Volume 131, Number 2, July 2020
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||24 August 2020|
Quadrupole topological phases in the zero-dimensional optical cavity
Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology - 100081, Beijing, China
Received: 17 March 2020
Accepted: 10 July 2020
The quadrupole topological insulator, which supports robust corner states, has been recently demonstrated in two-dimensional (2D) spatial lattices. Here, we design the first photonic quadrupole topological insulator in fully synthetic spaces with the utilization of 0D optical cavity. The frequency and orbital angular momentum (OAM) of light are used to form the 2D synthetic spaces. Four degenerate polarization states are mapped to the internal lattice sites within the unit cell. By suitably engineering the coupling between cavity modes with different frequencies, OAMs and polarizations, the ideal synthetic quadrupole topological insulator is obtained. By using the robust synthetic corner states, we present the possibility for the realization of topological transportation of multi-photon entangled states. Our designed synthetic photonic quadrupole insulator proposes a unique platform to investigate higher-order topological phases in lower-dimensional systems and possesses potential applications in quantum information and optical communication.
PACS: 42.60.Da – Resonators, cavities, amplifiers, arrays, and rings / 42.15.Eq – Optical system design / 73.90.+f – Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures (Restricted to new topics in section 73)
© 2020 EPLA
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