Shooter Ginny, Xiang Zi-Heng, Müller Jonathan R A, Skiba-Szymanska Joanna, Huwer Jan, Griffiths Jonathan, Mitchell Thomas, Anderson Matthew, Müller Tina, Krysa Andrey B, Mark Stevenson R, Heffernan Jon, Ritchie David A, Shields Andrew J
Opt Express. 2020 Nov 23;28(24):36838-36848. doi: 10.1364/OE.405466.
Quantum networks are essential for realising distributed quantum computation and quantum communication. Entangled photons are a key resource, with applications such as quantum key distribution, quantum relays, and quantum repeaters. All components integrated in a quantum network must be synchronised and therefore comply with a certain clock frequency. In quantum key distribution, the most mature technology, clock rates have reached and exceeded 1GHz. Here we show the first electrically pulsed sub-Poissonian entangled photon source compatible with existing fiber networks operating at this clock rate. The entangled LED is based on InAs/InP quantum dots emitting in the main telecom window, with a multi-photon probability of less than 10% per emission cycle and a maximum entanglement fidelity of 89%. We use this device to demonstrate GHz clocked distribution of entangled qubits over an installed fiber network between two points 4.6km apart.
量子网络对于实现分布式量子计算和量子通信至关重要。纠缠光子是一种关键资源，可应用于量子密钥分发、量子中继器和量子重复器等领域。集成在量子网络中的所有组件必须同步，因此要符合一定的时钟频率。在最成熟的量子密钥分发技术中，时钟速率已达到并超过1GHz。在此，我们展示了首个与以该时钟速率运行的现有光纤网络兼容的电脉冲亚泊松纠缠光子源。该纠缠发光二极管基于在主要电信窗口发射的InAs/InP量子点，每个发射周期的多光子概率小于10%，最大纠缠保真度为89%。我们使用该设备在相距4.6公里的两点之间的已安装光纤网络上演示了千兆赫兹时钟控制的纠缠量子比特分发。
