标题： 使用电信C波段量子点的高相干发射进行量子隐形传态 显示英文标题

标题： Quantum teleportation using highly coherent emission from telecom C-band quantum dots

摘要： 在量子网络中连接独立节点的一种实用方法是通过标准电信光纤网络发送光子。 这需要在1550纳米附近的电信波长带中具有亚泊松光子源，其中光子的相干时间必须足够长，以实现量子网络核心的基于干涉的技术。 在此，我们展示了一种在电信C波段发射的滴状外延InAs/InP量子点可以在非共振激发下提供相干时间超过1纳秒的光子，比在类似条件下短波长量子点报道的值长两倍以上。 我们证明这些相干时间可以实现与C波段激光量子比特的近最优干涉，其可见度仅受量子点多光子发射的限制。 使用纠缠光子，我们进一步展示了在六个不同基矢下对这类量子比特的量子态隐形传送，平均保真度达到88.3$\pm$4%。 除了在远距离量子通信中的直接应用外，这些量子点的高度相干性对于未来的基于自旋的电信量子网络应用具有前景。 显示英文摘要

摘要： A practical way to link separate nodes in quantum networks is to send photons over the standard telecom fibre network. This requires sub-Poissonian photon sources in the telecom wavelength band around 1550 nm, where the photon coherence time has to be sufficient to enable the many interference-based technologies at the heart of quantum networks. Here, we show that droplet epitaxy InAs/InP quantum dots emitting in the telecom C-band can provide photons with coherence times exceeding 1 ns even under non-resonant excitation, more than a factor two longer than values reported for shorter wavelength quantum dots under similar conditions. We demonstrate that these coherence times enable near-optimal interference with a C-band laser qubit, with visibilities only limited by the quantum dot multiphoton emission. Using entangled photons, we further show teleportation of such qubits in six different bases with average fidelity reaching 88.3$\pm$4%. Beyond direct applications in long-distance quantum communication, the high degree of coherence in these quantum dots is promising for future spin based telecom quantum network applications.