Experimental demonstration of input-output indefiniteness in a single quantum device

• URL: http://arxiv.org/abs/2210.17046v2
• Date: Sun, 14 Apr 2024 14:56:46 GMT
• Title: Experimental demonstration of input-output indefiniteness in a single quantum device
• Authors: Yu Guo, Zixuan Liu, Hao Tang, Xiao-Min Hu, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Giulio Chiribella,
• Abstract summary: We introduce a theoretical method to witness input-output indefiniteness in a single quantum device. We experimentally demonstrate it by constructing a photonic setup that exhibits input-output indefiniteness with a statistical significance exceeding 69 standard deviations.
• Score: 9.23924733517501
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum theory allows information to flow through a single device in a coherent superposition of two opposite directions, resulting into situations where the input-output direction is indefinite. Here we introduce a theoretical method to witness input-output indefiniteness in a single quantum device, and we experimentally demonstrate it by constructing a photonic setup that exhibits input-output indefiniteness with a statistical significance exceeding 69 standard deviations. Our results provide a way to characterize input-output indefiniteness as a resource for quantum information and photonic quantum technologies and enable table-top simulations of hypothetical scenarios exhibiting quantum indefiniteness in the direction of time.

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