of low dissipation, time-resolved state control, 98.5% quantum nondemolition single shot measurement fidelity, and complete microwave control over all Hamiltonian parameters in the quantum regime. Direct applications to quantum computation and simulation are discussed.
中文翻译：
在双阱参数振荡器中观察成对能级简并和阿伦尼乌斯定律的量子机制
通过将微波驱动器应用于专门设计的 Josephson 电路，我们实现了一个双阱模型系统：一个承受挤压力的 Kerr 振荡器。我们首次观察到量子双阱哈密顿量在势垒高度增加时的光谱指纹：成对水平接吻（聚结），对应于激发态下沉到势垒下时隧道分裂的指数减少。孔中的离散水平也体现在跨屏障的激活时间中，该时间不是随着屏障高度的函数而平滑增加，而是在每次孔捕获一对激发态时呈现步骤。该实验说明了阿伦尼乌斯定律的量子机制，通过低耗散、时间分辨状态控制、98.5% 量子非破坏单发测量保真度以及对量子状态中所有哈密顿参数的完全微波控制，前所未有的组合使阿伦尼乌斯定律的观察成为可能。讨论了量子计算和模拟的直接应用。
更新日期：2024-09-03
中文翻译：
在双阱参数振荡器中观察成对能级简并和阿伦尼乌斯定律的量子机制
通过将微波驱动器应用于专门设计的 Josephson 电路，我们实现了一个双阱模型系统：一个承受挤压力的 Kerr 振荡器。我们首次观察到量子双阱哈密顿量在势垒高度增加时的光谱指纹：成对水平接吻（聚结），对应于激发态下沉到势垒下时隧道分裂的指数减少。孔中的离散水平也体现在跨屏障的激活时间中，该时间不是随着屏障高度的函数而平滑增加，而是在每次孔捕获一对激发态时呈现步骤。该实验说明了阿伦尼乌斯定律的量子机制，通过低耗散、时间分辨状态控制、98.5% 量子非破坏单发测量保真度以及对量子状态中所有哈密顿参数的完全微波控制，前所未有的组合使阿伦尼乌斯定律的观察成为可能。讨论了量子计算和模拟的直接应用。
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