Experimental Demonstration of Topological Charge Protection in Wigner Current

Bibliographic Details
Title: Experimental Demonstration of Topological Charge Protection in Wigner Current
Authors: Chen, Yi-Ru, Hsieh, Hsien-Yi, Ning, Jingyu, Wu, Hsun-Chung, Chen, Hua Li, Chuang, You-Lin, Yang, Popo, Steuernagel, Ole, Wu, Chien-Ming, Lee, Ray-Kuang
Publication Year: 2021
Collection: Quantum Physics
Subject Terms: Quantum Physics
More Details: We experimentally reconstruct Wigner's current of quantum phase space dynamics for the first time. We reveal the ``push-and-pull" associated with damping and diffusion due to the coupling of a squeezed vacuum state to its environment. In contrast to classical dynamics, where (at zero temperature) dissipation only ``pulls" the system toward the origin of phase space, we also observe an outward ``push" because our system has to obey Heisenberg's uncertainty relations. With squeezed vacuum states generated by an optical parametric oscillator at variable pumping levels, we identify the pure squeezing dynamics and its central stagnation point with a topological charge of `$-1$'. We experimentally verify that this charge is protected for weakly as well as strongly decohering conditions. This work demonstrates high resolving power and establishes an experimental paradigm for measuring quantumness and non-classicality of the dynamics of open quantum systems.
Comment: 8 pages, 4 figures
Document Type: Working Paper
Access URL: http://arxiv.org/abs/2111.08285
Accession Number: edsarx.2111.08285
Database: arXiv
More Details
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