论文标题
与超导电路对微波脉冲的无相互作用检测
Coherent interaction-free detection of microwave pulses with a superconducting circuit
论文作者
论文摘要
无相互作用的测量是一种基本量子效应，因此，在没有不可逆的光子吸收的情况下确定光敏物体的存在。在这里，我们提出了连贯的无相互作用检测的概念，并使用三级超导Transmon电路实验证明了它。与标准的无相互作用测量设置相反，动态涉及一系列投影操作，我们的协议采用了完全连贯的演化，令人惊讶地导致成功的可能性。我们表明，可以通过第二次转换来确定微波脉冲谐振剂的存在，同时避免将设备刺激到第三级。在实验上，这是通过使用一系列的Ramsey微波脉冲来完成的，该脉冲耦合到第一个过渡并监测地面种群。
The interaction-free measurement is a fundamental quantum effect whereby the presence of a photosensitive object is determined without irreversible photon absorption. Here we propose the concept of coherent interaction-free detection and demonstrate it experimentally using a three-level superconducting transmon circuit. In contrast to standard interaction-free measurement setups, where the dynamics involves a series of projection operations, our protocol employs a fully coherent evolution that results, surprisingly, in a higher probability of success. We show that it is possible to ascertain the presence of a microwave pulse resonant with the second transition of the transmon, while at the same time avoid exciting the device onto the third level. Experimentally, this is done by using a series of Ramsey microwave pulses coupled into the first transition and monitoring the ground-state population.
