论文标题
通过分解主方程动力学，分析固态旋转矩之间的光子计数纠缠生成
Analyzing photon-count heralded entanglement generation between solid-state spin qubits by decomposing the master equation dynamics
论文作者
论文摘要
我们分析和比较了三种不同的方案，这些方案可用于在光学活跃的单固态量子系统中生成旋转矩阵之间的纠缠。每个方案都是基于首先生成自由度自由度与光子数，时箱或系统发出的光子自由度极化程度之间的纠缠。我们通过将Markovian主方程的动力学分解为以累积检测器光子计数为条件的一组传播超级操作器来计算纠缠生成过程的时间演变。然后，我们使用条件密度算子解决方案来计算最终自旋旋转状态的效率和忠诚度，同时考虑自旋反应，光学纯dephasing，光谱扩散，光子丢失，相位误差，检测器暗计和检测器光子数量分辨率限制。我们发现，每种方案的保真度的限制受到每个源的光子的平均波袋重叠的限制，但是每个方案的这些边界都不同。我们还比较了每个方案的性能，这是自旋Qubits之间的距离的函数。
We analyze and compare three different schemes that can be used to generate entanglement between spin qubits in optically-active single solid-state quantum systems. Each scheme is based on first generating entanglement between the spin degree of freedom and either the photon number, the time bin, or the polarization degree of freedom of photons emitted by the systems. We compute the time evolution of the entanglement generation process by decomposing the dynamics of a Markovian master equation into a set of propagation superoperators conditioned on the cumulative detector photon count. We then use the conditional density operator solutions to compute the efficiency and fidelity of the final spin-spin entangled state while accounting for spin decoherence, optical pure dephasing, spectral diffusion, photon loss, phase errors, detector dark counts, and detector photon number resolution limitations. We find that the limit to fidelity for each scheme is restricted by the mean wavepacket overlap of photons from each source, but that these bounds are different for each scheme. We also compare the performance of each scheme as a function of the distance between spin qubits.
