论文标题
量化耗散和温度对超导Qubit-cavity系统动力学的影响
Quantifying the effects of dissipation and temperature on dynamics of a superconducting qubit-cavity system
论文作者
论文摘要
涉及约瑟夫森连接的超导电路提供宏观量子两级系统（QUBIT），该系统与空腔谐振器耦合并通过微波信号进行操作。在这项工作中，我们研究了超导量子位的动力学，并在腔体温度结构域中包括耗散。在第一步中，使用经典的有限元方法来模拟腔和基本电路元素，以建模约瑟夫森连接。然后，进行电路的量化，以使用连接的能量分区比例获得系统的全哈密顿量。一旦获得了哈密顿量的参数，使用一组逼真的耗散参数通过lindblad方程来研究动力学，并包括温度效应。最后，我们获得了带有量子烙印的时间的频谱和/或动力学。此类设备在数十毫升的开尔文上工作，我们搜索一组参数，可以在高达1 k的温度下观察到量子行为。
The superconducting circuits involving Josephson junction offer macroscopic quantum two-level system (qubit) which are coupled to cavity resonators and are operated via microwave signals. In this work, we study the dynamics of superconducting qubits coupled to a cavity with including dissipation in a subkelvin temperature domain. In the first step, a classical Finite Element Method is used to simulate the cavities and basic circuit elements to model Josephson junctions. Then the quantization of the circuit is done to obtain the full Hamiltonian of the system using energy partition ratios of the junctions. Once the parameters of Hamiltonian are obtained, the dynamics is studied via Lindblad equation for an open quantum system using a realistic set of dissipative parameters and include temperature effects. Finally, we get frequency spectra and/or dynamics of the system with time which have quantum imprints. Such devices work at tens of milli Kelvins and we search for a set of parameters which could enable to observe quantum behaviour at temperatures as high as 1 K.
