A generalised multipath delayed-choice experiment on a large-scale quantum nanophotonic chip

• URL: http://arxiv.org/abs/2105.05580v1
• Date: Wed, 12 May 2021 10:58:35 GMT
• Title: A generalised multipath delayed-choice experiment on a large-scale quantum nanophotonic chip
• Authors: Xiaojiong Chen, Yaohao Deng, Shuheng Liu, Tanumoy Pramanik, Jun Mao, Jueming Bao, Chonghao Zhai, Tianxiang Dai, Huihong Yuan, Jiajie Guo, Shao-Ming Fei, Marcus Huber, Bo Tang, Yan Yang, Zhihua Li, Qiongyi He, Qihuang Gong, Jianwei Wang
• Abstract summary: Famous double-slit or doublepath experiments have confirmed the dual nature of quantum matter. A quantum controlled version of delayed-choice was proposed by Ionicioiu and Terno.
• Score: 7.960730435409329
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Famous double-slit or double-path experiments, implemented in a Young's or Mach-Zehnder interferometer, have confirmed the dual nature of quantum matter, When a stream of photons, neutrons, atoms, or molecules, passes through two slits, either wave-like interference fringes build up on a screen, or particle-like which-path distribution can be ascertained. These quantum objects exhibit both wave and particle properties but exclusively, depending on the way they are measured. In an equivalent Mach-Zehnder configuration, the object displays either wave or particle nature in the presence or absence of a beamsplitter, respectively, that represents the choice of which-measurement. Wheeler further proposed a gedanken experiment, in which the choice of which-measurement is delayed, i.e. determined after the object has already entered the interferometer, so as to exclude the possibility of predicting which-measurement it will confront. The delayed-choice experiments have enabled significant demonstrations of genuine two-path duality of different quantum objects. Recently, a quantum controlled version of delayed-choice was proposed by Ionicioiu and Terno, by introducing a quantum-controlled beamsplitter that is in a coherent superposition of presence and absence. It represents a controllable experiment platform that can not only reveal wave and particle characters, but also their superposition. Moreover, a quantitative description of two-slit duality relation was initialized in Wootters and Zurek's seminal work and formalized by Greenberger,et. al. as D2+V2<=1, where D is the distinguishability of whichpath information, and V is the contrast visibility of interference. In this regard, getting which-path information exclusively reduces the interference visibility, and vice versa. This double-path duality relation has been tested in pioneer experiments and recently in delayed-choice measurements.

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