论文标题
使用DC偏见的Josephson连接产生两个连续的纠缠微波梁
Generating two continuous entangled microwave beams using a dc-biased Josephson junction
论文作者
论文摘要
我们在实验上表明，DC偏向的Josephson连接在串联的连接中，两个微波谐振器散发出从谐振器中泄漏出的微波束。在没有固定相参考以表征传出梁的纠缠的情况下，我们测量二阶相干函数，以证明纠缠速度为每秒25亿个光子对的发射率。实验结果在与理论的定量一致性中发现，证明直流偏置的低频噪声是纠缠束相干时间的主要限制。该协议使我们能够评估谐振器的纠缠的熵，并确定可以使该设备更接近量子技术应用的有用的纠缠微波的明亮来源的改进。
We show experimentally that a dc-biased Josephson junction in series with two microwave resonators emits entangled beams of microwaves leaking out of the resonators. In the absence of a stationary phase reference for characterizing the entanglement of the outgoing beams, we measure second-order coherence functions for proving entanglement up to an emission rate of 2.5 billion photon pairs per second. The experimental results are found in quantitative agreement with theory, proving that the low frequency noise of the dc bias is the main limitation for the coherence time of the entangled beams. This agreement allows us to evaluate the entropy of entanglement of the resonators, and to identify the improvements that could bring this device closer to a useful bright source of entangled microwaves for quantum-technological applications.
