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Hao-Qing Zhang

Bio: Hao-Qing Zhang is an academic researcher from University of Science and Technology of China. The author has contributed to research in topics: Polarization (waves) & Fock space. The author has an hindex of 1, co-authored 2 publications receiving 5 citations.

Papers
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TL;DR: In this article, a scheme to realize the quantum walk with a single trapped ion was proposed, where the Fock states provided the walk space and the zero-phonon state served as its natural boundary.
Abstract: The quantum walk, as the quantum analog of the classical random walk, provides a feasible platform to study the topological phenomenon and nonequilibrium dynamics. Here we propose a scheme to realize the quantum walk with a single trapped ion where the Fock states provides the walk space and the zero-phonon state $|n=0\ensuremath{\rangle}$ serves as its natural boundary. Thus, our scheme offers an opportunity to investigate the dynamics of the bound states of the corresponding topological systems. In particular, the quench dynamics of the bound states can be extensively studied by tuning the bulk parameters and the local boundary operator, which are experimentally accessible. Our proposal not only offers an alternative approach to exploring the character of the bound states of the topological systems, but also offers a way to determine different phases through the dynamical processes.

5 citations

Journal ArticleDOI
TL;DR: In this paper , the authors reported the emergence of magnetic CP2 skyrmions in a realistic spin-1 model, which includes both dipole and quadrupole moments, opening a new road to discover emergent topological solitons in non-magnetic materials.
Abstract: Magnetic skyrmions are nanoscale topological textures that have been recently observed in different families of quantum magnets. These objects are called CP1 skyrmions because they are built from dipoles-the target manifold is the 1D complex projective space, CP1 ≅ S2. Here we report the emergence of magnetic CP2 skyrmions in a realistic spin-1 model, which includes both dipole and quadrupole moments. Unlike CP1 skyrmions, CP2 skyrmions can also arise as metastable textures of quantum paramagnets, opening a new road to discover emergent topological solitons in non-magnetic materials. The quantum phase diagram of the spin-1 model also includes magnetic field-induced CP2 skyrmion crystals that can be detected with regular momentum- (diffraction) and real-space (Lorentz transmission electron microscopy) experimental techniques.

3 citations

Patent
15 Nov 2019
TL;DR: In this article, a polarization beam splitter was proposed for the entire wavelength band from the ultraviolet to the near-infrared band, with the advantage of symmetry of input and output.
Abstract: The invention discloses a polarization beam splitter and a preparation method thereof, and a polarization beam splitting method, and the polarization beam splitter comprises two identical and symmetrically arranged Dove prisms having opposite bottoms, and a plurality of layers of optical films plated between the two Dove prisms and stacked in a staggered form of high and low refractive indexes, wherein incident light incident on a Dove prism parallel to the direction of the optical axis of the Dove prism can generate suppressed total internal reflection and film interference at the interface of the plurality of layers of optical films after being transmitted by the Dove prism to realize polarization splitting, and emergent light of s and p components is parallel output from the two Dove prisms, respectively. The invention realizes a high polarization extinction ratio of the entire wavelength band from the ultraviolet to the near-infrared band, has the advantage of symmetry of input andoutput, and can be applied to polarization optical fiber devices.

1 citations


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TL;DR: It is demonstrated that quantum walks are versatile systems that simulate many topological phases whose classifications are known for static Hamiltonians and not only provide a powerful tool as a quantum simulator for staticTopological phases but also give unique opportunity to study topological phenomena in driven systems.
Abstract: Discrete quantum walks are dynamical protocols for controlling a single quantum particle. Despite of its simplicity, quantum walks display rich topological phenomena and provide one of the simplest systems to study and understand topological phases. In this article, we review the physics of discrete quantum walks in one and two dimensions in light of topological phenomena and provide elementary explanations of topological phases and their physical consequence, namely the existence of boundary states. We demonstrate that quantum walks are versatile systems that simulate many topological phases whose classifications are known for static Hamiltonians. Furthermore, topological phenomena appearing in quantum walks go beyond what has been known in static systems; there are phenomena unique to quantum walks, being an example of periodically driven systems, that do not exist in static systems. Thus the quantum walks not only provide a powerful tool as a quantum simulator for static topological phases but also give unique opportunity to study topological phenomena in driven systems.

31 citations