A Schrödinger-cat state is a coherent superposition of macroscopically distinguishable quantum states, in quantum optics usually realized as superposition of coherent states. Protocols to prepare photonic cats have been presented for atomic systems. Here we investigate in what manner and how well the preparation protocols can be transferred to a solid-state platform, namely, a semiconductor quantum-dot–cavity system. In quantum-dot–cavity systems there are many disruptive influences like cavity losses, the radiative decay of the quantum dot, and the coupling to longitudinal acoustic phonons. We show that for one of the protocols these influences kill the quantum coherence between the states forming the cat, while for a second protocol a parameter regime can be identified where the essential characteristics of Schrödinger-cat states survive the environmental influences under conditions that can be realized with current equipment.

中文翻译：

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量子点腔系统中的薛定ding猫态

Schrödinger-cat状态是宏观上可区分的量子状态的相干叠加，在量子光学中通常实现为相干态的叠加。已经提出了用于原子系统的制备光子猫的方案。在这里，我们研究了制备协议可以以何种方式以及如何良好地转移到固态平台上，即半导体量子点腔系统。在量子点-腔系统中，存在许多破坏性影响，例如空腔损耗，量子点的辐射衰减以及与纵向声子的耦合。我们证明，对于其中一种协议，这些影响会杀死形成猫的状态之间的量子相干性，