驱动电路QED的动态双稳性
Dynamical bistability in the driven circuit QED
摘要：
我们发现，驱动电路量子电动力学设置的非线性响应显示反共振多光子跃迁，最近观察到的transmon量子比特设备。考虑到光子泄漏，我们用微扰和半经典分析解释了这种线型。我们推导出一个半经典的准能表面，其最低准能本征态是压缩的，允许一个压缩依赖的局部有效温度。我们研究了亚稳态的逃逸动力学，发现了类似于量子Duffing振子的动力学隧穿特征。
英文摘要：
We show that the nonlinear response of a driven circuit quantum electrodynamics setup displays antiresonant multiphoton transitions, as recently observed in a transmon qubit device. By including photon leaking, we explain the lineshape by a perturbative and a semiclassical analysis. We derive a bistable semiclassical quasienergy surface whose lowest quasienergy eigenstate is squeezed, allowing for a squeezing-dependent local effective temperature. We study the escape dynamics out of the metastable state and find signatures of dynamical tunneling, similar as for the quantum Duffing oscillator.
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