论文标题
量子点 - 腔体系统中的Schrödinger猫
Schrödinger cats in quantum-dot--cavity systems
论文作者
论文摘要
schrödinger-cat状态是宏观上可区分的量子状态的连贯叠加，在通常被视为相干状态的叠加的量子光学元件中。为原子系统提出了准备光子猫的方案。在这里，我们研究了准备方案的何种方式以及如何转移到固态平台，即半导体量子点 - 腔体系统。在量子点 - 腔体系中，有许多破坏性影响，例如腔损失，量子点的辐射衰减以及纯dephasing型耦合到纵向声音声子。我们表明，对于其中一种协议，这些影响杀死了形成猫的状态之间的量子相干性，而对于第二个协议，可以确定参数制度在现实条件下在施罗丁 - 猫态的基本特征中幸存下来的环境影响。
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 pure-dephasing type 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 realistic conditions.
