Enhancement and state tomography of a squeezed vacuum with circuit quantum electrodynamics
Enhancement and state tomography of a squeezed vacuum with circuit quantum electrodynamics
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DOI：
10.1103/physreva.92.013826
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发表时间：
2015-01
影响因子：
2.9
通讯作者：
M. Elliott;E. Ginossar
中科院分区：
文献类型：
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作者：
M. Elliott;E. Ginossar
研究了耗散和非经典驱动作用下一般四次相互作用哈密顿量的动力学。我们表明，这种情况下，可以实现与级联超导腔量子比特系统在强色散制度的设置类似于最近的实验。在耗散的存在下，我们发现，一个有效的Hartree型解耦与福克-普朗克方程产生一个很好的近似。我们发现定态近似为一个压缩真空，它被腔的Q因子增强，但被相互作用守恒。因此，量子比特的非线性，并没有显着影响的高度压缩的腔内微波场，但对于一系列的现实参数，使巡回压缩场的表征。
We study the dynamics of a general quartic interaction Hamiltonian under the influence of dissipation and nonclassical driving. We show that this scenario could be realized with a cascaded superconducting cavity-qubit system in the strong dispersive regime in a setup similar to recent experiments. In the presence of dissipation, we find that an effective Hartree-type decoupling with a Fokker-Planck equation yields a good approximation. We find that the stationary state is approximately a squeezed vacuum, which is enhanced by the Q factor of the cavity but conserved by the interaction. The qubit nonlinearity, therefore, does not significantly influence the highly squeezed intracavity microwave field but, for a range of realistic parameters, enables characterization of itinerant squeezed fields.