Dynamical polaron Ansatz: A theoretical tool for the ultrastrong-coupling regime of circuit QED

被引：45

作者：

Diaz-Camacho, Guillermo ^{[1
]}

Bermudez, Alejandro ^{[1
]}

Jose Garcia-Ripoll, Juan ^{[1
]}

机构：

[1] CSIC, Inst Fis Fundamental, Calle Serrano 113b, Madrid 28006, Spain

来源：

PHYSICAL REVIEW A | 2016年 / 93卷 / 04期

关键词：

DENSITY-MATRIX RENORMALIZATION; 2-LEVEL SYSTEM; VARIATIONAL CALCULATION; 2-STATE SYSTEM; GROUND-STATES; SPIN CHAINS; QUANTUM; DISSIPATION; BATH; EQUIVALENCE;

D O I：

10.1103/PhysRevA.93.043843

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this work we develop a semianalytical variational Ansatz to study the properties of few-photon excitations interacting with a collection of quantum emitters in regimes that go beyond the rotating-wave approximation. This method can be used to approximate both the static and dynamical properties of a superconducting qubit in an open transmission line, including the spontaneous emission spectrum and the resonances in scattering experiments. The approximations are quantitatively accurate for rather strong couplings, as shown by a direct comparison to matrix-product-state numerical methods, and provide also a good qualitative description for stronger couplings well beyond the Markovian regime.

引用

页数：13

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