Generation of macroscopic Schrodinger-cat states in qubit-oscillator systems
Generation of macroscopic Schrodinger-cat states in qubit-oscillator systems
复制标题
量子位振荡器系统中宏观薛定谔猫状态的生成
DOI：
10.1103/physreva.93.033853
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发表时间：
2016-03-28
影响因子：
2.9
通讯作者：
Tian, Lin
中科院分区：
文献类型：
--
作者：
Liao, Jie-Qiao;Huang, Jin-Feng;Tian, Lin
我们提出了一个方案，通过条件位移机制，在量子谐振子（电磁场或机械谐振器）耦合到量子比特（二能级系统）中产生宏观薛定谔猫态。通过单色地驱动量子位，量子位状态的振荡修改了作用在振荡器上的驱动力的有效频率，并且可以实现对振荡器的谐振或近谐振驱动。然后，由于驱动力的小失谐，振荡器的位移显著增强，并且可以超过零点波动的位移。这种效应可以用来在振荡器中制备宏观上不同的相干态的量子叠加。我们提出了详细的研究在封闭和开放系统的情况下，这种状态生成方案。这种方法可以在各种实验平台上实现，例如腔或电路QED系统，机电系统和自旋悬臂梁系统。
We propose a scheme to generate macroscopic Schrodinger-cat states in a quantum harmonic oscillator (electromagnetic field or mechanical resonator) coupled to a quantum bit (two-level system) via a conditional displacement mechanism. By driving the qubit monochromatically, the oscillation of the qubit state modifies the effective frequency of the driving force acting on the oscillator, and a resonant or near-resonant driving on the oscillator can be achieved. The displacement of the oscillator is then significantly enhanced due to the small detuning of the driving force and can exceed that of the zero-point fluctuation. This effect can be used to prepare quantum superpositions of macroscopically distinct coherent states in the oscillator. We present detailed studies on this state-generation scheme in both the closed- and open-system cases. This approach can be implemented in various experimental platforms, such as cavity- or circuit-QED systems, electromechanical systems, and spin-cantilever systems.