A twofold quantum delayed-choice experiment in a superconducting circuit.
A twofold quantum delayed-choice experiment in a superconducting circuit.
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超导电路中的双重量子延迟选择实验
DOI：
10.1126/sciadv.1603159
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发表时间：
2017-05
期刊：
影响因子：
13.6
通讯作者：
Sun L
中科院分区：
文献类型：
--
作者：
Liu K;Xu Y;Wang W;Zheng SB;Roy T;Kundu S;Chand M;Ranadive A;Vijay R;Song Y;Duan L;Sun L
进行了双重延迟选择实验，其中量子系统的行为被后验选择两次。波粒互补性是量子力学的核心。为了说明这一神秘的特征，惠勒提出了延迟选择实验，在这个实验中，量子系统表现出波或粒子的属性，这取决于系统进入干涉仪后的实验安排。在最近的量子延迟选择实验中，这两种互补的行为在封闭和开放的叠加中被量子干涉仪同时观察到。我们建议并实施了一个概念上不同的量子延迟选择实验，通过引入一个可以同时记录和忽略系统的路径信息的路径检测器（WPD），但干涉仪本身是经典的。我们的实验是用超导电路实现的，其中腔作为干扰量子位的WPD。使用这种设置，我们实现了第一个双重延迟选择实验，这表明系统的行为不仅取决于测量设备的配置，即使在系统被检测到之后也可以选择，而且还取决于我们是否后验擦除或标记哪个路径信息，后者不能通过以前的量子延迟选择实验来揭示。我们的研究结果代表了第一次演示这两个违反直觉的功能与相同的实验设置，显着扩展了量子延迟选择实验的概念。
A twofold delayed-choice experiment was performed, where the behavior of a quantum system was a posteriori chosen twice. Wave-particle complementarity lies at the heart of quantum mechanics. To illustrate this mysterious feature, Wheeler proposed the delayed-choice experiment, where a quantum system manifests the wave- or particle-like attribute, depending on the experimental arrangement, which is made after the system has entered the interferometer. In recent quantum delayed-choice experiments, these two complementary behaviors were simultaneously observed with a quantum interferometer in a superposition of being closed and open. We suggest and implement a conceptually different quantum delayed-choice experiment by introducing a which-path detector (WPD) that can simultaneously record and neglect the system’s path information, but where the interferometer itself is classical. Our experiment is realized with a superconducting circuit, where a cavity acts as the WPD for an interfering qubit. Using this setup, we implement the first twofold delayed-choice experiment, which demonstrates that the system’s behavior depends not only on the measuring device’s configuration that can be chosen even after the system has been detected but also on whether we a posteriori erase or mark the which-path information, the latter of which cannot be revealed by previous quantum delayed-choice experiments. Our results represent the first demonstration of both counterintuitive features with the same experimental setup, significantly extending the concept of quantum delayed-choice experiment.