A two-fold quantum delayed-choice experiment in a superconducting circuit
Abstract
We propose and experimentally demonstrate a two-fold quantum delayed-choice experiment where wave or particle nature of a superconducting interfering device can be post-selected twice after the interferometer. The wave-particle complementarity is controlled by a quantum which-path detector (WPD) in a superposition of its on and off states implemented through a superconducting cavity. The WPD projected to its on state records which-path information, which manifests the particle nature and destroys the interference associated with wave nature of the system. In our experiment, we can recover the interference signal through a quantum eraser even if the WPD has selected out the particle nature in the first round of delayed-choice detection, showing that a quantum WPD adds further unprecedented controllability to test of wave-particle complementarity through the peculiar quantum delayed-choice measurements.
Keywords
Cite
@article{arxiv.1608.04908,
title = {A two-fold quantum delayed-choice experiment in a superconducting circuit},
author = {K. Liu and Y. Xu and W. Wang and Shi-Biao Zheng and Tanay Roy and Suman Kundu and Madhavi Chand and A. Ranadive and R. Vijay and Y. P. Song and L. -M. Duan and L. Sun},
journal= {arXiv preprint arXiv:1608.04908},
year = {2017}
}