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arXiv 1406.6933cond-mat.mes-hallphysics.optics
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量子点分子中的三体混合纠缠

Towards Tripartite Hybrid Entanglement in Quantum Dot Molecules

M. Khoshnegar, A. Jafari-Salim, M. H. Ansari, A. H. Majedi

摘要:

在越来越多的物质量子比特和光子量子比特之间建立混合纠缠是实现可扩展量子计算和长距离量子通信的必要条件。在这里,我们证明了在强关联量子点分子中形成的带电激子复合物能够在适当的载流子量子化下产生三重杂化纠缠。分子的混合轨道构成多级基态,具有亚meV的空穴隧穿能和相对较大的电子杂化能。我们发现,适当的尺寸和interdot间距保持电子粒子弱本地化,开放额外的复合通道,通过相关的基态激子。这允许产生更高阶的纠缠态。非平凡的空穴隧穿能量,由多粒子相互作用重整化,有利于实现仅在分子光谱的某些组分之间的能量重合。这转化为在多体激子复合物中出现有利的光谱分量,其在整个电场诱导的空穴隧穿过程中维持主振子强度。我们特别分析了是否可以操纵有利的自旋组态的能级加宽来消除光子的可分辨性。

英文摘要:

Establishing the hybrid entanglement among a growing number of matter and photonic quantum bits is necessary for the scalable quantum computation and long distance quantum communication. Here we demonstrate that charged excitonic complexes forming in strongly correlated quantum dot molecules are able to generate tripartite hybrid entanglement under proper carrier quantization. The mixed orbitals of the molecule construct multilevel ground states with sub-meV hole tunneling energy and relatively large electron hybridization energy. We show that appropriate size and interdot spacing maintains the electron particle weakly localized, opening extra recombination channels by correlating ground-state excitons. This allows for creation of higher order entangled states. Nontrivial hole tunneling energy, renormalized by the multi-particle interactions, facilitates realizing the energy coincidence among only certain components of the molecule optical spectrum. This translates to the emergence of favorable spectral components in a multi-body excitonic complex which sustain principal oscillator strengths throughout the electric-field-induced hole tunneling process. We particularly analyse whether the level broadening of favorable spin configurations could be manipulated to eliminate the distinguishability of photons.

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