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arXiv 1202.5191quant-phcond-mat.supr-con
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共振腔量子电动力学中Dicke态的W型纠缠

Demonstrating W-type Entanglement of Dicke-States in Resonant Cavity Quantum Electrodynamics

Jonas A. Mlynek, Abdufarrukh A. Abdumalikov, Johannes M. Fink, Lars Steffen, Matthias Baur, Christian Lang, Arjan F. van Loo, Andreas Wallraff

发表信息：
Phys. Rev. A 86, 053838 (2012)
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摘要：

非线性和纠缠是物理系统非经典的两个重要特征。我们研究了多达N=3个两能级系统的共振相互作用的动力学和一个单一的模式的电磁场共享一个单一的激励动态。我们观察到相干真空拉比振荡和他们的非线性加速跟踪所有量子比特和谐振器的时间布居。我们使用量子态层析明确地表明，动力学产生最大纠缠态的W类在一个时间限制的集体相互作用率。我们使用一个纠缠见证和三角来表征的状态，其保真度F=78%是有限的，在我们的实验中的串扰产生的同时量子位操作，这是缺乏在一个顺序的方法与F= 91%。

英文摘要：

Nonlinearity and entanglement are two important properties by which physical systems can be identified as non-classical. We study the dynamics of the resonant interaction of up to N=3 two-level systems and a single mode of the electromagnetic field sharing a single excitation dynamically. We observe coherent vacuum Rabi oscillations and their nonlinear speed up by tracking the populations of all qubits and the resonator in time. We use quantum state tomography to show explicitly that the dynamics generates maximally entangled states of the W class in a time limited only by the collective interaction rate. We use an entanglement witness and the threetangle to characterize the state whose fidelity F=78% is limited in our experiments by crosstalk arising during the simultaneous qubit manipulations which is absent in a sequential approach with F=91%.

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