Entanglement creation in a quantum-dot-nanocavity system by Fourier-synthesized acoustic pulses
Entanglement creation in a quantum-dot-nanocavity system by Fourier-synthesized acoustic pulses
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DOI：
10.1103/physreva.89.012327
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发表时间：
2014-01-24
影响因子：
2.9
通讯作者：
Haenggi, Peter
中科院分区：
文献类型：
--
作者：
Blattmann, Ralf;Krenner, Hubert J.;Haenggi, Peter
我们探索了半导体量子点中激子二能级系统与光子晶体上定义的腔体纠缠的可能性，方法是通过扫描腔体频率跨越其与激子跃迁的共振。动态腔失谐是由射频表面声波（SAW）建立的。它诱导激子和光子自由度之间的朗道-齐纳跃迁，从而产生叠加态。我们通过使用定制的傅里叶合成SAW脉冲高达五个谐波优化该方案。理论研究进行了与amaster方程的方法，目前国家的最先进的设置。假设实验证明的系统参数，我们表明，组合脉冲增加最大纠缠和它的持久性。后者仅受主导失相机制的限制，即，光子从腔中损失。
We explore the possibility of entangling an excitonic two-level system in a semiconductor quantum dot with a cavity defined on a photonic crystal by sweeping the cavity frequency across its resonance with the exciton transition. The dynamic cavity detuning is established by a radio frequency surface acoustic wave (SAW). It induces Landau-Zener transitions between the excitonic and the photonic degrees of freedom and thereby creates a superposition state. We optimize this scheme by using tailored Fourier-synthesized SAW pulses with up to five harmonics. The theoretical study is performed with amaster equation approach for present state-of-the-art setups. Assuming experimentally demonstrated system parameters, we show that the composed pulses increase both the maximum entanglement and its persistence. The latter is only limited by the dominant dephasing mechanism, i.e., the photon loss from the cavity.