通过环境选择实验实现纠缠滤波器
Experimental realization of an entanglement filter through the environmental selection
摘要：
我们报告了一个实验，使用环境选择，在最近的量子达尔文主义理论的一个关键概念，作为一种机制，以实现纠缠过滤器，一个有用的量子信息设备，过滤掉某些纠缠态。在实验中，两个量子比特的环境被控制为有利于纠缠态，并杀死输入态中的其他竞争成分。初始态的纠缠消失，但与环境相互作用后幸存的状态接近最大纠缠态，通过量子态层析测量的纠缠保真度为$(94.7\pm 1.9)%$。实验证明，所产生的纠缠在初始态结构和环境参数变化的情况下是鲁棒的。
英文摘要：
We report an experiment that uses the environmental selection, a key concept in the recent theory of quantum Darwinism, as a mechanism to realize the entanglement filter, a useful quantum information device that filters out certain entangled states. In the experiment, the environment of two qubits is controlled to favor an entangled state and kill other competing components in the input state. The initial state has vanishing entanglement, but the state surviving after interaction with the environment is close to a maximally entangled state, with an entanglement fidelity of $(94.7\pm 1.9)%$ measured through the quantum state tomography. We experimentally demonstrate that the generated entanglement is robust under change of the initial state configurations and the environmental parameters.
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