一种基于非弹性库珀对隧穿的按需亮反聚束微波光子源
A bright on-demand source of anti-bunched microwave photons based on inelastic Cooper pair tunneling
摘要：
产生单光子的能力不仅是科学探索的普遍工具，其应用范围从光谱学和计量学到量子计算，而且也是物理过程的潜在量子性质的重要证明。在微波体制中，反聚束辐射的发射到目前为止依赖于约瑟夫森量子比特的相干控制，其中需要精确校准的微波脉冲，并且可实现的带宽受到量子比特的非谐性的限制。在这里，我们展示了一个明亮的按需量子微波辐射源的操作能够发射反聚束光子的基础上非弹性库珀对隧穿和驱动一个简单的直流电压偏置。它的特点是它的归一化二阶相关函数的$g^{(2)}(0)\approx0.43$对应于反聚束在单光子制度。我们的源可以被触发，其发射速率是可调的，超过目前的微波单光子源获得的速率超过一个数量级。
英文摘要：
The ability to generate single photons is not only an ubiquitous tool for scientific exploration with applications ranging from spectroscopy and metrology to quantum computing, but also an important proof of the underlying quantum nature of a physical process. In the microwave regime, emission of anti-bunched radiation has so far relied on coherent control of Josephson qubits, where precisely calibrated microwave pulses are needed, and the achievable bandwidth is limited by the anharmonicity of the qubit. Here, we demonstrate the operation of a bright on-demand source of quantum microwave radiation capable of emitting anti-bunched photons based on inelastic Cooper pair tunneling and driven by a simple DC voltage bias. It is characterized by its normalized second order correlation function of $g^{(2)}(0)\approx0.43$ corresponding to anti-bunching in the single photon regime. Our source can be triggered and its emission rate is tunable in situ exceeding rates obtained with current microwave single photon sources by more than one order of magnitude.
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