标题： 脉冲增强的固态量子发射器双光子干涉 显示英文标题

标题： Pulse-Enhanced Two-Photon Interference with Solid State Quantum Emitters

摘要： 纠缠远距离量子节点的能力对于构建量子网络和量子信息处理至关重要。 对于用作量子比特的固态量子发射器，可以通过光子干涉实现。 当发射器受到光谱扩散的影响时，这一过程可能变得非常低效，阻碍可扩展量子技术的实现。 我们研究了在两个独立量子发射器的Hong-Ou-Mandel（HOM）型实验背景下，两光子干涉的情况，这两个发射器相对于特定目标频率有不同的失谐。 我们评估了表征两个发射器之间光子不可区分性的二阶相干性。 我们发现，在没有控制协议的情况下，当两个失谐不同且光谱重叠减少时，两光子干涉操作效率较低，但可以通过在设定目标频率处周期性地施加$\pi$脉冲序列显著提高。 因此，尽管环境中有波动，通过所提出的脉冲序列和其他类似的外部控制协议，可以增强固态及其他受光谱扩散影响的量子发射器的光子不可区分性。 显示英文摘要

摘要： The ability to entangle distant quantum nodes is essential for the construction of quantum networks and for quantum information processing. For solid-state quantum emitters used as qubits, it can be achieved by photon interference. When the emitter is subject to spectral diffusion, this process can become highly inefficient, impeding the achievement of scalable quantum technologies. We study two-photon interference in the context of a Hong-Ou-Mandel (HOM)-type experiment for two separate quantum emitters, with different detunings with respect to a specific target frequency. We evaluate the second order coherences that characterize photon indistinguishability between the two emitters. We find that the two-photon interference operation that is inefficient in the absence of a control protocol, when the two detunings are different and spectral overlap is lessened, can be highly improved by a periodic sequence of $\pi$ pulses at a set target frequency. Photon indistinguishability in solid state and other quantum emitters subject to spectral diffusion can thus be enhanced by the proposed pulse sequence and similar external control protocols despite the fluctuations in the environment.