论文标题
高阻抗微波模式的量子浴工程通过准粒子隧道
Quantum bath engineering of a high impedance microwave mode through quasiparticle tunneling
论文作者
论文摘要
我们在微波量子光学器件中展示了一种新的耗散工程方法。对于单个模式，耗散通常对应于量子跳跃，其中光子逐一丢失。在这里，我们能够用简单的直流电压调整每次跳跃损失的光子的最小数量为两个（或更多）。结果，不同的量子状态经历了不同的耗散。因果关系意味着国家还必须经历不同的能量转移。我们对这些羔羊转移的测量与高度非线性浴偶联体制中的Kramers-Kronig关系的预测非常吻合。这项工作为电路QED中的量子状态操纵开辟了新的可能性，而无需依赖约瑟夫森效应。
We demonstrate a new approach to dissipation engineering in microwave quantum optics. For a single mode, dissipation usually corresponds to quantum jumps, where photons are lost one by one. Here, we are able to tune the minimal number of lost photons per jump to be two (or more) with a simple dc voltage. As a consequence, different quantum states experience different dissipation. Causality implies that the states must also experience different energy shifts. Our measurements of these Lamb shifts are in good agreement with the predictions of the Kramers-Kronig relations for single quantum states in a regime of highly non-linear bath coupling. This work opens new possibilities for quantum state manipulation in circuit QED, without relying on the Josephson effect.
