Quantum teleportation using coherent emission from telecom C-band quantum dots
Quantum teleportation using coherent emission from telecom C-band quantum dots
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DOI：
10.1364/qim.2019.s2a.4
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
M. Anderson;T. Müller;J. Huwer;J. Skiba-Szymanska;A. Krysa;R. Stevenson;J. Heffernan;D. A. Ritchie
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文献类型：
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作者：
M. Anderson;T. Müller;J. Huwer;J. Skiba-Szymanska;A. Krysa;R. Stevenson;J. Heffernan;D. A. Ritchie
在量子网络中连接不同节点的一种实用方法是通过标准的电信光纤网络发送光子。这需要在1550 nm左右的电信波段中的亚泊松光子源，其中光子相干时间必须足以实现量子网络核心的许多基于干涉的技术。在这里，我们表明，液滴外延InAs/InP量子点在电信C波段发射可以提供光子的相干时间超过1纳秒，即使在非共振激发下，超过一个因素两个更长的值比短波长量子点在类似条件下报告。我们证明，这些相干时间使接近最佳的干扰与C波段激光量子比特，与vibration仅限于量子点多光子发射。利用纠缠光子，我们进一步展示了这种量子比特在六种不同的基础上的隐形传态，平均保真度达到88.34%。除了在长距离量子通信中的直接应用之外，这些量子点中的高度相干性对于未来基于自旋的电信量子网络应用是有希望的。
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.