Entanglement concentration of unknown states via the quantum dot plus double-sided cavity system
Entanglement concentration of unknown states via the quantum dot plus double-sided cavity system
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DOI：
10.1088/1612-2011/12/11/115204
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发表时间：
2015-10
影响因子：
1.7
通讯作者：
Xiao-Jie Yuan;Ming Yang;Ping Dong;Z. Cao
中科院分区：
文献类型：
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作者：
Xiao-Jie Yuan;Ming Yang;Ping Dong;Z. Cao
在这封信中，我们提出了一种在输入光子的帮助下，通过量子点(QD)+双面腔系统中的纠缠交换来实现纠缠浓缩的方案。利用我们的方案，可以在没有直接相互作用和初始纠缠的情况下，产生两个空间分离的粒子之间的二体最大纠缠态。此外，还可以产生四粒子最大纠缠态。与以往研究QD系统中纠缠浓度的工作不同，对于我们来说，被浓缩的非最大纠缠态是未知的；此外，纠缠交换的复杂的Bell态测量被单光子检测所取代，这将大大降低当前方案的实现复杂度。
In this letter we propose a scheme of entanglement concentration via entanglement swapping in the quantum dot (QD) plus double-sided cavity system with the help of an input photon. With our scheme, bipartite maximally entangled states among two spatially separated particles can be generated without direct interaction and initial entanglement. Moreover, four-particle maximally entangled states can be created too. Contrary to previous work investigating entanglement concentration in QD systems, the non-maximally entangled state to be concentrated can be unknown for us; furthermore, the complicated Bell-state measurement of entanglement swapping is replaced by single-photon detection, which will greatly reduce the realisation complexity of the current scheme.