Unconditional preparation of nonclassical states via linear-and-quadratic optomechanics
Unconditional preparation of nonclassical states via linear-and-quadratic optomechanics
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DOI：
10.1103/physreva.98.063801
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发表时间：
2018-12-03
影响因子：
2.9
通讯作者：
Ferraro, Alessandro
中科院分区：
文献类型：
--
作者：
Brunelli, Matteo;Houhou, Oussama;Ferraro, Alessandro
储层工程使得能够在噪声环境中稳健且无条件地制备纯量子态。我们展示了如何一个家庭的非经典状态的机械振荡器可以稳定在一个腔中，是参数耦合到机械位移和位移的平方。谐振腔由三个音调驱动，分别位于红色边带、谐振腔谐振和第二个蓝色边带。这样稳定的状态是有限数量声子的叠加（压缩和位移）。它们显示了包含玻色子系统的两个非经典原型的独特特征：通过调整驱动的强度，人们实际上可以从单声子状态移动到薛定谔猫状态。该方案是确定性的，取代了测量和反馈回路的需要，并且不需要将振荡器初始化到基态。
Reservoir engineering enables the robust and unconditional preparation of pure quantum states in noisy environments. We show how a family of nonclassical states of a mechanical oscillator can be stabilized in a cavity that is parametrically coupled to both the mechanical displacement and the displacement squared. The cavity is driven with three tones, on the red sideband, on the cavity resonance, and on the second blue sideband. The states so stabilized are (squeezed and displaced) superpositions of a finite number of phonons. They show the unique feature of encompassing two prototypes of nonclassicality for bosonic systems: by adjusting the strength of the drives, one can in fact move from a single-phonon- to a Schrodinger-cat-like state. The scheme is deterministic, supersedes the need for measurement-and-feedback loops, and does not require initialization of the oscillator to the ground state.