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arXiv 1807.06178quant-ph
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三个阻尼驱动量子比特的二分和三分纠缠

Bipartite and Tripartite Entanglement for Three Damped Driven Qubits

William Konyk, Ethan Stanifer, Habtom Woldekristos, James Clemens, Perry Rice

摘要:

我们研究了开放量子系统中的两体纠缠和三体纠缠,特别是三个量子比特,所有的量子比特都是阻尼的,其中一个是驱动的。我们采用了一种系统的方法来计算各种二分分裂的纠缠,使用广义并发作为纠缠的指标。我们的计算是基于一个直接的检测方案,这是一个特定的解开的密度矩阵。该系统具有耦合原子的集体偶极-偶极能移,耗散是通过Lehmberg-Agarwal主方程描述的部分集体自发发射实现的.我们的结果是解开依赖的,但适用于基于直接探测的纠缠应用.我们还计算了该系统的三向纠缠或剩余纠缠。我们提出了各种驱动和阻尼率的计算,并检查什么样的衰减率是足够的系统被减少到两个量子位与读出端口。我们还考虑了一个特定的模型,三个原子位于自由空间中的特定位置。

英文摘要:

We investigate bipartite and tripartite entanglement in an open quantum system, specifically three qubits, all of which are damped, and one of which is driven. We adapt a systematic approach in calculating the entanglement of various bipartite splits usinga generalized concurrence as an indicator of entanglement. Our calculations are based on a direct detection scheme that is a particular unravelling of the density matrix. This system has a collective dipole-dipole energy shift that couples the atoms and the dissipation is via partially collective spontaneous emission described by the Lehmberg-Agarwal master equation.Our results are unravelling dependent, but apply to applications of entanglement based on direct detection. We also calculate the three-way tangle or residual entanglement for this system. We present calculations for a variety of driving and damping rates, and examine what decay rate is adequate for the system to be reduced to two qubits with a readout port. We also consider a specific model of three atoms located at particular positions in free space.

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