论文标题
基于线性光学元件的GHz型纠缠相干状态的纠缠浓度方案
Entanglement concentration protocols for GHZ-type entangled coherent state based on linear optics
论文作者
论文摘要
我们提出了两种纠缠浓度方案（ECP），以从相应的部分纠缠的GHz型ECS中获得最大纠缠的Greenberger-Horne-Horne-Zeilinger（GHz）型纠缠相干状态（ECS）。我们使用部分纠缠的GHz型EC获得了第一个ECP，该ECS辅助了单模相干状态，但是第二个ECP是使用两个部分纠缠的GHz型ECSS设计的。还针对ECP进行了计算和讨论成功概率。我们进一步比较了第一个ECP对3型GHz型EC的成功概率，其ECP为3模式W型ECS，发现我们的ECP对于状态参数的较大值（β= 0.7）的ECP更有效（最大成功概率）。为了实现物理实现，提供了两个光学电路（用于两个ECP），使用线性光学元件，即50:50梁分离器，相位变速器和光子检测器，这些探测器可支持当前技术的未来实验实现。
We proposed two entanglement concentration protocols (ECPs) to obtain maximally entangled Greenberger-Horne-Zeilinger (GHZ)-type entangled coherent state (ECS) from the corresponding partially entangled GHZ-type ECSs. We obtained the first ECP using a partially entangled GHZ-type ECS assisted with a superposition of single-mode coherent state, however the second ECP is designed using two copies of partially entangled GHZ-type ECSs. The success probabilities have also been calculated and discussed for both the ECPs. We have further compared the success probabilities of our first ECP for 3-mode GHZ-type ECS with an ECP of 3-mode W-type ECS and found that our ECP is more efficient (maximal success probabilities) for larger value (β=0.7) of state parameter. For the physical realization, two optical circuits (for two ECPs) using linear optical elements, viz 50:50 beam splitter, phase shifter, and photon detectors are provided, which support the future experimental implementation possible with the present technology.
